Global Forest Cover Change (GFCC) surface reflectance data from the GFCC30SR product over Brazil, June 30, 2009.View full-size image
The Land Processes Distributed Active Archive Center (LP DAAC) archives and distributes Global Forest Cover Change (GFCC) data products through the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program. The GFCC Surface Reflectance Estimates Multi-Year Global dataset is derived from the enhanced Global Land Survey (GLS) datasets for epochs centered on the years 1990, 2000, 2005, and 2010. The GLS datasets are composed of Landsat 5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+) images at 30 meter resolution. Data available for this product represent the best available “leaf-on” date during the peak growing season. The original GLS datasets were enhanced with supplemental Landsat images when data were incomplete for the epoch or inadequate for analysis due to acquisition during “leaf-off” seasons. The enhanced GLS data were acquired June 1984 through August 2011. Atmospheric corrections were applied to seven visible bands to estimate surface reflectance by compensating for the scattering and absorption of radiance by atmospheric conditions. GFCC30SR is a multi-file data product. The surface reflectance data products are used as source data for other datasets in the GFCC collection.
For each available date, data files are delivered in a zip folder that consists of six surface reflectance bands, a Top of Atmosphere temperature band, an Atmospheric Opacity layer, and the Landsat Surface Reflectance Quality layer. Data follow the Worldwide Reference System-2 tiling scheme. Additional details regarding the methodology used to create the data are available in the Algorithm Theoretical Basis Document (ATBD).
|File Size||~300 MB|
|Temporal Extent||1984-03-12 to 2011-12-25|
|Coordinate System||Universal Transverse Mercator (UTM)|
|Datum||World Geodetic System (WGS84)|
|Geographic Dimensions||170 km x 183 km|
|Number of Science Dataset (SDS) Layers||9|
|Columns/Rows||Varies by scene|
|Pixel Size||30 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
|SR.b01¹||Band 1 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b02||Band 2 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b03||Band 3 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b04||Band 4 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b05||Band 5 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b07||Band 7 Surface Reflectance||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.b06||Band 6 Top of Atmosphere Temperature||°C||16-bit signed integer||-9999||N/A||-7000 to 7000||0.01|
|SR.AO||Atmospheric Opacity of Band 1||N/A||16-bit signed integer||-9999||N/A||-2000 to 16000||0.0001|
|SR.QA²||Landsat Surface Reflectance Quality Layer||N/A||16-bit signed integer||-1||N/A||0 to 32767||N/A|
¹ Section 184.108.40.206 on page 18 of the User Guide provides information on the naming convention of the files. ² Table 3 on page 17 in the User Guide provides quality flag information.
The bit field mappings for the Landsat Surface Reflectance QA layer are provided on page 17 in the User Guide under Section 220.127.116.11, Table 3.
Additional information on Validation is provided in the User Guide under Section 5.1 on page 21.