Soil Datasets

Albers Equal Area Projection Files for mean depth to bedrock Files for mean depth to bedrock Data set reference code -- 1996-0001 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. Arc/Info polygon file users Arc/Info grid file users Other users of gridded data Local users on the ESSC network 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. Arc/Info polygon file users 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 (104 Mbyte, uncompresses to 249 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. Arc/Info grid file users The mapunits have been gridded at 1-km 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 (4.8 Mbyte, uncompresses to 113 Mbyte) 1-km grid giving mean depth to bedrock, in cm, in Arc/Info grid format. Other users of gridded data The 1-km 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 2896 rows of 4616 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 (1.3 Mbyte, uncompresses to 13 Mbyte) Two-dimensional array of 8-bit unsigned integer values for mean depth to bedrock, in cm, for each grid cell. Local users on the ESSC network 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/1996-0001/) are rockdepm Arc/Info grid giving mean depth to bedrock, in cm, for each 1-km 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
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Comments and Questions 3/8/2006