==================================================================== ==================================================================== Oregon State University COAS SST Image Archive last readme update: May 14, 2007 This archive contains AVHRR Sea Surface Temperature images, beginning in January of 1992 and extending to the present. Images in this ftp directory may be browsed using http://coho.coas.oregonstate.edu Contents of This Text File ~~~~~~~~~~~~~~~~~~~~~~~~~~ I. Scenes from Individual Satellite Passes 1. Information applying to all images 2. Globec NE Pacific Images from January 1992 to present a.1 km resolution California Current Region Images from multi-channel algorithms: Jan 1, 1992-present b.1 km resolution Gulf of Alaska Images from multi-channel algorithms: Aug 25,2000 - June 30, 2005 c.1 km resolution Gulf of Alaska Images from channel 4 only: Aug 25,2000 - June 30, 2005 d.3 km resolution California Current Region images from AVHRR channel 4 only: Jan 1,1992-July 1, 2005 e.1 km resolution California Current Region Images from AVHRR channel 4 only: Nov.1,1997-Mar 17,1998 3. EBC California Current images from July 1992 to October 1997 II. Pathfinder AVHRR 9 day Composites for 1997-2003 III. SeaWiFs Ocean Color Daily Composite Images Sept 1997 - Dec. 2005. 1. Information applying to all images 2. Globec NE Pacific Color Images from September 1997 to 2005 a.California Curent region b.Gulf of Alaska region IV. Using Anonymous FTP to obtain images ______________________________________________________________________________ ============================================================================== I. Scenes from Individual Satellite Passes ============================================================================== ______________________________________________________________________________ ______________________________________________________________________________ 1. Information applying to all images ______________________________________________________________________________ The following applies to all AVHRR images which are archived at this site: All Images from dates earlier than July 1, 2005 have been processed and navigated by Ocean Imaging of Solana Beach, CA Images dated July 1, 2005 and later are generously provided by Dave Foley of NOAA Pacific Fisheries Environmental Laboratory. You can access this data in other formats at http://coastwatch.pfel.noaa.gov/ Images consist of byte array data which can be mapped to temperature. (Byte values range from 0 to 255). Archived images are compressed using standard Unix ".Z" compression. To indicate this, filenames will have .Z as their final characters. To use these files, you will need software that can uncompress .Z files and software that allows you to display byte arrays as images. (Compress/uncompress software for MS-Dos is available for anonymous ftp under directory /ebc/msdos) Images are mapped to a simple rectangular grid, so each pixel represents a constant area in degrees longitude and latitude. The images begin in the northwest corner and are stored top down. Element (1,1) is the north west corner, element (1,512) is the north east corner, element (512,1) is south west and (512,512) is south east. There are usually 2 AVHRR satellites passing over the west coast of N. America, making available 2 - 4 images per day for any given area. After July 1, 2005, more than 3-4 images may be present since any data capture with data in the area of interest is included. For the old-style EBC California current images described under 3., only images which were judged to contain useful cloud-free areas are archived; rarely do all images from a given day meet this criterion. For images dated earler than July 1, 2005: When the coast is visible, Ocean Imaging is supposed to be correcting the navigation to within 1 pixel using known coastal points, although some of the images have larger errors. These are often cloudy or foggy near the coast, making an exact determination of the coast location difficult. ______________________________________________________________________________ 2. Globec NE Pacific Images from January 1992-the present ______________________________________________________________________________ These images are being collected and archived for use in the US GLOBEC NE Pacific program. They are stored under /ebc/globec The completed archive will have data for all days from Jan. 1, 1992 to the present. For the California Current region, there is data for all years beginning in January of 1992. Archived images exist for 2 large areas of the California Current region in the Pacific off of North America which are processed with multi-channel algorithms. The images are temperature-corrected and cloud masks are available. NOAA-14 & NOAA-16 images are processed with the Pathfinder SST algorithm. NOAA-12 images are processed using the Coastwatch split window algortihm which uses channels 4 & 5 of the AVHRR sensor. For a number of reasons, NOAA-12 passes are generally of lower quality than NOAA-14 passes. Images are stored under /ebc/globec/south and /ebc/globec/north. We have archived images of an additional area of the NE Pacific California Current region. This area is approximately midway betwen the north and south region - it covers ~25N-55N. These images are smaller (1024 x 1024 pixels), with a reduced resolution of 0.03 degrees lat/lon per pixel. They are from channel 4 of the AVHRR only and no temperature-correction has been applied. A cloud mask from the multi-channel algorithm is provided for these images when it is available. For the Gulf of Alsaka region, there is data beginning August 25, 2000 and extending to June 30, 2005. We do not anticipate expanding the historical archive of the Gulf of Alsaka region data, Archived images exist for 2 large areas of the Gulf of Alaska area in the Pacific off of North America which are processed with multi-channel algorithms. The images are temperature-corrected and cloud masks are available. NOAA-14 & NOAA-16 images are processed with the Pathfinder SST algorithm. NOAA-12 images are processed using the Coastwatch split window algortihm which uses channels 4 & 5 of the AVHRR sensor. For a number of reasons, NOAA-12 passes are generally of lower quality than NOAA-14 passes. Images are stored under /ebc/globec/goaeast and /ebc/globec/goawest. Additionally, images of the same Gulf of Alsaka areas at ~1km resolution from AVHRR channel 4 only are stored in /ebc/globec/goaeastch4 and /ebc/globec/goawestch4. All cloud masks are provided by Ocean Imaging or NOAA PFEL and are obtained using multi-channel cloud-masking algorithms and not from direct observation of the images. Our initial evaluation of these cloud masks suggests that they do not always accurately identify either cloud-free or cloudy areas of the images. For images before July 1, 2005, the estimate of the amount of cloud-free waters given in the filename of each image is taken directly from the cloud mask provided. Both the cloud mask and the estimate of cloud-free water should therefore not be taken as true measures of the quality of an image. No estimate of cloud-free ocean is provided for images after July 1, 2005. For November 1997 - March 17, 1998, archived images of the 2 large areas off the Pacific coast of N. America obtained using channel 4 AVHRR data only. These images are not temperature-corrected nor cloud-masked. They are stored under /ebc/globec/ch4/south and /ebc/globec/ch4/north. a. California Current Images from multi-channel algorithms: Jan 1,1992-present ------------------------------------------------------------ /ebc/globec/south ================ Images stored under this directory are of a large region off the southern North American west coast. They are mapped to a rectangular grid with corners: bottom right: ( 18.76N, 106.70W) top left: (39.23N, 132.29W ) and the images are 2560 (samples) x 2048 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). The byte value (goes from 0 - 255) in these images represents 10. x (approx sea surface temp in degrees C - 7.0 ) and covers the range 7. - 32.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/south ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY YYc - cloud masks for images in /ebc/globec/south/YY where YY represents the last 2 digits of the year. Image names consist of sYYDDDZZ_ABCD_SSS.gbc(_u).Z, where s indicates this is the more southern of the 2 regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8-0.9 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: sYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" For example, /ebc/globec/south/98/s9808210_3523_n14.gbc.Z is an image of the southern region from GMT hour 10 of the 82nd day (Mar 23) of 1998. Region A has about 0.3 (30-39%) cloud-free ocean pixels, region B has 0.5 (50-59%), region C has 0.2 (20-29%) and region D is 0.3 (30-39%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/south/98c/s9808210_3523_n14.gcm.Z Other Files under /ebc/globec/south ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ southregion.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating southregion.msk - land mask & regions used for cloud rating This is a 2560 x 2048 binary image which includes a land mask for the southern image area (land =1) and indicates the regions ABCD. Waters in region A (Gulf of California) have a pixel value of 2, Region B (Baja California coastal waters) = 3, Region C (southern California coastal waters) = 4 and Region D (off shore waters) = 5. Region A - primarily waters in the Gulf of California - is triangular region with a northern boundary of (32.N, 116.5W) to (32.N, 106.7W) and extending to the lower right hand corner of the image. Region B - primarily waters off the western coast of Baja California - is a trapeziod with top left corner: (32.N, 120.W), top right corner: (32.N, 116.5), bottom left corner (18.76N, 120W), bottom right: (18.76N, 106.7W ). Region C - waters off the coast of Southern California - is a trapezioid with top left corner: (39.23N, 132.29W), top right (39.23N, 106.7W), bottom left: (32.N, 120.W), bottom right (32.N,106.7W). Region D - covers all waters not included in the previous 3 regions - generally those far offshore. /ebc/globec/north ================= Images stored under this directory are of a large region off the North American west coast. They are mapped to a rectangular grid with corners: bottom right: (35.76N, 117.76W) top left: (56.23N, 138.23W) and the images are 2048 (samples) x 2048 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). The byte value (goes from 0 - 255) in these images represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/north ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY YYc - cloud masks for images in /ebc/globec/north/YY where YY represents the last 2 digits of the year. Image names consist of nYYDDDZZ_ABCD_SSS.gbc(_u).Z where n indicates this is the more northern of the 2 regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: nYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" For example, /ebc/globec/north/98/n9808411_2300_n14.gbc.Z is an image of the northern region from GMT hour 11 of the 84nd day (Mar 24) of 1998. Region A has about 0.2 (20-29%) cloud-free ocean pixels, region B has 0.3 (30-39%), region C has 0.0 (0-10%) and region D is 0.0 (0-10%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/north/98c/n9808411_2300_n14.gcm.Z Other Files under /ebc/globec/north ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ northregion.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating northregion.msk - land mask & regions used for cloud rating This is a 2048 x 2048 binary image which includes a land mask for the northern image area (land =1) and indicates the regions ABCD. Waters in region A (Central California coastal waters) have a pixel value of 2, Region B (Oregon/Washington coastal waters) = 3, Region C (British Columbia/S. Alaskan coastal waters) = 4 and Region D (offshore waters) = 5. Region A - primarily waters off the coast of central California - is a rectangular region with the top left corner at (42.N, 129.W) to (35.76.N, 117.76W) in the lower right hand corner of the image. Region B - primarily waters off the coasts of Oregon and Washington - is a rectangle with top left corner (48.N,129.W), bottom right corner (42.N,117.76). Region C - waters off the coast of British Columbia and southern Alaska - a trapezioid with top left corner: (56.23N, 138.23W), top right (56.23N, 117.76W), bottom left: (48.N, 130.W), bottom right (48.N,117.76W). Region D - all waters not included in the previous 3 regions - generally those far offshore. b.Gulf of Alaska Images from from multi-channel algorithms: Aug 25,2000 - June 30, 2005 ----------------------------------------------------------- /ebc/globec/goaeast ================ Images stored under this directory are of a large region in the eastern Gulf of Alaska. They are mapped to a rectangular grid with corners: bottom right: (49.6N, 124.76W) top left: (62.39N, 145.23W ) and the images are 2048 (samples) x 1280 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). For Images from 0023600-0026001 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. For Images after 0026001- present and form days before 0023600 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C +3.0 ) and covers the range -3. - 22.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/goaeast ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY YYc - cloud masks for images in /ebc/globec/goaeast/YY where YY represents the last 2 digits of the year. Image names consist of eYYDDDZZ_ABCD_SSS.gbc(_u).Z, where e indicates this is the more eastern of the 2 GOA regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8-0.9 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: eYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" For example, /ebc/globec/goaeast/00/e0031315_2022_n14.gbc.Z is an image of the southern region from GMT hour 15 of the 313th day of 2000. Region A has about 0.2 (20-29%) cloud-free ocean pixels, region B has 0.0 (0-9%), region C has 0.2 (20-29%) and region D is 0.2 (20-29%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/goaeast/00/e0031315_2022_n14.gcm.Z Other Files under /ebc/globec/goaeast ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ goaeast.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating goaeast.msk - land mask & regions used for cloud rating This is a 2048 x 1280 binary image which includes a land mask for the eastern GOA image area (land =1) and indicates the regions ABCD. Waters in region A ((off shore waters) have a pixel value of 2, Region B (southern GOA coastal waters) = 3, Region C (Central GOA coastal waters) = 4, and Region D (Northeastern GOA coastal waters) = 5. Region A - offshore waters in the southwestern area of the image - is a triangle with corners: (49.6N, 145.23W), (52.6N, 145.23),and (49.6N, 135W). Region B - Southeastern Gulf of Alaska coastal waters - is a trapezioid with top left corner: (51.5N, 138.0W), top right: (56N, 124.76W), bottom right: (49.6N, 124.76W), bottom left: (49.6N,135.0W). Region C - Central Gulf of Alaska coastal waters - is a trapezioid with top left corner: (55.0N, 143.0W), top right: (61N, 124.76W), bottom right:(56N, 124.76W),bottom left: (51.5N, 138.0W) Region D - primarily waters in the coastal Northeastern Gulf of Alsaka - is a an irregular pentagon with corners (62.39.N, 145.23W), (62.39.N, 124.76W),(61.0N,124.76W), (55.0N,143.0W),(56.2N,145.23W). /ebc/globec/goawest ================= Images stored under this directory are of a large region of the western portion of the Gulf of Alaska in the NE Pacific. They are mapped to a rectangular grid with corners: bottom right: ( 49.6N, 144.76W) top left: (62.39N, 165.23W ) and the images are 2048 (samples) x 1280 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). For Images from 0023600-0026001 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. For Images after 0026001- present and form days before 0023600 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C +3.0 ) and covers the range -3. - 22.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/goawest ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY YYc - cloud masks for images in /ebc/globec/goawest/YY where YY represents the last 2 digits of the year. Image names consist of wYYDDDZZ_ABCD_SSS.gbc(_u).Z where n indicates this is the more western of the 2 GOA regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: wYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" For example, /ebc/globec/goawest/00/w0031915_1131_n14.gbc.Z is an image of the northern region from GMT hour 15 of the 319th day of 2000. Region A has about 0.1 (10-19%) cloud-free ocean pixels, region B has 0.1 (10-19%), region C has 0.3 (30-39%) and region D is 0.1 (10-19%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/goawest/00c/w0031915_1131_n14.gcm.Z Other Files under /ebc/globec/goawest ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ goawest.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating goawest.msk - land mask & regions used for cloud rating This is a 2048 x 1280 binary image which includes a land mask for the northern image area (land =1) and indicates the regions ABCD. Waters in region A (offshore waters in the South central GOA) have a pixel value of 2, Region B (SE Bering Sea coastal waters) = 3, Region C (North central GOA coastal waters) = 4 and Region D (Southwestern GOA Coastal waters) = 5. Region A - primarily offshore waters in the South central Gulf of Alaska - is a triangular region with the top right corner at (56.2.N, 144.76.W), bottom right: (49.6.N, 144.76W) and lower left: (49.6N, 160.0W). Region B - primarily waters in the Southeastern Bering Sea - is a trapezoid with top left corner (62.39,165,23.W), top right corner: (62.39N, 155W), bottom right corner: (57.5N, 156.5W) and bottom left: (54.2N, 165.23W). Region C - coastal waters in the Northcentral Gulf of Alaska - a trapezioid with top left corner: (62.39N, 155W) , top right (62.39N, 144.76WW), bottom right: (54.7N, 151.0W), and bottom left: (57.5N, 156.5W). Region D - coastal waters in the Western gulf of Alsaka - a trapezioid with top left corner: (54.2N, 165.23W) , top right: (57.5N, 156.5W) , bottom right: (54.7N, 151.0W), and bottom left: (49.6N, 160.0W). c.1 km resolution Images from from channel 4 only for the Gulf of Alaska: Aug 25,2000 - June 30, 2005 ----------------------------------------------------------------------- /ebc/globec/goaeastch4 ====================== Images stored under this directory are of a large region in the eastern Gulf of Alaska. The region of coverage and resolution are identical to the files found in /ebc/globec/goaeast. The /ebc/globec/goaeast files are processed using a multi-channel algorithm. The /ebc/globec/goaeastch4 images are from AVHRR channel 4 only. They are mapped to a rectangular grid with corners: bottom right: (49.6N, 124.76W) top left: (62.39N, 145.23W ) and the images are 2048 (samples) x 1280 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). For Images from 0023600-0026001 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. For Images after 0026001- present and form days before 0023600 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C +3.0 ) and covers the range -3. - 22.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/goaeastch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY where YY represents the last 2 digits of the year. Image names consist of fYYDDDZZ_ABCD_SSS.gbc(_u).Z, where e indicates this is the more eastern of the 2 GOA regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8-0.9 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: eYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm". The cloud mask files are derived from the multichannel images from the same day and time and will be found in directory /ebc/globec/goaeast/YYc. For example, /ebc/globec/goaeastch4/00/f0031315_2022_n14.gbc.Z is an image of the southern region from GMT hour 15 of the 313th day of 2000. Region A has about 0.2 (20-29%) cloud-free ocean pixels, region B has 0.0 (0-9%), region C has 0.2 (20-29%) and region D is 0.2 (20-29%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/goaeast/00/e0031315_2022_n14.gcm.Z Other Files under /ebc/globec/goaeastch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ goaeast.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating goaeast.msk - land mask & regions used for cloud rating This is a 2048 x 1280 binary image which includes a land mask for the eastern GOA image area (land =1) and indicates the regions ABCD. Waters in region A ((off shore waters) have a pixel value of 2, Region B (southern GOA coastal waters) = 3, Region C (Central GOA coastal waters) = 4, and Region D (Northeastern GOA coastal waters) = 5. Region A - offshore waters in the southwestern area of the image - is a triangle with corners: (49.6N, 145.23W), (52.6N, 145.23),and (49.6N, 135W). Region B - Southeastern Gulf of Alaska coastal waters - is a trapezioid with top left corner: (51.5N, 138.0W), top right: (56N, 124.76W), bottom right: (49.6N, 124.76W), bottom left: (49.6N,135.0W). Region C - Central Gulf of Alaska coastal waters - is a trapezioid with top left corner: (55.0N, 143.0W), top right: (61N, 124.76W), bottom right:(56N, 124.76W),bottom left: (51.5N, 138.0W) Region D - primarily waters in the coastal Northeastern Gulf of Alsaka - is a an irregular pentagon with corners (62.39.N, 145.23W), (62.39.N, 124.76W),(61.0N,124.76W), (55.0N,143.0W),(56.2N,145.23W). /ebc/globec/goawestch4 ====================== Images stored under this directory are of a large region of the western portion of the Gulf of Alaska in the NE Pacific. The region of coverage and resolution are identical to the files found in /ebc/globec/goawest. The /ebc/globec/goawest files are processed using a multi-channel algorithm. The /ebc/globec/goawestch4 images are from AVHRR channel 4 only. They are mapped to a rectangular grid with corners: bottom right: ( 49.6N, 165.23W) top left: (62.39N, 144.76W ) and the images are 2048 (samples) x 1280 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). For Images from 0023600-0026001 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. For Images after 0026001- present and form days before 0023600 the byte value (goes from 0 - 255) represents 10. x ( approx sea surface temp in degrees C +3.0 ) and covers the range -3. - 22.5 degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/goawestch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY where YY represents the last 2 digits of the year. Image names consist of xYYDDDZZ_ABCD_SSS.gbc(_u).Z where n indicates this is the more western of the 2 GOA regions, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Cloud mask filenames are of the form: wYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" The cloud mask files are derived from the multichannel images from the same day and time and will be found in directory /ebc/globec/goawest/YYc. For example, /ebc/globec/goawestch4/00/x0031915_1131_n14.gbc.Z is an image of the northern region from GMT hour 15 of the 319th day of 2000. Region A has about 0.1 (10-19%) cloud-free ocean pixels, region B has 0.1 (10-19%), region C has 0.3 (30-39%) and region D is 0.1 (10-19%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/goawest/00c/w0031915_1131_n14.gcm.Z Other Files under /ebc/globec/goawestch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ goawest.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating goawest.msk - land mask & regions used for cloud rating This is a 2048 x 1280 binary image which includes a land mask for the northern image area (land =1) and indicates the regions ABCD. Waters in region A (offshore waters in the South central GOA) have a pixel value of 2, Region B (SE Bering Sea coastal waters) = 3, Region C (North central GOA coastal waters) = 4 and Region D (Southwestern GOA Coastal waters) = 5. Region A - primarily offshore waters in the South central Gulf of Alaska - is a triangular region with the top right corner at (56.2.N, 144.76.W), bottom right: (49.6.N, 144.76W) and lower left: (49.6N, 160.0W). Region B - primarily waters in the Southeastern Bering Sea - is a trapezoid with top left corner (62.39,165,23.W), top right corner: (62.39N, 155W), bottom right corner: (57.5N, 156.5W) and bottom left: (54.2N, 165.23W). Region C - coastal waters in the Northcentral Gulf of Alaska - a trapezioid with top left corner: (62.39N, 155W) , top right (62.39N, 144.76WW), bottom right: (54.7N, 151.0W), and bottom left: (57.5N, 156.5W). Region D - coastal waters in the Western gulf of Alsaka - a trapezioid with top left corner: (54.2N, 165.23W) , top right: (57.5N, 156.5W) , bottom right: (54.7N, 151.0W), and bottom left: (49.6N, 160.0W). d.3 km resolution California Current images from AVHRR channel 4 only: Jan.1,1992-July 1, 2005 ---------------------------------------------------------------------- /ebc/globec/centralch4 ====================== Images stored under this directory are of a large region off the North American west coast which includes portions of of both the north and south 1 km regions. They are mapped to a rectangular grid with corners: bottom right: (23.14N, 108.14W) top left: (53.83N, 138.83W) and the images are 1024 (samples) x 1024 (lines) byte arrays. In degrees, the pixel size is 0.03 degrees longitude (east-west) and 0.03 degrees latitude (north-south). For days 98117 (Apr 27, 1998) - 9811212 ( May 1, 1998 ), the byte value (goes from 0 - 255) in these images represents ( approx sea surface temp in degrees C ) / 0.127 and covers the range 0. - 32.5 degrees C. For days 9811212 (May 1, 1998) - the present and for days 92001 (Jan 1,1992) - 98116 (Apr 26, 1998), the byte value (goes from 0 - 255) in these images represents 8. x ( approx sea surface temp in degrees C ) and covers the range 0. - 32. degrees C. Cloud masks files are also byte images. The pixel values are either 0, which indicates a cloud-free region or 1 which indicates clouds. Directories under /ebc/globec/centralch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YY - processed images images for the 19YY or 20YY YYc - cloud masks for images in /ebc/globec/north/YY where YY represents the last 2 digits of the year. Image names consist of cYYDDDZZ_ABCD_SSS.gbc(_u).Z where n indicates this is the central region, YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass. ABCD represents the (decimal) fraction of cloud-free ocean pixels in 4 different regions of the image (e.g. A=8 means 0.8 of the ocean pixels in region A are cloud-free) - the regions are described below. SSS is the satellite which recorded the image - at this time either n12 (representing NOAA-12) or n14 (for NOAA-14). Filenames may include ".gbc_u.Z" (rather than just ".gbc.Z", this indicates unsatisfactory navigation of the image. Some images of the central region are not accompanied by cloud mask files. The file names for these images have "xxxx" in place of the numbers which would usually represent the fractions of cloud-free pixels. An example is c9815111_xxxx_n14.gbc. Cloud mask filenames are of the form: cYYDDDZZ_ABCD_SSS.gcm(_u).Z This is identical to the corresponding image filename except "gbc" is replaced by "gcm" For example, /ebc/globec/centralch4/98/c9812102_5111_N12.gbc.Z is an image of the central region from GMT hour 02 of the 121st day (May 1) of 1998. Region A has about 0.5 (50-59%) cloud-free ocean pixels, region B has 0.1 (10-19%), region C has 0.1 (10-19%) and region D is 0.1 (10-19%) cloud-free. Navigation of this image was judged satisfactory. The corresponding cloud mask image will be /ebc/globec/centralch4/98c/c9812102_5111_N12.gcm.Z Other Files under /ebc/globec/centralch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ centralregion.ps - a grayscale postscript file with a map showing the land mask & regions used for cloud rating centralregion.msk - land mask & regions used for cloud rating This is a 1024 x 1024 binary image which includes a land mask for the central image area (land =1) and indicates the regions ABCD. Waters in region A (Southern California bight & Baja) have a pixel value of 2, Region B (California/Oregon/Washington coastal waters) = 3, Region C (British Columbia coastal waters) = 4 and Region D (offshore waters) = 5. Region A - primarily waters off the coast of Southern and Baja California - is a trapeziodal region with the top left corner at (35., 129.41W), top right (35.N,108.14W), bottom left (23.14N, 123.5) and lower right (23.14,108.14). Region B - off the coasts of central and northern California and Oregon and Washington - is a trapezoid with top left corner (48.N,136.4W), top left corner (48.,108.14W), bottom left corner (35.N,129.41W), and bottom right corner (35.N,108.14W). Region C - waters off the coast of British Columbia - is a trapezioid with top left corner (53.833N, 138.83W), top right (58.83N, 108.14W), bottom left: (48.N, 136.4W), bottom right (48.N,108.14W). Region D - all waters not included in the previous 3 regions - generally those far offshore. e.California Current Images from AVHRR channel 4 only: Nov. 1, 1997-Mar, 17,1998 ------------------------------------------------------------- /ebc/globec/oldch4 ================== Images are available for November, 1997 through March 17, 1998. No cloud masks are available for these images. These images are obtained using AVHRR channel 4 only, so temperatures should be considered very approximate. Images are graded based on the perceived percentage of cloud-free ocean and on the accuracy of the Ocean Imaging coastline navigation. Images are assigned either an "m" or a "g" cloudiness grade, with "m" being marginal to moderate ocean visibility and "g" representing good ocean visibility. If the coastline navigation is satisfactory (within ~1-3 km or pixels), only the cloudiness grade ("m" or "g") will be used. If the navigation does not fall within tolerance levels, an "n" is appended to the grade, making it "mn" or "gn" and this 2 letter combination is appended to the first part of the filename. Directories under /ebc/globec/oldch4 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /ebc/globec/oldch4/south ~~~~~~~~~~~~~~~~~~~~~ Images stored under this directory are of a large region off the southern North American west coast. They are mapped to a rectangular grid with corners: bottom right: ( 18.76N, 106.66W) top left: (39.23N, 132.29W ) and the images are 2560 (samples) x 2048 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). The byte value (goes from 0 - 255) in these images represents 10. x ( approx sea surface temp in degrees C - 7.0 ) and covers the range 7. - 32.5 degrees C. Directories under /ebc/globec/oldch4/south ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 97 - processed 1997 images with useful data beginning in November 98 - processed 1998 images with useful data ending March 17, 1998 Image names consist of YYDDDZZs_Q(N).gbc.Z where YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass, s indicates this is the more southern of the 2 regions and Q(N) is the one, or optionally 2, letter rating of cloudiness and navigation. For example, /ebc/globec/ch4/south/97/9736014s_mn.gbc.Z is an image of the southern region from GMT hour 14 of the 360th day (Dec 26) of 1997 and there is judged to be significant clear water visible. Additionally, navigation of this image was judged unsatisfactory. /ebc/globec/oldch4/north ~~~~~~~~~~~~~~~~~~~~~ Images stored under this directory are of a large region off the North American west coast. They are mapped to a rectangular grid with corners: bottom right: (35.76N, 117.76W) top left: (56.23N, 138.23W) and the images are 2048 (samples) x 2048 (lines) byte arrays. In degrees, the pixel size is 0.0100 degrees longitude (east-west) and 0.010 degrees latitude (north-south). The byte value (goes from 0 - 255) in these images represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. Directories under /ebc/globec/oldch4/north ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 97 - processed 1997 images with useful data beginning in November 98 - processed 1998 images with useful data ending March 17, 1998 Image names consist of YYDDDZZn_Q(N).gbc.Z where YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass, s indicates this is the more northhern of the 2 regions and Q(N) is the one, or optionally 2, letter rating of cloudiness and navigation. For example, /ebc/globec/ch4/north/98/9804322n_m.gbc_Z is an image of the northern region from GMT hour 22 of the 43rd day (Feb 12) of 1998 and there is judged to be significant clear water visible. Additionally, navigation of this image was judged satisfactory. _______________________________________________________________________ 3. EBC California Current images from July 1992 to October 1997 _______________________________________________________________________ These images are 512 x 512 byte arrrays with data from AVHRR channel 4 only, and no atmospheric correction or cloud mask (clouds are usually colder than the water). Temperatures obtained from these images are therefore very much approximate. The byte value (goes from 0 - 255) in these images represents 10. x ( approx sea surface temp in degrees C ) and covers the range 0. - 25.5 degrees C. Images are graded based on the perceived percentage of cloud-free ocean and on the accuracy of the Ocean Imaging coastline navigation. Images are assigned either an "m" or a "g" cloudiness grade, with "m" being marginal to moderate ocean visibility and "g" representing good ocean visibility. If the coastline navigation is satisfactory (within ~1-3 km or pixels), only the cloudiness grade ("m" or "g") will be used. If the navigation does not fall within tolerance levels, an "n" is appended to the grade, making it "mn" or "gn" and this 2 letter combination is appended to the first part of the filename. /ebc/onr_ebc/satebc =================== Images stored under this directory are of a region off the central California coast. They are mapped to a rectangular grid with corners: bottom right: (35.007N, 121.450W) top left: (40.981N, 129.035W) giving a pixel size of about 1.3 km in each direction. In degrees, the pixel size is 0.01484 degrees longitude (east-west) and 0.01169 degrees latitude (north-south). Images are available for July 1992 through October, 1997. Directories under /ebc/onr_ebc/satebc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ insitu - contains met buoy and sealevel data 92 - processed 1992 Calif. coast images with useful data beginning in July 93 - processed 1993 Calif. coast images with useful data 94 - processed 1994 Calif. coast images with useful data 95 - processed 1995 Calif. coast images with useful data 96 - processed 1996 Calif. coast images with useful data 97 - processed 1997 Calif. coast images with useful data ending in October. Image names consist of satYYDDDZZQ(N).ebc.Z where YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass and Q(N) is the one, or optionally 2, letter rating of cloudiness and navigation decribed in section 1. For example, /ebc/satebc/95/sat9526309m.ebc.Z is an image of the southern region from GMT hour 09 of the 263rd day (Sep 20) of 1995 and there appears to be some clear water visible. Additionally, navigation of this image was judged satisfactory. Other Files under /ebc/onr_ebc/satebc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ There are five files that can be used as overlays for the region, with 0 or 1 byte values -- a line should be drawn (graphic plane enabled) where there are values of 1. coast.ebc -- the CIA_WDB2 coastline for this region grid.ebc -- a grid of labelled lat-lon lines with 1 degree spacing tics.ebc -- unlabelled crosses every 1 degree cstgrid.ebc -- combination of coastline and grid csttics.ebc -- combination of coastline and tics. /ebc/onr_ebc/nstebc =================== Images stored under this directory are of a region off the Oregon/Washington coast. They are mapped to a rectangular grid with corners: bottom right: (40.975N, 121.090W) top left: (46.952N, 129.394W) giving a pixel size of about 1.3 km in each direction. In degrees, the pixel size is 0.01622 degrees longitude (east-west) and 0.01167 degrees latitude (north-south). Images are available for January 1994 through October, 1997. Directories under /ebc/onr_ebc/nstebc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 94 - processed 1994 OR/WA coast images with useful data 95 - processed 1992 OR/WA coast images with useful data 96 - processed 1993 OR/WA coast images with useful data 97 - processed 1994 OR/WA coast images with useful data ending in October. Image names consist of nstYYDDDZZQ(N).ebc.Z where YY is the 2 digit year, DDD is the yearday (January 1 is day 1), ZZ is approximate Greenwich mean time of the pass and Q(N) is the one or optionally 2 letter rating of cloudiness and navigation described in seaction 1. For example, /ebc/nsttebc/95/nst9526221gn.ebc.Z is an image of the southern region from GMT hour 21 of the 262nd day (Sep 19) of 1995 and there appears to be significant clear water visible. Additionally, navigation of this image was judged unsatisfactory. Other Files under /ebc/onr_ebc/nsttebc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ There is one file that can be used as an overlay for the images, with 0 or 1 byte values -- a line should be drawn (graphic plane enabled) where there are values of 1. coas.nst -- the CIA_WDB2 coastline for this region _________________________________________________________________________ ========================================================================= II. Pathfinder AVHRR 9 day Composites for 1997-2003 ========================================================================= _________________________________________________________________________ These composites are created from 9 km Pathfinder AVHRR data available from the NOAA/NASA Oceans Pathfinder Page (http://podaac.jpl.nasa.gov/sst/). The global images are subsetted to the NE Pacific Region and composite images are created by taking the warmest pixel from any image during a 9 day period. The images are byte arrays of 796 samples x 489 lines and cover an area with corners: bottom right: (20.0N, 100.0W) top left: (63.0N, 170.0W) The byte value (goes from 0 - 255) in these images represents ( approx sea surface temp in degrees C + 3.0 ) / 0.15 and covers the range -3. - 35.5 degrees C. The composites are currently available for the years 1995 and 1996. They were created from Pathfinder AVHRR data obtained from the JPL site http://podaac.jpl.nasa.gov/sst/ /ebc/globec/pathfinder ====================== 1995 Composites centered every 7 days for 1995 1996 Composites centered every 7 days for 1996 1997 Composites centered every 7 days for 1997 1998 Composites centered every 7 days for 1998 1999 Composites centered every 7 days for 1999 2000 Composites centered every 7 days for 2000 2001 Composites centered every 7 days for 2001 2002 Composites centered every 7 days for 2002 2003 Composites centered every 7 days for 2003 The filenames are of the format YYYYDDDH09-COMP.RAW where YYYY is the 4 digit year and DDD is the yearday of the middle day of the 9 day composite time period. The H09 indicates that the resolution is 9 km. _____________________________________________________________________ ========================================================================= III. SeaWiFs Ocean color Daily Composite Images ========================================================================= _____________________________________________________________________ _____________________________________________________________________ 1. Information applying to all images _____________________________________________________________________ Data available here consists of daily and 8-day remapped composites chlorophyll concentration data stored in Hierarchical Data Format (HDF).. The 8-day composites are available only with theexplicit permission of Dr. Andrew Thomas (thomas@maine.edu). Coverage includea the Gulf of Alaska and the California Current from late 1997 through 2005. The SeaWiFS data have been generously provided by Dr. Andrew Thomas of theUniversity of Maine, Orono, ME ( http://wavy.umeoce.maine.edu ). Please be aware that the SeaWiFS data in this directory are research products. They are made available to NASA-registered SeaWiFS Users in the GLOBEC community and elsewhere on an "as is" basis for improved visualization of chlorophyll fields and for use in comparison of multidisciplinary data sets, in keeping with the concept and spirit of GLOBEC. We do ask, however, that users of the data follow the following policies, as required by NASA and/or U.S. GLOBEC data policies: Any reproduction or use for any purpose (presentations, reports, publications, etc.) must acknowledge the data source (Dr. Andrew Thomas, School of Marine Sciences, University of Maine). With regards to use of these data in manuscripts, users are expected to follow the stated U.S. GLOBEC Data Policy as outlined in U.S. GLOBEC Report 10, pg 6: "The reader is reminded that it is not ethical to publish data without proper attribution or co-authorship. Beyond this, the U.S. GLOBEC Scientific Steering Committee believes that the intellectual investment and time committed to the collection of a data set entitles the investigator to the fundamental benefits of the data set. Therefore, publication of descriptive or interpretive results derived immediately and directly from the data is the privilege and responsibility of the investigators who collect the data. The purpose of a data archive is to facilitate colaboration between scientists, the combination of multiple data sets for interdisciplinary and comparative studies, and the development and testing of new theories. Any scientist making substantial use of a data set should communicate with the investigators who acquired the data prior to publication and anticipate that the data collectors will be co-authors of published results. This extends to model results and to data organized for retrospective studies," All SeaWiFS images are provided as a courtesy to properly registered NASA SeaWiFS investigators. Please see the website, http://seawifs.gsfc.nasa.gov/cgibrs/apply.pl?page=du to become a registered SeaWiFS investigator - it is a very quick process. Any use of these images must abide by the SeaWiFS Data Policy. As a general rule, these images cannot be used publicly (newspaper, flyers, etc.) without permission from ORBIMAGE. The ocean color data are stored in a floating point array which represents the actual chlorophyll concentration in mg/m^3. A value of -32767 indicates land and a value of -1. indicates missing data. The images are top-down so array element (0,0) is the top left corner. The data are stored in Hierarchical Data Format (HDF). Popular commercial software such as IDL (http://www.rsinc.com) and MATLAB (http://www.mathworks.com) are already configured with utilities for readily manipulating HDF files. Some detailed examples of IDL and MATLAB programs dealing with SeaWiFS HDF files can be found on the web site at the Satellite Oceanography Data Lab, University of Maine (http://wavy.umeoce.maine.edu) courtesy of Dr. Andrew Thomas. Click on "Image Library" on the left. A library of public domain HDF tools, FORTRAN and C libraries and related imaging software can also be found at University of Illinois at Urbana-Champaign (http://hdf.ncsa.uiuc.edu) and clicking on "HDF Tools", then "Software Using HDF" under "Other Tools of Interest". _____________________________________________________________________ 2. Globec NE Pacific Color Images _____________________________________________________________________ a. California Current Images from Sept. 4, 1997 - Dec. 31, 2005: ------------------------------------------------------------------ /ebc/seawifs/cal ================= California current images are stored under /ebc/seawifs/cal. The images are mapped to a recangular grid with corners: bottom right: ( 20.0N, 105.0W) top left: (55N, 135.0W ) and they are 833 (samples) x 972 (lines). The pixel size is 0.036 degrees. Directories under /ebc/seawifs/cal ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YYYY chalorophyll daily composites forthe year YYYYY. Image names are comp-mapCALYYYYDDD.hdf.gz. CAL indicates this is data for the California current Region, YYYY is the year and DDD is the yearday. Thie files are compressed using gzip compresson. b. Gulf of Alaska Images from Sept. 4, 1997 - Dec. 31, 2005: ------------------------------------------------------------------ /ebc/seawifs/goa ================= Gulf of Alaska images are stored under /ebc/seawifs/goa. The images are mapped to a recangular grid with corners: bottom right: ( 50.0N, 125.0W) top left: (62N, 160.0W ) and they are 545 (samples) x 333 (lines). The pixel size is 0.036 degrees in latitude and 0.064 degrees in longitude. Directories under /ebc/seawifs/goa ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ YYYY chalorophyll daily composites forthe year YYYYY. Image names are comp-mapAKYYYYDDD.hdf.gz. AK indicates this is data for the California current Region, YYYY is the year and DDD is the yearday. Thie files are compressed using gzip compresson. _________________________________________________________________________ ========================================================================= IV. Using Anonymous FTP to obtain images ========================================================================= _________________________________________________________________________ ------------------------------------------------------------------------- To log on to our anonymous ftp site and locate the AVHRR archive using a command line interface to ftp, type: ftp coho.coas.oregonstate.edu login or username: anonymous password: use your email address as a password ["ftp>" will be used to indicate the prompt on your ftp client. You should type whatever appears after "ftp>"] ftp> cd /ebc ftp> ls This will show you the directories and files in the top level directory. File aareadme.txt is the most recent readme file. Please use BINARY format to download all images. To enable binary mode on your ftp client, type (Do this now, so you don't forget later) ftp> binary Use the info given in the above sections to determine which images you want. Then change to the appropriate directory using the "cd" command. For example, if you want to obtain images of the ocean off the Oregon/Washington coast during 1996, change to /ebc/nstebc/96 with ftp> cd /ebc/nstebc/96 Each image directory contains many files. You can list all of them with ftp> ls If your computer/ftp supports wildcards, you can narrow the scope of your listing. For example, to see what images are available between May 29, 1996 (day 150) and June 7, 1996 (day 159): ftp> ls nst9615*.ebc* To download an individual image file to your computer, use ftp> get filename where "filename" is the name of the file. Be sure binary file transfer is enabled. IF your computer/ftp client supports wildcards and you want multiple files, you can save yourself some typing by using "mget" and wildcards: ftp> mget nst9615*.ebc* Always test wildcard support using the "ls" command before using mget! If your computer/ftp client does not support or interpet the wildcards as you expect, you may wind up trying to download hundreds of images. When you are finished, type "exit" or "bye" at the prompt: ftp> bye If you are using a graphical interface to ftp, use coho.coas.oregonstate.edu as the remote host address, anonymous as your user name and your email address as your password. All files related to this archive are under subdirectory ebc. Be sure to transfer all image files using binary mode. =========================================================================== =========================================================================== Please let me know if you find errors in this readme or if you have questions or comments : Corinne James (541) 737-2270 corinne@coas.oregonstate.edu