WhiteStar's
Digital Elevation Data is
based on the USGS National Elevation Database 30 meter grid. Elevation
data are available in grid or vector form and can projected into user-specified
coordinate systems, making them ideal for adding elevation contours to
maps and orthophotos. Digital Elevation Models can be integrated with
WhiteStar's Public Land Survey, Texas Land Survey, and Enhanced Culture
Databases.
Data
Source
WhiteStar's Digital Elevation Models (DEM) are based on the USGS National
Elevation Database (NED) 30 meter grid.
Enhancement
WhiteStar has processed the data to remove banding artifacts and edge-match
adjoining DEMs. Elevations are available in seamless gridded form or as
vectors contoured to user specifications. WhiteStar uses ESRI GIS software
to assign z-values and label contour lines. All elevation data can be
reprojected into user-specified coordinate systems.
Content
Digital Elevation Data are delivered in grid format (30 meter spacing)
or in vector format (contour lines and labels).
Format
Digital Elevation Models are currently available in the following formats:
| ArcGIS | DEM grid or Shapefile (contours) | Download Samples | ||
| AutoCAD | DXF/DWG | |||
| GeoGraphix | Zmap Plus | |||
| Kingdom | DXF/DWG | |||
| Landmark | Landmark ASCII | |||
| MapInfo | DEM grid or Tab file (contours) | |||
| Petra | Zmap Plus | |||
| Surfer | DEM grid |
Coverage
Nationwide coverage (continental US, Alaska, Hawaii, Puerto Rico), available
by 7.5' quadrangle or 1 degree block.
Application
Land mapping, oil and gas exploration, pipeline mapping, agriculture,
forestry, transportation and other government functions.
Digital
Elevation Data used to create contoured shaded relief map.
