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EO-1 (Earth Observing-1)

  

   ALI sample image 6,5,4 (RGB)
   Mt Fuji, Japan

  

   Hyperion sample image 215,54,18
   Mt Fuji, Japan                                                

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).

The following products and services are available:

  • Data Acquisition Requests (DARs) must be submitted online in order to collect a requested image for a specific area of interest. Please realize that scheduling conflicts and satellite maintenance may affect instrumental availability and there are no guarantees of acquisition. This is a low volume satellite and only one scene per path may be acquired.

The USGS, in partnership with NASA, is providing a mechanism for the general public to specify location and timeframe for future acquisitions of data from the EO-1 satellite. There will be no charge for these tasking requests and they will be satisfied on a best effort basis as capacity is potentially available from EO-1. Users submitting tasking requests will be notified by email when their request has been completed, which is either when the area of interest was acquired or the acquisition window has expired. For further details, please reference the detailed procedure for selection posted at EO-1 USGS Tasker Help Page.

  • Data products consist of imagery collected during the original one-year technology demonstration/validation mission, as well as more recent collects from the subsequent EO-1 Extended Mission period to date. Data products are available to download at no charge.

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 GloVis.
Map projection UTM (default zone of the scene center coordinates)
Horizontal Datum WGS84
Resampling method CC (cubic convolution)
Image orientation Map (north up)
Pixel size 30 meter (10 meter pan band)
Format GeoTIFF
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.

Differences Between Level 1R and Level 1A Hyperion Data Sets (.pdf)
*Level 1R is referred to as Level 1 in PDF

Data Acquisition Requests (DARs) must be submitted online in order to collect a requested image for a specific area of interest. Please realize that scheduling conflicts and satellite maintenance may affect instrumental availability and there are no guarantees of acquisition. This is a low volume satellite and only one scene per path may be acquired.

All publicly available data products (ALI and Hyperion) may be searched and downloaded on EarthExplorer or GloVis. Please note that EO-1 does not acquire data continuously and its sensors are only activated to collect specific scenes upon request. Many locations may therefore not be available.

Data Use and Citation Policies

For information on how to cite USGS data plus guidance on usage restrictions,
please see our Data Citations and Use page at https://lta.cr.usgs.gov/citation.

Contact Information for User Assistance

Long Term Archive User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001

Phone Number: 605-594-6151
Toll Free: 800-252-4547
Fax: 605-594-6589

Email:lta@usgs.gov
Web: https://lta.cr.usgs.gov

Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., Central Time