USGS 24K DEM for Appomattox and Vera Quadrangles
National Park Service - Appomattox Court House NHP. 2001. USGS 24K DEM for Appomattox and Vera Quadrangles. Richard Easterbrook
Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. The DEM data are stored as a series of profiles in which the spacing of the elevations along and between each profile is in regular whole number intervals. The normal orientation of data is by columns and rows. Each column contains a series of elevations ordered from south to north with the order of the columns from west to east. The DEM is formatted as one ASCII header record (A- record), followed by a series of profile records (B- records) each of which include a short B-record header followed by a series of ASCII integer elevations per each profile. The last physical record of the DEM is an accuracy record (C-record). 7.5-minute DEM (30- by 30-m data spacing, cast on Universal Transverse Mercator (UTM) projection). Provides coverage in 7.5- by 7.5-minute blocks. Each product provides the same coverage as a standard USGS 7.5-minute quadrangle without over edge. Coverage is for the Contiguous United States, Hawaii, and Puerto Rico.
- Type
- Geospatial Dataset
- Authors
- National Park Service - Appomattox Court House NHP
- Date of Issue
- 2001-01-02
- Publisher
- Richard Easterbrook
- Units
- APCO
- Keywords
- Altitude, Appomattox, Appomattox Court House National Historical Park, Contour Line, DEM, Digital Contours, Digital Elevation Model, digital terrain model, Height, Hypsography, National Park Service, United States, Vera, Virginia