Geographic Projection
Files for mean depth to bedrock
Files for mean depth to bedrock
Data set reference code -- 1996-0002
To accommodate users with a variety of GIS software, the data giving the
mean depth to bedrock are available in several different formats. The
files needed by each of the types of user below are described
separately.
NOTE -- Most of these files have been compressed using
the GNU gzip program, as indicated by the .gz file
extension. Users who do not have access to the gunzip
decompression program can request that files be uncompressed prior to
transfer via ftp. In some cases, however, the uncompressed file may be
very much larger than the compressed version, greatly increasing file
transfer time.
The orginal STATSGO mapunits for the 48 states have been merged into a
single Arc/Info polygon (vector) coverage. The mean depth to bedrock
for each mapunit is given by the INFO table MU_ROCKDEPM, which may be
RELATEd to the mapunit coverage using "MUID" as the relate item. The
needed files are
-
mu_poly.e00.gz (101 Mbyte, uncompresses to 269 Mbyte)
- Mapunit polygon coverage in Arc/Info EXPORT format.
-
mu_rockdepm.e00.gz (66 kbyte, uncompresses to 209 kbyte)
- INFO table giving mean depth to bedrock for each mapunit, in cm, in
Arc/Info EXPORT format.
The mapunits have been gridded at 30-arcsec cell size. The mean depth to
bedrock for each grid cell may be downloaded as a single file:
Warning -- The uncompressed version of the grid
file below is very much larger than the compressed version.
-
rockdepm.e00.gz (6.6 Mbyte, uncompresses to 176 Mbyte)
- 30-arcsec grid giving mean depth to bedrock, in cm, in Arc/Info grid
format.
The 30-arcsec gridded data are also available as a two-dimensional array of
8-bit binary values. The data are organized by horizontal rows, with
the top (northern-most) row first, and the data for each row starting at
the left (western) end of the row.
The array contains 2984 rows of 6936 values each. Code for reading the
binary array is available in Fortran 77
and C.
The data are contained in a single file:
-
rockdepm.bsq.gz (1.7 Mbyte, uncompresses to 18 Mbyte)
- Two-dimensional array of 8-bit unsigned integer values for mean
depth to bedrock, in cm, for each grid cell.
The filesystems containing the datasets are cross-mounted on the local
ESSC computer network. Local Arc/Info users may find it more convenient
to copy necessary files directly to their own workspaces using the
Arc/Info COPY and COPYINFO commands. The needed directories and files
(under directory $DSREF/1996-0002/) are
- rockdepm
- Arc/Info grid giving mean depth to bedrock, in cm, for each 30-arcsec
grid cell.
- ../mapunits/mu_poly
- Arc/Info coverage containing polygon version of mapunit boundaries.
- info!MU_ROCKDEPM
- INFO table giving mean depth to bedrock for each mapunit, in cm.
Last change: 2006 Apr 14,
R. A. White / raw@essc.psu.edu
Methodws |
Datasets |
Image
STATSGO Mapunits |
Soil Texture Class |
Depth to Bedrock
Sand, Silt, Clay Fractions |
Rock Fragment Class |
Rock Fragment Volume
Bulk Density |
Porosity |
Permeability
Available Water Capacity |
pH |
Plasticity
K-Factor |
Hydrologic Soil Groups |
Curve Numbers
Background |
Methods |
Data Coverages |
Citation |
Feedback
CONUS-Soil |
STATSGO |
SSURGO
|