[GRASS-user] Landsat Data - News

Helmut Kudrnovsky hellik at web.de
Fri May 31 06:09:19 PDT 2013



*Welcome Landsat 8!*

On May 30, 2013, the checkout period was completed, and the USGS officially
became the operational manager of the Mission during an official ceremony.
The Landsat Data Continuity Mission will henceforth be known as Landsat 8.
Landsat 8 is designed for a 5-year lifespan, and carries 10 years of fuel
onboard. Data products from Landsat 8 are now available for download to all
users at no charge from EarthExplorer (http://earthexplorer.usgs.gov),
GloVis (http://glovis.usgs.gov), and the LandsatLook Viewer

*Old Metadata Format Removed!*

Since August 2012, all Landsat products have included a new metadata format
to align with operational data from the Landsat Data Continuity
Mission/Landsat 8. The historic metadata file was included to allow users
enough transition time to adjust to the new format.

Although a number of scenes will continue to have both metadata files until
the data is removed from Downloadable status and reprocessed, Landsat scenes
processed after April 29, 2013 will no longer have the “*_MTLold.txt” file.

*Landsat 8 Reflectance and Radiance Conversions!*

Standard Landsat 8 data products are delivered in 16-bit unsigned integer
format. To match data products from Landsat 1 through Landsat 7, the Landsat
8 data can be rescaled to the top-of-atmosphere (TOA) reflectance and/or
radiance using radiometric rescaling coefficients provided in the product
metadata file (MTL file). The MTL file also contains the thermal constants
needed to convert TIRS data to the at-satellite brightness temperature.

Conversion formulas to TOA Radiance, TOA Reflectance, and At-Satellite
Brightness Temperature are located at

best regards
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