Summary:
These images were produced by aggregating a reclassified version of the
30-m land cover Thematic Mapper classification by CCRS and are now
available at multiple resolutions (10x5 minutes, and 30 minutes). These
data were regridded for use by the BOREAS Follow-on Carbon and Hydro-Meteorological
modeling groups. Characteristics of the individual products are described
below.
Maps included in this data set:
Regridded
Reclassed TM Mosaic Land Cover Maps, 10 by 5 minutes
Regridded
Reclassed TM Mosaic Land Cover Maps, 30 min
Data Citation:
Cite this data set as follows (citation revised on October 30, 2002):
Hall, F., G. Rapalee, and D. Knapp. 2001. BOREAS Follow-On DSP-10 Reclassified
Regridded TM Mosaic Land Cover Maps, 1994. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Contacts:
Forrest G. Hall
University of Maryland
NASA GSFC
Greenbelt MD
(301) 614-6659
(301) 614-6695
Forrest.G.Hall@gsfc.nasa.gov
Gloria Rapalee
University of California, Irvine
NASA GSFC
Greenbelt MD
(301) 286-0544
(301) 286-0239
grapalee@pop900.gsfc.nasa.gov
David Knapp
Raytheon ITSS
NASA/GSFC
Greenbelt, MD
Phone: (301) 286-1424
David.Knapp@gsfc.nasa.gov
Processing:
If there are any questions about how this aggregation was done, please
contact Dave Knapp (David.Knapp@gsfc.nasa.gov).
Regridded
Reclassed TM Mosaic Land Cover Maps, 10 by 5 minutes
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.
Image Specifications
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.
| Land Cover Maps, 10 by 5 minutes |
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 |
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 (in parentheses). See CCRS documentation for complete description.
|
CCRS Land Cover Classification
|
| Class ID |
Class Name |
| Class 00 |
Percent of data coverage area of image |
| 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) |
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 57°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 listed above 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
Regridded
Reclassed TM Mosaic Land Cover Maps, 30 min
These images were produced by aggregating a reclassified version of 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. 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.
Image Specifications
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 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. The following files contain
the percentage of each class within each 0.5 deg by 0.5 deg pixel:
| Land Cover Maps, 30 minutes |
01_wet_conf_low_30min.img
02_wet_conf_med_30min.img
03_dry_conf_low_30min.img
04_dry_conf_med_30min.img
05_dry_conf_high_30min.img
06_decid_low_30min.img
07_decid_med_30min.img
08_decid_high_30min.img
09_mixed_med_30min.img
10_mixed_high_30min.img
11_burn_30min.img
12_grassland_30min.img
13_other_30min.img
14_water_30min.img |
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_30min.img
The class numbers correspond to the class numbers used by CCRS in their
classification (in parentheses). See CCRS documentation for complete description.
|
CCRS Land Cover Classification
|
| Class ID |
Class Name |
| Class 00 |
Percent of data coverage area of image |
| 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) |
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
Citation:
Cite this data set as follows (citation revised on October 30, 2002):
Hall, F., G. Rapalee, and D. Knapp. 2001. BOREAS Follow-On DSP-10 Reclassified
Regridded TM Mosaic Land Cover Maps, 1994. Data set. Available on-line [http://www.daac.orn
l.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Ten
nessee, U.S.A.
Document ID:
dsp10_reclass
Document Revision Date:
27-Sep-2001 (citation revised on 30-Oct-2002)
Document Review Date:
27-Sep-2001
Document Curator:
webmaster@daac.ornl.gov
Document URL:
http://daac.ornl.gov/BOREAS/FollowOn/guides/dsp10_landcov_tm_rec_maps.html