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Landsat Analysis Ready Data (ARD) Tiles

     

      U.S. Landsat Analysis Ready Data (ARD) Tile
      Landsat 8 OLI/TIRS Surface Reflectance
      January 30, 2016, Tile ID CONUS
      Horizontal 018, Vertical 014

U.S. Landsat Analysis Ready Data (ARD) are consistently processed to the highest scientific standards and level of processing required for direct use in monitoring and assessing landscape change. A fundamental goal for Landsat ARD is to significantly reduce the magnitude of data processing for application scientists, who currently have to download and prepare large amounts of Landsat scene-based data for time-series investigative analysis.

U.S. Landsat ARD consists of surface reflectance (SR), top of atmosphere (TA) reflectance, top of atmosphere brightness temperature (BT), and quality assessment (QA) data that are consistently processed using per pixel solar zenith angle corrections, gridded to a common cartographic projection, and accompanied by appropriate metadata to enable further processing while retaining data provenance.

The current definition of Landsat ARD includes the products output of the Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) Surface Reflectance Algorithm and of the Landsat Surface Reflectance Code (LaSRC).

Landsat ARD products are available for the conterminous United States (CONUS), Alaska, and Hawaii. The data are generated in the Albers Equal Area Conic (AEA) map projection for the conterminous U.S. and Hawaii. Alaska is generated to the Alaska Albers map projection. Tiles are processed directly from Level-1 AEA scenes through Level-2 products using the World Geodetic System 1984 (WGS84) datum.

Tile Grid System

Landsat ARD products are processed to a common tiling scheme of uniform dimensions bounded by static corner points in a defined grid system.

Each tile contains 5,000 x 5,000 30-meter pixels, and includes all the pixels acquired in a given day within its extents. The ARD tile pixel dimension (number of columns and rows) is smaller than the dimensions of individual Landsat acquisitions (Landsat 8: ~6300 x ~6000 pixels; Landsat 7: ~6,166 x ~5,666 pixels).

  • 420 tiles cover the land mass extent of the conterminous United States (Figure 1).
  • 110 tiles cover the land mass extent of Alaska (Figure 2).
  • 8 tiles cover the islands of Hawaii (Figure 3).

                             
                              Figure 1. ARD Tile Grid for the Conterminous United States.     


Figure 2. ARD Tile Grid for Alaska.

Figure 3. ARD Tile Grid for Hawaii.

Digital Products

Each product is available for download through EarthExplorer for the data held in the USGS archive. Download products (.tar) are

  • Surface reflectance (SR)
  • Top of atmosphere (TA) reflectance
  • Top of atmosphere brightness temperature (BT)
  • Quality assessment (QA)
  • FGDC Metadata
  • Top of atmosphere full-resolution browse

ARD package download products include GeoTIFF formatted images, the associated pixel quality attributes, Metadata in XML format, and full-resolution browse.

Additional Information:

Data Use and Citation Policies

For information on how to cite USGS data plus guidance on usage restrictions,
please see our Data Citations and Use page at https://lta.cr.usgs.gov/citation.

Any use of trade, firm, or product names is for descriptive purposes only and
does not imply endorsement by the U.S. Government.

Contact Information for User Assistance

U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001

Phone Number: 605-594-6151
Toll Free: 800-252-4547
Fax: 605-594-6589

Email: custserv@usgs.gov
Web: https://earthexplorer.usgs.gov/

Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., Central Time