| definition |
- SPOT (Satellite Probatoire d'Observation de la Terre) is the French government sponsored civil Earth observation program, with support from Belgium and Sweden. A single SPOT satellite provides complete coverage of the Earth every 26 days. Image products from SPOT are handled by a commercial entity, SPOT-Image Corp. Spacecraft:
3-Axis stabilized. Single 5-panel solar array, each panel is 2.6 x 1.9 m. Hydrazine propulsion system provides orbit maintenance. Payload: Two HRVIR (High Resolution Visible - Infrared) pushbrrom imaging instruments are carried. HRVIR is derived from the HRV instruments on SPOT 1-3. This system will provide 10 m resolution in the panchromatic band and 20 m resolution in the multispectral bands. HRVIR includes a new medium IR channel to support vegetation analysis and harvest forecasting. The HRVIRs are steerable to within 27 deg off-nadir. Each HRVIR has a swath width of 60 km. The Vegetation Monitoring instrument has 1 km resolution in the same bands as the HRVIR. PASTEL optical link terminal supports laser crosslink experiments. DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) precision orbit determination system. Additional information available at "http://samadhi.jpl.nasa.gov/msl/QuickLooks/spot4QL.html"
[Summary provided by NASA]
Group: Platform_Details Entry_ID: SPOT-4 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: SPOT Short_Name: SPOT-4 Long_Name: Systeme Probatoire Pour l'Observation de la Terre-4 End_Group Group: Synonymous_Platform_Names Short_Name: 25260 End_Group Group: Platform_Associated_Instruments Short_Name: DORIS Short_Name: VEGETATION-1 Short_Name: POAM III Short_Name: HRVIR Short_Name: HRV End_Group Group: Orbit Orbit_Altitude: 832 km Orbit_Inclination: 98.8° Equator_Crossing: 10:30 local solar time Period: 100.9 minutes Repeat_Cycle: 26 days Perigee: 791.0 km Apogee: 811.0 km Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous End_Group Creation_Date: 2008-08-20 Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1998-017A Online_Resource: http://www.astrium-geo.com/ Online_Resource: http://earth.esa.int/object/index.cfm?fobjectid=4074 Sample_Image: http://ceos.cnes.fr:8100/cdrom-98/ceos1/satellit/spotsys/spot4_gb/images/orbite/spot4044.gif Group: Platform_Logistics Launch_Date: 1998-03-24 Launch_Site: Kourou, French Guiana Design_Life: 4 Years Primary_Sponsor: France/CNES End_Group End_Group
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