Lambert Azimuthal Projection
Files for surface soil erodibility factors
Files for surface soil erodibility factors
Data set reference code -- 1998-0113
To accommodate users with a variety of GIS software, the data giving the
surface soil erodibility factors 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 surface soil erodibility
factors for each standard layer of each mapunit is given by the INFO
table MU_KFACT, which may be RELATEd to the mapunit coverage using
"MUID" as the relate item. The needed files are
-
mu_poly.e00.gz (116 Mbyte, uncompresses to 274 Mbyte)
- Mapunit
polygon coverage in Arc/Info EXPORT format.
-
mu_kfact.e00.gz (79 kbyte, uncompresses to 431 kbyte)
- INFO table giving mean surface soil erodibility factors, adjusted
(KFACT) and not adjusted (KFFACT) for rock fragments, in Arc/Info EXPORT
format.
The mapunits have been gridded at 1-km cell size. The value attribute
table (VAT) for the Arc/Info grid listed below contains the mapunit
indentifier, MUID, the mapunit serial number, MUSERIAL, and the mean
surface soil erodibility factors KFACT and KFFACT.
Warning -- The uncompressed version of the grid
file below is very much larger than the compressed version.
-
kfactgrid.e00.gz (6.4 Mbyte, uncompresses to 189 Mbyte)
- 1-km grid giving surface soil erodibility factors, in Arc/Info grid format.
The 1-km gridded data are also available as a three-dimensional array of
8-bit unsigned binary integers, representing the values of KFACT and
KFFACT multiplied by 100. The data are organized as two two-dimensional
layers, giving, respectively, mean surface soil erodibility factors
adjusted (KFACT) and not adjusted (KFFACT) for rock fragments. Within
each layer, the values are arranged by horizontal rows. All values for
the first layer are given first, starting with the value for the left
(western) end of the top (northern-most) row, and continuing left to
right along the row. The data for the last row of the first layer are
then followed by the top row of the second layer, and so on.
Each layer of the array contains 2889 rows of 4587 values each. Code
for reading the binary array is available in Fortran 77
and C.
Warning -- The uncompressed version of the BSQ file
below is very much larger than the compressed version.
-
kfact.bsq.gz (3.1 Mbyte, uncompresses to 27 Mbyte)
- Three-dimensional array of 8-bit unsigned integer values for
mean surface soil erodibility factors multiplied by 100.
-
mu_kfact.ascii.gz (46 kbyte, uncompresses to 200 kbyte)
- Table giving, for each STATSGO mapunit, the mapunit ID, mapunit
serial number, and values of KFACT and KFFACT.
The same array is also available in LAS format (files kfact.img.gz and
kfact.ddr).
The file systems 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/1998-0113/) are
- kfactgrid
- Arc/Info grid giving mean surface soil erodibility factors KFACT and
KFFACT for each 1-km grid cell.
- ../mapunits/mu_poly
- Arc/Info coverage containing polygon version of mapunit boundaries.
- info!MU_KFACT
- INFO table giving surface soil erodibility factors values for each mapunit.
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
|