OrbView-2 Product Information
GeoEye offers several products from OrbView-2, the satellite that carries the Sea Viewing Wide Field of View Sensor (SeaWiFS). Customers can purchase the right to download data directly from the satellite via their own HRPT ground station, or they may purchase lower-level data sets directly from GeoEye which contain measurements from all eight spectral bands. Alternatively, users can purchase derived environmental products like Chlorophyll-a concentration.
OrbView-2 Product Summary:
|
Product |
Data Layers |
Geographic Size |
File Size |
Availability |
Price |
Basic Data Sets |
|
Level-1A (HDF) |
8 |
1,500+ x 2,800 km |
28 MB |
3 days |
$500 * |
|
Level-1B (HDF) |
8 |
1,500+ x 2,800 km |
28 MB |
3 days |
$500 * |
|
Level-2 (HDF) |
Varies |
1,500+ x 2,800 km |
31 MB |
3 days |
$500 * |
|
Direct Downlink Licenses |
8 |
2,200 km Radius |
100 MB/pass |
Real-Time |
$100,000/yr |
|
Chlorophyll-a |
|
Image |
1 |
512 x 512 km |
100 KB |
3 days |
$500 * |
|
Data Set |
1 |
512 x 512 km |
1 MB |
3 days |
$500 * |
* - Price for single-user license only
GEOEYE HAS THE EXCLUSIVE, WORLDWIDE RIGHT TO USE ORBVIEW-2 (SEAWIFS) DATA COMMERCIALLY. THE COMMERCIAL USE AND SALE OF ORBVIEW-2 (SEAWIFS) DATA OR ANY PRODUCTS DERIVED FROM ORBVIEW-2 (SEAWIFS) IS PROHIBITED WITHOUT THE EXPRESS WRITTEN PERMISSION OF GEOEYE.
|
OrbView-2 Basic Data Sets
Each OrbView-2 basic data set comprises a coverage area of 1,500+ x 2,800 km, has a 1.13 km spatial resolution at nadir, and includes imaging information from all eight channels of the OrbView-2 imaging instrument. The Basic Data Sets are not map projected or geo-corrected although they include the necessary telemetry data to do so. OrbView-2 basic data sets can be browsed at http://oceancolor.gsfc.nasa.gov/cgi/browse.pl).
Basic OrbView-2 data sets can be Level-1 or Level-2 data in HDF format, compatible with NASA's free SeaDAS image processing software (available for download at http://seadas.gsfc.nasa.gov/seadas/), as well as most commercial image processing software as ‘Generic HDF’ format.
Level 1A (L1A): Reconstructed, unprocessed instrument data at full resolution, including radiometric and geometric calibration coefficients and georeferencing parameters (i.e., platform ephemeris) computed and appended, but not applied to the L0 data.
Level 1B (L1B): At-sensor Top-of-the-Atmosphere radiances derived by applying the sensor calibration to the Level 1A sensor counts at the same resolution and location as the Level 1A data.
Level 2 (L2): Atmospheric corrections are applied to derive geo-physical variables at the same resolution and location as the L1 data, for example normalized water-leaving radiances for each of the 8 bands. Currently supported derived variables are described at: http://oceancolor.gsfc.nasa.gov/DOCS/MSL12/MSl12_prod.html.
Chlorophyll Products
Chlorophyll is the green pigment found in plants, including marine phytoplankton, and is an indicator of total plant biomass. Phytoplankton biomass is an important indicator for understanding the coastal environment, biological oceanography, trophic balances, world carbon cycles and global change.
The Chlorophyll-a product is a 1.13 km resolution data set or image using water leaving radiances to estimate Chlorophyll-a concentrations in aquatic phytoplankton. In the image product, the data are displayed as a color image that highlights the full range of concentrations. In the data set product, the Chlorophyll-a concentrations in mg/m³, latitude and longitude are provided in an HDF (Hierarchical Data Format) file.
The algorithms that calculate the Chlorophyll-a concentrations from band radiances are based on oceanographic research before and during the OrbView-2 mission. Chlorophyll-a concentrations in the standard products are derived from the OC-4v4 algorithm, following the SeaWiFS program reprocessing #3 specifications. Alternative algorithms, if requested by the customer, may be available.
Chlorophyll-a Product Specifications:
|
Product Information |
Description |
Comments |
|
Ground Sample Distance |
0.82 meter x 3.2 meters |
at nadir over equator |
|
Spectral Content |
single band algorithm result |
N/A |
|
Data Type |
SeaWiFS HRPT |
GAC (4.4 km data is possible) |
| Dynamic Range |
8 bit |
N/A |
|
Geometric Accuracy |
+ / - 4.4 km |
N/A |
|
Geographic Coverage |
5.5 x 5.5 degrees |
512 x 512 pixels |
|
File Size |
100 Kb - 1 MB |
depends on file format |
|
Datum |
sphere |
N/A |
|
Map Projection |
Equal - Distant Cylindrical |
Optional Mercator projection |
|
Data Processing Software |
SeaDAS v5.2 |
N/A |
|
Chlorophyll-a Algorithm |
OC4 ver 4 |
N/A |
|
File Format |
data set or image |
hdf, bin, ascii, gif or tif |
|
Delivery Media |
CD, e-mail or FTP |
N/A |
|
Delivery Schedule-Shipped |
Within 3 days |
Large orders of multiple scenes will take longer to process |
Direct Downlink Licenses
For customers who wish to access large amounts of OrbView-2 data in real-time, we offer direct downlink licenses. The license enables commercial customers to directly receive OrbView-2 data with their own high-resolution picture transmission (HRPT) antenna. A single license provides daily OrbView-2 coverage over a circular region with an approximate radius of 2,200 km.
SeaStar Fisheries Information Service
For more information, click here .
Contact Information
› Please click here to request more information about our OrbView-2 products.
› Please click here for more information on SeaWiFS Research Discount Offer.