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Finding and Using GIS Data

The AGS Library's Guide to Finding GIS data and working with it for your specific project needs

The National Map details

The National Map

Homepage: https://viewer.nationalmap.gov/basic/

About: The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. It has many uses ranging from recreation to scientific analysis to emergency response. The National Map is easily accessible for display on the Web, as products and services, and as downloadable data. The geographic information available from The National Map includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures, and land cover.

Data Available: Data comes in various formats, including GIS shapefile, geodatabase, (Geo)TIFF, LAS/LAZ (LiDAR), ArcGrid (raster),

Topics Include: US topography, historical US topography, boundaries, 1-meter NAIP imagry, hydrography, elevation, place names, map indices, transportation, woodland tint, national landcover database, and more.

The National Map general instructions

How to get GIS data

1. Navigate to the data portal https://viewer.nationalmap.gov/basic/

2. Check the box by the dataset you wish to download

3. Use the options at the top of the map to choose search criteria 

4. Map indices can help by displaying the 1 degree, 15 minute, 7.5 minute, or all quadrangle boundaries on the map (Some products are “tiled” by these indices)

5. Click 'Find products'

6. In the 'Products' tab, add your desired products to the cart

7. View Cart

8. Download products

Request Data from the AGSL

Still Stuck?

If you are having trouble finding the data you are looking for, the AGS Library may be able to help.

  • Use the buttons below to view our Geospatial Data homepage, request data from our collection, or e-mail us with questions.
  • You can also call or stop in during regular business hours, Monday - Friday 8:00 am - 4:30 pm.
  • We are located in the Golda Meir Library at UWM on the 3rd floor of the East Wing. Phone: (414) 229-6282.
Geospatial Data Homepage Data Request Form E-mail us gisdata@uwm.edu