USGS EROS Archive - Earth Observing One (EO-1)
Science Center Objects
10- to 30-meter multispectral and hyperspectral data from the Earth Observing-1 (EO-1) Extended Mission. (2000 to 2017)
The Earth-Observing One (EO-1) satellite was decommissioned March 2017. The EO-1 satellite was launched on November 21, 2000 with the NASA's New Millennium Program (NMP). The NMP was an advanced-technology development program created a new generation of technologies and mission concepts into future Earth and space science missions. For more information on the final phase of the EO-1 mission go to: https://eo1.gsfc.nasa.gov/EO-1%20Phase-F%20Report%2020160617%20Final.docx. All EO-1 ALI and Hyperion historical data will continue to be available through EarthExplorer for the foreseeable future.
EO-1 Product Description
The Earth Observing-1 (EO-1) satellite was launched November 21, 2000 as a one-year technology demonstration/validation mission. After the initial technology mission was completed, NASA and the USGS agreed to the continuation of the EO-1 program as an Extended Mission. The EO-1 Extended Mission is chartered to collect and distribute Hyperion hyperspectral and Advanced Land Imager (ALI) multispectral products according to customer tasking requests.
There are three instruments on board the EO-1 spacecraft:
- Advanced Land Imager (ALI) provides image data from ten spectral bands (band designations). The instrument operates in a pushbroom fashion, with a spatial resolution of 30 meters for the multispectral bands and 10 meters for the panchromatic band. The standard scene width is 37 kilometers. Standard scene length is 42 kilometers, with an optional increased scene length of 185 kilometers (additional information).
- Hyperion collects 220 unique spectral channels ranging from 0.357 to 2.576 micrometers with a 10-nm bandwidth. The instrument operates in a pushbroom fashion, with a spatial resolution of 30 meters for all bands. The standard scene width is 7.7 kilometers. Standard scene length is 42 kilometers, with an optional increased scene length of 185 kilometers (additional information).
- Linear Etalon Imaging Spectrometer Array (LEISA) Atmospheric Corrector (LAC) provided the first space-based test of an on-board Atmospheric Corrector (AC) for increasing the accuracy of surface reflectance estimates. This data is no longer being acquired as part of the EO-1 Extended Mission (additional information).
All Hyperion and Advanced Land Imager (ALI) data in the archive will be attempted to be processed to the Level 1Gst level of correction. If the scene fails the Level 1Gst processing level, it will be removed from the archive and will become unavailable. As of June 15th, 2009, not all of the EO-1 data has been processed; please continue to check back if the scene of your interest is not available. We will be making attempts to process the failed scene as time and workload permits; however there are no guarantees that all of the EO-1 scenes will be able to be processed.
- Level 1Gst is terrain corrected and provided in 16-bit radiance values. The data are available in Geographic Tagged Image-File Format (GeoTIFF) and are distributed via download at no charge through either EarthExplorer or USGS Global Visualization Viewer (GloVis).
|Map projection||UTM (default zone of the scene center coordinates)|
|Resampling method||CC (cubic convolution)|
|Image orientation||Map (north up)|
|Pixel size||30 meter (10 meter pan band)|
|Output media||Download (no charge)|
Level 1Gst: Absolute Geodetic Accuracy Specification
The Level 1Gst product will also include terrain correction through use of a digital elevation model (DEM). This addition will correct parallax error due to topographic relief and improve the overall band-to-band registration accuracy. The elevation data used for correction consist of the Shuttle Radar Topography Mission (SRTM) "Finished" data set and other elevation data as required.
- The Level 1R data set consists of radiometrically-corrected images (watts/(sr-micron-m2)x100), formatted as HDF files, and metadata in binary and ASCII formats. Table 1 defines all Level 1 data products. Level 1 metadata filenames have an extension attached which indicates the intermediate Level 1 process (e.g., after smear correction, echo correction, dark subtraction) from which the file was generated, although the intermediate files themselves are not included on the tape. The .L1 appendage is reserved for the final, fully processed Level 1 output. The “_rX” in the file name is a revision number that allows marking of files that have been processing more than once for some reason (e.g., revised calibration file or subsetting for a specific application). The file with the .L1.hdr appendage is an ENVI-ready header for linking the band number with the band center wavelength.
Coverage Maps indicating the availability of Earth-Observing One Advanced Land Imager products are available for download.
Coverage Maps indicating the availability of Earth-Observing One Hyperion products are available for download.
All EO-1 archived product images should be previewed prior to download. Browse images of all available scenes may be viewed by searching on EarthExplorer. For an alternative "quick and easy" browse image viewer, see USGS Global Visualization Viewer (GloVis).
Each Advanced Land Imager (ALI) browse image is generated from the Level 1 data and displayed as a 4,3,1 (RGB) band combination. Each band is linearly stretched between the 1% and 97% histogram values. The data is also reduced by a factor of 8 in each direction and jpeg compressed with a quality of 75%.
Each Hyperion browse image is created from the Level 0 (raw) data and displayed as a RGB (40:31:13) band combination. Hyperion browses have had the dark calibration subtracted and the gains have been applied. Each band is linearly stretched between the 1% and 97% histogram values. The data is then scaled from 12 bits to 8 bits. Finally, the data is reduced by a factor of 4 in each direction and jpeg compressed with a quality of 75%.