National Map

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
NED DEMs	MLRC	1" and 1/3" NED, and option to get Geotiff, which is the best format for MICRODEM
NLCD	MLRC	Probably faster and simpler than National Map, which does not have the 1992 data. Insure the program can recognize this data set after downloading and uncompressing it.
Gazetteer	USGS NAMES server
Structures		http://nationalmap.gov/structures.html Alternative to Gazetteer for some applications.
Point clouds

National Map:

Open by:
- Point browser to http://viewer.nationalmap.gov/basic/
- Pick Download Option on popup menu, after Right click on map . This option opens the downloader zoomed to your current map location.
To download data
- Zoom to your area of interest;
- Click the Download tool on the right side of the title bar;
- Choose a reference area polygon; it is probably easiest to just download the entire screen.


	Select available data products. The most useful will be: Land cover--but this does not have the 1992 data. Elevation Products (3DEP): this is NED in 1", 1/3" available nationwide; and 1/9", and the 1 m DEM available in some locations. There is now a choice for the tile size (data extent); you should pick the 15x15' choice unless you really want the larger region. Elevation Source Data (3DEP): LAS files. These are large Names--Geographic Names Information System (GNIS, or gazetteer) Less useful 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) NHD: you probably want the shapefiles for Dynamic Extract and Dynamic extract with flow table. Select format. 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 downloaded and correctly set up.
	For the elevation data, the GridFloat will be the best option; otherwise you will need GDAL.
	Zoom map to show your area. Pick the option for "Current extent" on the top of the mpa. Find products. Click on results to see metada for the data sets. You must pick the data you want and add to your cart (you use +All instead of checking each individually). Then view cart.
	Download each layer individually. From cart, export URLs to text Use Batch Download on Data Manipulation form You can try to use the BDA (Bulk Download Application). It may have challenges.

Last revision 4/28/2018