BOREAS Follow-on DSP-10 Regridded TM Mosaic Land Cover Maps, 10 by 5 minutes ---------------------------------------------------------------------------- Revised: March 2, 2001 These images were produced by aggregating the 30-m land cover Thematic Mapper classification by CCRS to a 10' (horizontal) by 5' (vertical) pixel size in a straight latitude/longitude grid. See the document "dsp01_tm_landcover_doc.html" for more information on the original data product that this is based on. If there are any questions about how this aggregation was done, please contact Gloria Rapalee (Gloria.Rapalee@gsfc.nasa.gov) or Jaime Nickeson (Jaime.Nickeson@gsfc.nasa.gov). Image Specifications -------------------- The following files contain the percentage of each class within each 10' by 5' pixel: class001_10by5min.img class007_10by5min.img class011_10by5min.img class013_10by5min.img class021_10by5min.img class022_10by5min.img class025_10by5min.img class032_10by5min.img class035_10by5min.img class036_10by5min.img class039_10by5min.img class043_10by5min.img class053_10by5min.img class055_10by5min.img class059_10by5min.img class064_10by5min.img class069_10by5min.img class079_10by5min.img class080_10by5min.img class081_10by5min.img class085_10by5min.img class099_10by5min.img class113_10by5min.img class134_10by5min.img class150_10by5min.img class160_10by5min.img class161_10by5min.img class162_10by5min.img Each image is 66 pixels by 60 lines and contains no leading header bytes. Each pixel in the image is represented by one byte. The DN value for each pixel is the percentage of the coverage that pixel that is of a given class. The sum of all of the percentages in the various images might not be 100 for a given pixel because of rounding. An additional image is included for which the DN value for each pixel is the percentage of the coverage of the CCRS mosaic in that pixel: class00_10by5min.img The class numbers correspond to the class numbers used by CCRS in their classification. Class 1 - Water Class 7 - Coniferous high crown density black spruce Class 11 - Coniferous high crown density black spruce and Jack pine Class 13 - Burn recent bare area Class 21 - Coniferous high crown density black spruce younger Class 22 - Coniferous medium crown density jack pine Class 25 - Coniferous medium crown density black spruce Class 32 - Coniferous medium crown density black spruce, jack pine Class 35 - Burn recent sparse vegetation cover Class 36 - Mixed coniferous medium density Class 39 - Mixed coniferous high density Class 43 - Coniferous low crown density black spruce, jack pine Class 53 - Mixed forest Class 55 - Coniferous very low density Class 59 - Coniferous low crown density jack pine Class 64 - Old burns mixed regeneration cover Class 69 - Mixed deciduous forest Class 79 - Deciduous high crown density Class 80 - Deciduous medium crown density Class 81 - Older burns shrub-grass cover Class 85 - Shrubs and grassland Class 99 - Deciduous low broadleaf cover Class 112 - Bare disturbed areas sparse vegetation cover Class 113 - Burn rock outcrops Class 134 - Bare disturbed area Class 150 - Clouds Class 160 - Cropland high biomass Class 161 - Cropland medium biomass Class 162 - Cropland low biomass Class 0 - Percent of data coverage area of image The Pixel-Area Image -------------------- The file "0_pixel_area_10by5min.img" is an image that provides the area for each of the 10 by 5 minute cells. The area for each pixel is given in hectares. One hectare equals 10,000 square meters. Each pixel value is represented as a 2-byte integer. This image has the low-order byte first. On some systems, the bytes may need to be swapped in order the read the 2-byte integers correctly. On UNIX systems, this can be done with the following command. dd if=input_file_name conv=swab of=output_file_name Spatial Coverage ---------------- These data cover the same area as the regional meteorological parameters assembled by Val Pauwels. The data are in a straight latitude/longitude grid. The BOREAS grid coordinates listed below are simply given for reference purposes. The corner coordinates are identical to the upper left corner of Val's regional data set. Corner X Y Longitude Latitude ---------------------------------------------------------------- Upper Left 242.697 675.191 107¡00'00.00" W 57¡00'00.00" N Upper Right 903.583 765.939 96¡00'00.00" W 56¡00'00.00" N Lower Left 274.686 119.043 107¡00'00.00" W 52¡00'00.00" N Lower Right 1022.683 221.752 96¡00'00.00" W 52¡00'00.00" N The X and Y coordinates are the BOREAS grid coordinates, which are based on an Albers Equal Area Conic (AEAC) projection with the following parameters: Origin: 111.00 deg W, 51.00 deg N Standard Parallels: 52.5 deg N 58.5 deg N Units of Measure: kilometers