Elevation - 18 of 34

Elevation FAQs - 34 Found

What are the projection, horizontal and vertical datum, units, and cell size for NED data?

The NED data are not projected, but are provided in geographic coordinates (latitude and longitude) in units of decimal degrees, horizontally referenced on the North American Datum of 1983. All elevation values are in units of meters typically referenced to the North American Vertical Datum of 1988, although the National Geodetic Vertical Datum of 1929 and local reference datums are used in some areas outside of the conterminous United States. Most areas within the NED are available at a horizontal resolution of 1 arc-second (approximately 30 meters), and 1/3 arc-second (approx. 10 meters). Some areas from specific sources are also available at a resolution of 1/9 arc-second (approx. 3 meters).

Tags: Maps, Topographic, Data Products