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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).
The following products and services are available:
- Data Acquisition Requests (DARs) must be submitted in order to collect a requested image for a specific area of interest. There will be a $750 service fee for tasking the sensor(s). The fee will also cover the labor required to support the scheduling, tracking, and quality assessment of a DAR.
- 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.
For Hyperion data, the following levels of correction are available:
- Level 1R is radiometrically corrected with no geometric correction applied. The image data are provided in 16-bit radiance values. The data are available in Hierarchical Data Format (HDF) and are distributed on DVD, and File Transfer Protocol (FTP).
- Level 1Gst is terrain corrected and provided in 16-bit radiance values. The data are available in Hierarchical Data Format (HDF) or Geographic Tagged Image-File Format (GeoTIFF) and are distributed on DVD and File Transfer Protocol (FTP).
For Advanced Land Imager (ALI) data, the following levels of correction are available:
- Level 1R radiometrically corrected with no geometric correction applied. The image data are provided in 16-bit radiance values. The data are available in Hierarchical Data Format (HDF) and are distributed on DVD, and File Transfer Protocol (FTP).
- Level 1Gs is geometrically corrected and will be provided as a single "stitched" file. The image data are provided in 16-bit radiance values. The data are available in Hierarchical Data Format (HDF) or Geographic Tagged Image-File Format (GeoTIFF) and are distributed on DVD and File Transfer Protocol (FTP).
- Level 1Gst is terrain corrected and will be provided as a single "stitched" file. The image data are provided in 16-bit radiance values. The data are available in Hierarchical Data Format (HDF) or Geographic Tagged Image-File Format (GeoTIFF) and are distributed on DVD and File Transfer Protocol (FTP).
The Level 1Gs and Level 1Gst products will be distributed with the following standardized set of processing parameters:
| Map projection |
UTM (default zone of the scene center coordinates)
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| Horizontal Datum |
WGS84 |
| Resampling method |
CC (cubic convolution) |
| Image orientation |
Map (north up)
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| Pixel size |
30 meter (10 meter pan band) |
| Format |
HDF or GeoTIFF
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| Output media |
FTP or DVD |
Level 1Gs and Level 1Gst: Absolute Geodetic Accuracy Specification
The Level 1Gs product should be accurate to within 250 meters in flat areas at mean sea level. The L1Gs product does not employ ground control or relief models to obtain absolute geodetic accuracy. Landscape parameters (elevation and relief) along with spacecraft/instrument limitations (sensor look angle, ephemeris, attitude, alignment knowledge) will impact the overall accuracy of the L1Gs product. Geometric calibrations of the satellite and sensor are on-going. As a result, the absolute geodetic accuracy may improve with future releases of the L1Gs processing system.
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.
Additional Information:
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Prices
Data Acquisition Request (DAR)
There will be a $750 service fee for tasking the sensor(s) to collect the requested image. The fee also covers the labor required to support the scheduling, tracking, and quality assessment of a DAR.
Data Product
The cost per scene for a data product is:
| Data Product |
Cost |
| Hyperion – Radiometrically corrected (Level 1R) |
$250 |
| Hyperion – Terrain corrected (Level 1Gst) |
$500 |
| ALI – Radiometrically corrected (Level 1R) |
$250 |
| ALI – Geometrically corrected (Level 1Gs) |
$500 |
| ALI – Terrain corrected (Level 1Gst) |
$500 |
Search & Order
Data Products
All publicly available data products (ALI and Hyperion) may be searched and ordered on Earth Explorer 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 Acquisition Request (DAR)
Following are the two orders that are placed for each DAR requested:
Service fee: This fee is for tasking of the sensor(s) to collect the requested image. The fee also covers the labor required to support the scheduling, tracking, and quality assessment of a DAR.
Once EROS has received allocated funding for a DAR (i.e. a Purchase Order set aside for the DAR billing at a later date or credit card information), the request will be added to the schedule.
The amount of time between receipt of allocated funds and image acquisition will depend on the customer's requested acquisition date range, satellite scheduling conflicts, and satellite maintenance. If we are unable to image a specific location, the customer will be notified.
After EO-1 has imaged the DAR location and upon receipt of the data, EROS will perform a cloud cover assessment over the entire image. If the image has less than 20% cloud cover, the DAR will be considered fulfilled and we will bill the $750 service fee. A browse image will be sent to you by email for your review and upon your approval, the data product will be generated and shipped. If the image has greater than 20% cloud cover, EROS will reschedule the target scene up to two additional times at no extra cost. - Data product: This order is processed and shipped after you have reviewed the browse image and notified EROS to proceed. Please note that you are not required to purchase the data product as part of the original data acquisition request. If you have wired money for both orders and you choose not to purchase the data product, we will refund the data product amount or you can choose to have it on deposit with EROS toward a future purchase.
A typical timeline for EO-1 data to be downlinked to a remote ground station, received at EROS, processed, and distributed to the customer is approximately one to four weeks.
Image Previews
All EO-1 archived product images should be previewed prior to purchase. Browse images of all available scenes may be viewed by searching on EarthExplorer. For an alternative "quick and easy" browse image viewer, see 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(Band designations: Level 1R vs Level 1G). 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%.
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EO-1 full resolution, sample data consisting of selected ALI and Hyperion scenes may be downloaded at no charge.
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