National Map

  1. Open by:
  To download data
  • Zoom to your area of interest;
  • Easiest to just download the entire screen.
 
 
  • Select available data products.  The most useful will be:
    • Elevation Products (3DEP): this is 3DEP/NED in 1", 1/3" available nationwide;  and 1/9", and the 1 m DEM available in some locations.  Different spacing in Alaska.
    • Elevation Source Data (3DEP): LAS files.  These are large
    • Names--Geographic Names Information System (GNIS, or gazetteer)
    • US Topo
    • Historical Topographic Maps
  • Generally less useful
    • Hydrography NHD: you probably want the shapefiles for Dynamic Extract and Dynamic extract with flow table.
  • Select format.  If possible you want Geotiff or Shapefile as the best formats for use in MICRODEM.  In particular avoid the Geodatabase, which is a proprietary ESRI format for Arc.  Some other formats will require that that you have GDAL


 

Elevation Products (3DEP): For the elevation data there are several formats, all of which work with varying challenges.  All will be zipped initially.

  • Geotiff
  • IMG select the IMG file and GDAL converts to a Geotiff which will open.
 

Elevation Source Data (3DEP): LAS files. 


  High resolution imagery
  • Imagery--1 foot (HRO) .This imagery may have the choice of multiple dates, some of which will include 4 bands with IR for vegetation analysis.
  • Imagery--1 meter (NAIP).  Newer NAIP might have higher spatial resolution.
 

Zoom map to show your area.

Pick the option for "Current extent" on the top of the mpa.

Find products.

 

Download options

 

 

 

Download options

Options here have been changing significantly

Should be able to

  • Download each tile individually. Download link LAZ in blue on the right lets you choose the directory to download a single file. Easiest choice if you want just a few file.
  • Batch download
  • You must pick the data you want and add to your cart (you use +All instead of checking each individually). Then view cart.  You can download all files together.

Recently (but not now) the uget option was the only one that worked; it is available from your cart where the individual download option is not present.  Use uGet only if you need a lot of files.

   



National Map Alternatives 

The table below shows alternatives to the National Map if the site is down or unresponsive.  These might also be faster and easier to use.  Most options now require you to get pre-packaged tiles, instead of packaging the region on demand that was possible with the Seamless Server model.

Data layer Alternative source Comments
Gazetteer USGS NAMES server Alternative to Gazetteer for some applications. 

Last revision 1/5/2022