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GRANIT Metadata for Digital Elevation Model - Quad 175 - MARLBOROUGH, NH

GRANIT Metadata for Digital Elevation Model - Quad 175 - MARLBOROUGH, NH

Title: Digital Elevation Model - Quad 175 - MARLBOROUGH, NH
Time Period of Content: 07/01/1979 - en/t/Pres Initial Publication Date: 03/01/1999
Originator: Complex Systems Research Center, University of New Hampshire
Abstract:
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 includes 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). The 7.5-minute DEM's provided through GRANIT are standard USGS 7.5-minute files reprocessed to conform to GRANIT standards, as described below. The elevation values are reported in feet, and are spaced at 30-meter intervals along and between each profile.
Theme Keywords: DEM, Digital Elevation Model, Digital Terrain Model, Hypsography, Altitude, Height, Contour Line, Digital Contours
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