GFCC30SR v001

Global Forest Cover Change (GFCC) Surface Reflectance Estimates Multi-Year Global 30 m


PI: J. Townshend

Description

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).

Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionMEaSUREs GFCC
DOI10.5067/MEaSUREs/GFCC/GFCC30SR.001
File Size~300 MB
Temporal ResolutionMulti-Year
Temporal Extent1984-03-12 to 2011-12-25
Spatial ExtentGlobal
Coordinate SystemUniversal Transverse Mercator (UTM)
DatumWorld Geodetic System (WGS84)
File FormatGeoTIFF
Geographic Dimensions170 km x 183 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers9
Columns/RowsVaries by scene
Pixel Size30 m

Layers

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 3.1.1.2 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.

Product Quality

The bit field mappings for the Landsat Surface Reflectance QA layer are provided on page 17 in the User Guide under Section 3.1.1.1, Table 3.

Additional information on Validation is provided in the User Guide under Section 5.1 on page 21.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MEaSUREs/GFCC/GFCC30SR.001

About the Image

Surface reflectance of part of Brazil, June 30, 2009.