Frequently Asked Questions

Mapping, Remote Sensing, and Geospatial Data

The USGS provides the mapping and digital geospatial foundation for the Nation.

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Example of the Landsat Burned Area Science Product
Landsat Collection 1 products will remain available for search and download through December 31, 2022. Landsat Collection 1 processing of Level-1, Level-2 Surface Reflectance and Surface Temperature; U.S. Landsat ARD; and Level-3 Burned Area, Dynamic Surface Water Extent, and Fractional Snow Cover Area products will continue through December 31,...
Landsat Collection 2 Level-1 and Level-2 examples
Landsat Collection 2 Level-2 Surface Reflectance and Surface Temperature products are scene-based, are produced within the standard processing system, and are made available to download directly from EarthExplorer (earthexplorer.usgs.gov). In comparison, Landsat Collection 1 Level-2 products are only available via on-demand processing (Surface...
Landsat Collection 2 Generation Timeline
Landsat Level-2 Surface Reflectance and Surface Temperature products require Landsat Collection 2 Level-1 scenes that have been processed to Tier 1 or Tier 2, as well as additional auxiliary data. For Landsat 7, the timeframe from acquisition (Real-Time (RT)) to Tier 1 or Tier 2 takes approximately 25-27 days. For Landsat 8 scenes, the timeframe...
Example of Landsat Collection 2
The fill values and scale factors of Landsat Collection 2 Level-2 products were updated to be consistent with that of Landsat Collection 2 Level-1 data, while using the unsigned integer data type more efficiently.  As shown in the table below, the fill value of the Surface Reflectance and Surface Temperature bands were changed from “-9999” in...
Landsat Collection 2 product examples
Search Landsat Collection 2 Level-1 and Level-2 products using EarthExplorer (earthexplorer.usgs.gov), which is the primary portal used to search all data held in the USGS EROS archives.   While Landsat Collection 2 products are processed and stored in the USGS Cloud Hosting Solution (CHS) environment, downloads are managed through EarthExplorer....
L8 Collection 2 Full Resolution Browse Samples: Reflective, Thermal, and Quality Band
Similar to Landsat Collection 1 LandsatLook Images, the Landsat Collection 2 Full Resolution Browse Images are .JPG and .TIF images with geographic referencing that are compressed and stretched to create an image optimized for image selection and visual interpretation. They are derived from Landsat Collection 2 Level-1 data and are available to...
National Map Viewer with draw tool open
Base map data layers in The National Map Viewer are for viewing only. This application is designed for visualizing data, combining different data layers, and creating (and printing) your own maps. To download data from The National Map, see the link at the top of the Viewer for the Data Downloader.  None of the base map layers in the Viewer are ...
Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010)
Download free global elevation data products using AppEEARS or  EarthExplorer. Free registration is required. In AppEEARS: Download Aster Global Digital Elevation Model (GDEM version 3) 1-arc-second (30m) resolution GeoTIFF format Acquired 2000-2013   In EarthExplorer, select “Digital Elevation” under the "Data Sets" tab and choose an option: ...
Color map of land use and land cover in West Africa, circa 1975
Access global land cover data using two sources on EarthExplorer: Global Land Cover Characterization (GLCC)  Select "GLCC" under "Land Cover" in the "Data Sets" tab in EarthExplorer.  Derived from 1-km Advanced Very High Resolution Radiometer (AVHRR) data collected April 1992-March 1993.  Moderate Resolution Imaging Spectroradiometer (MODIS) Land...
Screenshot from NHD Seminar 6 Presentation showing Terrain Catchments
The USGS does not require a specific format when citing data obtained through The National Map; you should follow the citation guidelines provided by instructors or publication editors as appropriate. The following should help you find the information that you need:  Citation for Datasets Author: U.S. Geological Survey Release date: the first...
Map of Fiscal Year 2020 status of 3D Elevation Program (3DEP) quality data, as of September 2020
3D Elevation Program (3DEP) product updates and status maps are available at these sites: 3DEP Product Availability 3DEP Data Acquisition Status Maps Acquire updated products through The National Map Downloader, The National Map Services, or through a bulk data request. 3D Elevation Program News The National Map Data Delivery News  Subscribe to...