Global Land Surveys (GLS)
The U.S. Geological Survey (USGS) and NASA have collaborated on the creation of the Global Land Surveys (GLS) data sets.
Each GLS data set was created using the primary Landsat sensor in use at the time:
- GLS1970: uses Multispectral Scanner (MSS) data
- GLS1990 : uses Landsat 4-5 Thematic Mapper (TM) data
- GLS2000: uses Landsat 7 Enhanced Thematic Mapper Plus (ETM+) data
- GLS2005: uses a combination of Landsat TM and ETM+ data
- GLS2010: uses a combination of Landsat TM and ETM+ data
The Landsat data incorporated into each GLS data set meets quality and cloud cover standards, and is processed to the following parameters:
- Data Resolution (Reflective bands): 30 meters (Landsat MSS: 60 meters)
- Data Format: GeoTIFF (Level 1 product), Full-resolution .jpg (LandsatLook images)
- Resampling: Cubic Convolution
- Projection: Universal Transverse Mercator (UTM)
- Datum: WGS84
All GLS data sets are scene-based, and can be searched and downloaded at no charge from EarthExplorer or GloVis.