# 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.

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Automatically created on: Thu Oct 13 02:16:43 2005