Fortescue Quad

USGS 7.5 minute (30 Meter) Digital Elevation Models (DEM's) of Fortescue quad


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Originator: U.S. Geological Survey
Publication_Date: Unknown
Title: USGS 7.5 minute (30 Meter) Digital Elevation Models (DEM's) of
Fortescue quad
Geospatial_Data_Presentation_Form: Map
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: <>

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.
DEM's can be used as source data for digital orthophotos, and, as layers in geographic information systems, for earth science analysis. DEM's can also serve as tools for volumetric analysis, for site location of towers, or for drainage basin delineation. These data were collected as part of the National Mapping Program.

Place_Keyword: US
Place_Keyword: New Jersey
Place_Keyword: Cumberland County
Place_Keyword: Burlington County
Fortescue quad
Place_Keyword: Fortescue topo
Access_Constraints: none

Generated by mp version 2.3.6 on Fri Jun 23 11:34:35 2000