BOREAS Follow-on DSP-10 Regridded Reclassified TM Mosaic Land Cover Maps, 10 by 5 minutes
-----------------------------------------------------------------------------------------
Revised: March 2, 2001

These images were produced by aggregating a reclassified version of 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.

We lumped the CCRS classes into groups that are more uniform with respect to 
carbon flux and that can be more easily parameterized within the models.  Each 
class in the "lumped" taxonomy is grouped by age, nutrient status, crown 
density, and forest type.

This results in the groups where we rank-ordered the classes as follows:  
classes 1 and 2 are low nutrient cycling;  classes 3, 4, 5 are high, moderate, 
and low carbon accumulation classes, respectively.

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:

01_wet_conf_low_10by5min.img 
02_wet_conf_med_10by5min.img
03_dry_conf_low_10by5min.img
04_dry_conf_med_10by5min.img
05_dry_conf_high_10by5min.img
06_decid_low_10by5min.img
07_decid_med_10by5min.img
08_decid_high_10by5min.img
09_mixed_med_10by5min.img
10_mixed_high_10by5min.img
11_burn_10by5min.img
12_grassland_10by5min.img
13_other_10by5min.img
14_water_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 in 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:

00_10by5min.img

The class numbers correspond to the class numbers used by CCRS in their 
classification (in parentheses).  See CCRS documentation for complete 
description. 

Class 01 Wet conifer, low density (43, 55)
Class 02 Wet conifer, medium density (25)
Class 03 Dry conifer, low density (59)
Class 04 Dry conifer, medium density (22, 32)
Class 05 Dry conifer, high density (7, 11, 21)
Class 06 Deciduous, low density (99)
Class 07 Deciduous, medium density (80)
Class 08 Deciduous, high density (79)
Class 09 Mixed, medium density (36)
Class 10 Mixed, high density (39, 53, 69, 64)
Class 11 Burn (13, 35, 81, 112, 113, 134)
Class 12 Grassland (85)
Class 13 Other (150, 160, 161, 162)
Class 14 Water (1)

Class 00 - Percent of data coverage area of image


The Pixel-Area Image
--------------------
The file "-_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