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Data Delivery Updates
National Elevation Dataset (NED)
July 1, 2013: Changes with the delivery of NED 1, 1/3, and 1/9 arc-second data
As part of the National Geospatial Program's plan for delivering data from a public Internet cloud provider by 2014, The National Map is offering pre-packaged, staged products for faster and more efficient downloads. As of July 1, 2013, National Elevation Dataset (NED) 1 and 1/3 arc-second data are distributed only through pre-packaged 1x1 degree tiles in ArcGrid, GridFloat and IMG formats. Because of their very large file sizes, NED 1/9 arc-second data is distributed only through pre-packaged 15x15 minute tiles in IMG format. While we continue to offer ArcGrid and GridFloat formats for NED 1 and 1/3 arc-second, all other format options for NED 1/9 arc-second are no longer available since the move to staged elevation products has been completed.
To help with the transition, we provide downloadable file conversion scripts to assist users that need raster data in other formats. These scripts require either Geospatial Data Abstraction Library (GDAL) or Esri ArcGIS software for raster data file conversions. The documentation is in HTML and is under the 'How_To' folder. It includes procedures for getting GDAL from http://www.gisinternals.com/sdk/ and Esri based scripts that should work with ArcGIS 10.x.
For your convenience, we also provide samples of pre-packaged NED data in IMG format to download and test with software you may be using. Each of these 'zipped' archives contain along with the data, information and specifications for each dataset, as well as associated metadata. Please see the 'readme.txt' file which is included in each of the samples:
(Note: these are very large files.)
If you have questions or concerns about these changes, please contact us at firstname.lastname@example.org.