Elevation - 40 of 39
Elevation FAQs - 39 Found
The area of coverage of any particular NED layer is generally determined by the availability of source elevation data of similar or higher resolution. For example, the 1/3 arc-second layer is available for only the portions of Alaska where higher resolution lidar or IfSAR elevation sources exist. The 1/9 arc-second layer is available in the US only where high-resolution, high-accuracy lidar or photogrammetric collections have been performed. The coverage of these higher resolution layers continually increases as new elevation data are collected and added to the NED.
The NED spatial metadata is the most current and reliable source for information regarding available coverage for each of the NED layers described below. Spatial metadata may be downloaded from the NED Spatial Metadata web page.
- The NED 2 arc-second dataset covers the state of Alaska.
- The NED 1 arc-second dataset covers the conterminous United States, and most of Canada and Mexico. It also covers Hawaii, areas of Alaska, Puerto Rico and the Territorial Islands of the US.
- The NED 1/3 arc-second dataset covers the conterminous United States, Hawaii, areas of Alaska, and Territorial Islands of the US.
- The NED 1/9 arc-second dataset covers areas of the conterminous United States and limited areas of Alaska.
- Production of a conterminous US 1-meter dataset will begin in early 2015 and will increase in geographic coverage as new high-resolution data are acquired.