BOREAS Follow-on DSP-10 Regridded TM Mosaic Land Cover Maps, 30 minutes
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Revised: March 2, 2001

These images were produced by aggregating the 30-m land cover Thematic Mapper 
classification by CCRS to a 0.5 degree by 0.5 degree (or 30' by 30') 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 0.5 deg by 
0.5 deg pixel:

class001_30min.img
class007_30min.img
class011_30min.img
class013_30min.img
class021_30min.img
class022_30min.img
class025_30min.img
class032_30min.img
class035_30min.img
class036_30min.img
class039_30min.img
class043_30min.img
class053_30min.img
class055_30min.img
class059_30min.img
class064_30min.img
class069_30min.img
class079_30min.img
class080_30min.img
class081_30min.img
class085_30min.img
class099_30min.img
class113_30min.img
class134_30min.img
class150_30min.img
class160_30min.img
class161_30min.img
class162_30min.img

Each image is 22 pixels by 10 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_30min.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 134 - Bare disturbed area
Class 112 - Bare disturbed areas sparse vegetation cover
Class 113 - Burn rock outcrops
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


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