Elevation - 42 of 41

Elevation FAQs - 41 Found

Load first FAQ in this category.



Load last FAQ in this category.
What is the coverage of standard 3DEP DEMs?

The area of coverage of any particular standard 3DEP DEM product 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 portions of Alaska where higher resolution lidar or ifsar elevation sources exist. The 1/9 arc-second layer is available only where high resolution, high accuracy lidar or photogrammetric collections were performed. Coverage of the higher resolution layer at 1-meter continually increases as new 3DEP-quality data are acquired.

The 3DEP spatial metadata is the most current and reliable source for information regarding available coverage for each of the DEM layers described below. Spatial metadata may be downloaded from the 3DEP Product Metadata web page.

  • The 2 arc-second dataset covers the State of Alaska.

  • The 1 arc-second dataset covers the conterminous United States (CONUS), Mexico, and Canada. It also covers Hawaii, areas of Alaska, Puerto Rico and Territorial Islands of the U.S.

  • The 1/3 arc-second dataset covers the CONUS, Hawaii, areas of Alaska, Puerto Rico and Territorial Islands of the U.S.

  • The 1/9 arc-second dataset covers areas of the CONUS and limited areas of Alaska.

  • The 1-meter dataset is available in limited areas of the CONUS but will increase in geographic coverage as additional lidar data are acquired.

Tags: Maps, Topographic, Data Products