Elevation data provide information about terrain. Elevation refers to a spatially referenced vertical position above or below a datum surface. The framework includes the elevations of land surfaces and the depths below water surfaces (bathymetry).

Features Include: For land surfaces, the framework employs an elevation matrix. Elevation values will be collected at a post-spacing of 2 arc-seconds (approximately 47.4 meters at 40 latitude) or finer. In areas of low relief, a spacing of 1/2 arc-second (approximately 11.8 meters at 40 latitude) or finer is sought.

Links to Projects and Data Sites