The National Map Home >> 3D Elevation Program (3DEP) >> 3DEP Historical Processing Notes
Historical Processing Notes for the National Elevation Dataset
(Seamless and 1/9 arc-second DEMs)
The National Elevation Dataset Release Notes are no longer issued under 3DEP. These Release Notes were previously issued with bi-monthly releases of the National Elevation Dataset (NED) and described details about the release of the NED, its source data, and noteworthy characteristics of the dataset including accuracy, data distribution statistics, and processing notes. The standard National Map DEM layers are now updated through 3DEP on a continuous basis as new data become available. The same type of information contained within the legacy Release Notes is available through the status graphics, spatial metadata, highlights, and FGDC metadata provided with the updated 3DEP products.
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U.S. Geological Survey
