Algorithm Theoretical Basis Document (ATBD)
The NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Global Food Security-support Analysis Data (GFSAD) data product provides cropland extent data of the globe for nominal year 2015 at 30 meter resolution. The monitoring of global cropland extent is critical for policymaking and provides important baseline data that are used in many agricultural cropland studies pertaining to water sustainability and food security. The GFSAD30 Validation (GFSAD30VAL) data product provides a thorough and independent accuracy assessment and validation of the cropland extent products produced for each of the seven regions. The accuracy assessment and validation process utilizes a cluster of 3 by 3 pixels of 30 meter data to resample the product to 90 meter resolution. Each GFSAD30VAL shapefile contains information on sample locations, presence of cropland or no cropland, and the zones that were randomly selected for accuracy assessment across the globe.
|File Size||~31 MB|
|Temporal Extent||2008-01-01 to 2016-12-31|
|Coordinate System||Geographic Latitude and Longitude|
|Datum||World Geodetic System (WGS84)|
|File Format||ESRI Shapefile|
|Number of Science Dataset (SDS) Layers||1|
|Columns/Rows||N/A x N/A|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
¹Additional attributes are listed on page 7 of the User Guide.
Product Quality information can be found on page 17 of the Algorithm Theoretical Basis Document (ATBD).
Known issues including constraints and limitations are provided on page 18 of the ATBD.