| # GRASS Help System

U.S. Geological Survey

## (USGS)

USGS: Topological - Landuse/Landcover, Watersheds,..

Data Source:

National Cartographic Information Center
U.S. Geological Survey
User Services Section
507 National Center
Reston, VA 22092
Phone: 703-860-6045

Data Format:

Vector files in GIRAS format
Raster available in binary or character (ASCII or EBCIDIC) form

Scale/Resolution:

Vector - 1:100000 ; 1:250000

Raster - 200 meters

Data Coverage:

For coverage information write/call
NCIC for latest edition of
"Index to Land Use and Land Cover Information".

Data Description:

Separate data files are available for the following:
- landuse/landcover
- political units
- census county subdivisions
- hydrologic units(watersheds)
- federal land ownership(park,forest,..)

A Composite Theme Grid (CTG) is also available
which contains all the themes (landuse,census,..)
available for a given area. For more information
about file format contact the above address for
USGS Circular 895-E, "Land Use and Land Cover Digital Data"

Media:

9-track ASCII tapes & paper maps

Aquisition Costs:

- Landuse/Landcover $100.00
- Census Tracts $50.00
- Political Boundaries, Hydrologic Units, &
Federal Lands $35.00
- Composite Theme Grid (CTG) $250

Comments:

Data are provided in arc-node format known as
GIRAS. Programs are available to convert this to the
Digital Line Graph (DLG) standard. For more information
about GIRAS to DLG conversion, contact the above address.

GRASS Help

GRASS Documentation

GRASS WWW Home

Please use your browser buttons to navigate this documentation!
Automatically created on: Sat Jan 8 06:50:26 2005