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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.

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 (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.

Arc/Info grid file users

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.

Other users of gridded data

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.

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/1996-0002/) 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

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3/8/2006