Hyperion Systematic Terrain-Corrected (Level 1Gst) Data Product

 

The United States Geological Survey (USGS) Center for Earth Resources Observation and Science (EROS), in cooperation with NASA, is pleased to announce the release of a new Systematic Terrain-Corrected (Level 1Gst) data product from the Earth Observing-1 (EO-1) Hyperion sensor. This new processing option provides increased quality and improved geometric accuracy for the Hyperion data product. In the past, the Hyperion image product consisted of L1R (radiometrically corrected) data only.

The new Hyperion Level 1Gst product includes automated terrain correction based on a digital elevation model (DEM), which serves to correct parallax error due to local elevation and topographic relief. This includes radiometric calibration and geometric correction using satellite ephemeris information.

For most products, the elevation data used for correction will consist of the Shuttle Radar Topography Mission (SRTM) 'Finished' product, with void filling of the SRTM elevation data applied when necessary. SRTM void filling is accomplished by interpolating surrounding elevation values using a distance weighted average algorithm. The Global 30-Arc Second Elevation Data Set (GTOPO30) will be used for scenes that include a large gap in the SRTM coverage. The new L1Gst product does not include the use of ground control points (GCPs).

Hyperion is the first civilian spaceborne hyperspectral imager and acquires data in 220 10-nanometer bands covering the visible, near, and shortwave-infrared ranges. The L1Gst product is georeferenced to the Universal Transverse Mercator (UTM) projection using the WGS84 datum. The data product is delivered in 30-meter pixels, and processed using the cubic convolution (CC) resampling kernel. The data is distributed on DVD or FTP in either GeoTIFF or HDF (4.1r5) format.

The new Hyperion product is available for $500 per scene, and may be searched and ordered through Earth Explorer (http://earthexplorer.usgs.gov) or the USGS Global Visualization Viewer (http://glovis.usgs.gov).