https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.8 2026-04-29T10:52:37.449Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/769780b8-ba0e-4cd2-9575-88953c1010a0 SeaWiFS Date=2019-02-22 User Id=mmorahan Entity=Resource Operation=UPDATE Field=type System Note=update Resource Old Value=IMAGE New Value=image Date=2021-03-10 User Id=sritz Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 7906156a-dcf2-4078-b0fc-d4134eb08e87 relationship type: null relationship value: null generated by: null Date=2021-03-10 User Id=sritz Entity=AltLabel Operation=UPDATE Field=text System Note=update AltLabel Old Value=SeaWiFS New Value=SEAWIFS Date=2020-01-29 User Id=sritz Entity=AltLabel Operation=INSERT System Note=insert AltLabel New Value=id: null category: null text: SeaWiFS language code: en Date=2020-01-29 User Id=sritz Entity=Resource Operation=UPDATE Field=url System Note=update Resource Old Value=http://oceancolor.gsfc.nasa.gov/SeaWiFS/SEASTAR/seawifs_bench.gif New Value=https://oceancolor.gsfc.nasa.gov/SeaWiFS/SEASTAR/seawifs_bench.gif Date=2021-03-10 User Id=sritz Entity=WeightedRelation Operation=UPDATE Field=relationshipValue System Note=update WeightedRelation Old Value=null New Value=1.0 Date=2021-03-10 User Id=sritz Entity=PrefLabel Operation=UPDATE Field=text System Note=update PrefLabel Old Value=SEAWIFS New Value=SeaWiFS Date=2021-03-10 User Id=sritz Entity=Definition Operation=UPDATE Field=reference System Note=update Definition New Value=https://oceancolor.gsfc.nasa.gov/SeaWiFS/ Date=2020-01-29 User Id=sritz Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=The SeaWiFS instrument was launched by Orbital Sciences Corporation on the OrbView-2 (a.k.a. SeaStar) satellite in August 1997, and collected data from September 1997 until the end of mission in December 2010. SeaWiFS had 8 spectral bands from 412 to 865 nm. It collected global data at 4 km resolution, and local data (limited onboard storage and direct broadcast) at 1 km. The mission and sensor were optimized for ocean color measurements, with a local noon (descending) equator crossing time orbit, fore-and-aft tilt capability, full dynamic range, and low polarization sensitivity. The SeaWiFS instrument has scanning mechanisms to drive an off-axis folded telescope and a rotating halfangle mirror. Incoming scene radiation is collected by the folded telescope and reflected onto the rotating half-angle mirror. The collected radiation is then relayed through dichroic beam splitters to separate the radiation into four wavelength intervals each wavelength interval encompassing two of the eight SeaWiFS spectral bands. Four corresponding aft-optics direct the radiation in the four separate wavelength intervals through two separate spectral band-pass filters that further separate the radiation into eight SeaWiFS spectral bands. The aft-optics assemblies also image each of the resultant defined bands of radiation onto four detectors that are aligned in the scan direction. Monitoring of sensor calibration over periods of a few orbits, to several months or years, is accomplished using solar calibration for the former and lunar calibration for the latter. Solar calibration uses a solar-radiation diffuser and an input port located in a fixed position outside of the 58.3 degree SeaWiFS scene-scan interval. Lunar calibration is accomplished by a spacecraft maneuver to view the moon when the spacecraft is in the nighttime portion of its orbit. Key SeaWiFS Facts Scan Width: 58.3 deg (LAC); 45.0 deg (GAC) Scan Coverage: 2,800 km (LAC); 1,500 km (GAC) Pixels along Scan: 1,285 (LAC); 248 (GAC) Nadir Resolution: 1.13 km (LAC); 4.5 km (GAC) Scan Period: 0.124 seconds Tilt: -20, 0, +20 deg Digitization: 10 bits (LAC stands for Local Area Coverage; GAC stands for Global Area Coverage) Group: Instrument_Details Entry_ID: SEAWIFS Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: SEAWIFS Long_Name: Sea-Viewing Wide Field-of-View Sensor End_Group Group: Associated_Platforms Short_Name: SEASTAR End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible Number_Channels: 6 channels Spectral_Frequency_Coverage_Range: 0.4 - 0.7 micrometers End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Near Infrared Number_Channels: 2 channels Spectral_Frequency_Coverage_Range: 0.765 - 0.865 micrometers End_Group Online_Resource: http://oceancolor.gsfc.nasa.gov/SeaWiFS/ Online_Resource: http://oceancolor.gsfc.nasa.gov/ Sample_Image: http://oceancolor.gsfc.nasa.gov/SeaWiFS/SEASTAR/seawifs_bench.gif Creation_Date: 2007-04-16 Group: Instrument_Logistics Instrument_Start_Date: 1997-09-01 Instrument_Stop_Date: 2010-12-11 Instrument_Owner: USA/NASA End_Group End_Group New Value=[SeaWiFS collected data from September 1997 until the end of its mission in December 2010] The SeaWiFS instrument was launched by Orbital Sciences Corporation on the OrbView-2 (a.k.a. SeaStar) satellite in August 1997, and collected data from September 1997 until the end of mission in December 2010. SeaWiFS had 8 spectral bands from 412 to 865 nm. It collected global data at 4 km resolution, and local data (limited onboard storage and direct broadcast) at 1 km. The mission and sensor were optimized for ocean color measurements, with a local noon (descending) equator crossing time orbit, fore-and-aft tilt capability, full dynamic range, and low polarization sensitivity. The SeaWiFS instrument has scanning mechanisms to drive an off-axis folded telescope and a rotating halfangle mirror. Incoming scene radiation is collected by the folded telescope and reflected onto the rotating half-angle mirror. The collected radiation is then relayed through dichroic beam splitters to separate the radiation into four wavelength intervals each wavelength interval encompassing two of the eight SeaWiFS spectral bands. Four corresponding aft-optics direct the radiation in the four separate wavelength intervals through two separate spectral band-pass filters that further separate the radiation into eight SeaWiFS spectral bands. The aft-optics assemblies also image each of the resultant defined bands of radiation onto four detectors that are aligned in the scan direction. Monitoring of sensor calibration over periods of a few orbits, to several months or years, is accomplished using solar calibration for the former and lunar calibration for the latter. Solar calibration uses a solar-radiation diffuser and an input port located in a fixed position outside of the 58.3 degree SeaWiFS scene-scan interval. Lunar calibration is accomplished by a spacecraft maneuver to view the moon when the spacecraft is in the nighttime portion of its orbit. Key SeaWiFS Facts Scan Width: 58.3 deg (LAC); 45.0 deg (GAC) Scan Coverage: 2,800 km (LAC); 1,500 km (GAC) Pixels along Scan: 1,285 (LAC); 248 (GAC) Nadir Resolution: 1.13 km (LAC); 4.5 km (GAC) Scan Period: 0.124 seconds Tilt: -20, 0, +20 deg Digitization: 10 bits (LAC stands for Local Area Coverage; GAC stands for Global Area Coverage) Additional Information: https://oceancolor.gsfc.nasa.gov/SeaWiFS/ Group: Instrument_Details Entry_ID: SEAWIFS Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: SEAWIFS Long_Name: Sea-Viewing Wide Field-of-View Sensor End_Group Group: Associated_Platforms Short_Name: SEASTAR End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible Number_Channels: 6 channels Spectral_Frequency_Coverage_Range: 0.4 - 0.7 micrometers End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Near Infrared Number_Channels: 2 channels Spectral_Frequency_Coverage_Range: 0.765 - 0.865 micrometers End_Group Online_Resource: https://oceancolor.gsfc.nasa.gov/SeaWiFS/ Online_Resource: https://oceancolor.gsfc.nasa.gov/data/seawifs/ Sample_Image: https://oceancolor.gsfc.nasa.gov/SeaWiFS/SEASTAR/seawifs_bench.gif Creation_Date: 2007-04-16 Group: Instrument_Logistics Instrument_Start_Date: 1997-09-01 Instrument_Stop_Date: 2010-12-11 Instrument_Owner: USA/NASA End_Group End_Group Date=2019-02-22 User Id=mmorahan Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: aef85316-b8f8-422a-add0-8130b113fa7d relationship type: null relationship value: null generated by: null [SeaWiFS collected data from September 1997 until the end of its mission in December 2010]The SeaWiFS instrument was launched by Orbital Sciences Corporation on the OrbView-2 (a.k.a. SeaStar) satellite in August 1997, and collected data from September 1997 until the end of mission in December 2010. SeaWiFS had 8 spectral bands from 412 to 865 nm. It collected global data at 4 km resolution, and local data (limited onboard storage and direct broadcast) at 1 km. The mission and sensor were optimized for ocean color measurements, with a local noon (descending) equator crossing time orbit, fore-and-aft tilt capability, full dynamic range, and low polarization sensitivity.The SeaWiFS instrument has scanning mechanisms todrive an off-axis folded telescope and a rotating halfanglemirror. Incoming scene radiation is collectedby the folded telescope and reflected onto the rotatinghalf-angle mirror. The collected radiation is then relayedthrough dichroic beam splitters to separate the radiationinto four wavelength intervals each wavelength intervalencompassing two of the eight SeaWiFS spectral bands.Four corresponding aft-optics direct the radiation in thefour separate wavelength intervals through two separatespectral band-pass filters that further separate the radiationinto eight SeaWiFS spectral bands. The aft-opticsassemblies also image each of the resultant defined bandsof radiation onto four detectors that are aligned in the scandirection. Monitoring of sensor calibration over periods ofa few orbits, to several months or years, is accomplishedusing solar calibration for the former and lunar calibrationfor the latter. Solar calibration uses a solar-radiationdiffuser and an input port located in a fixed positionoutside of the 58.3 degree SeaWiFS scene-scan interval. Lunarcalibration is accomplished by a spacecraft maneuver toview the moon when the spacecraft is in the nighttimeportion of its orbit.Key SeaWiFS FactsScan Width: 58.3 deg (LAC); 45.0 deg (GAC)Scan Coverage: 2,800 km (LAC); 1,500 km (GAC)Pixels along Scan: 1,285 (LAC); 248 (GAC)Nadir Resolution: 1.13 km (LAC); 4.5 km (GAC)Scan Period: 0.124 secondsTilt: -20, 0, +20 degDigitization: 10 bits(LAC stands for Local Area Coverage; GAC stands for Global AreaCoverage)Additional Information: https://oceancolor.gsfc.nasa.gov/SeaWiFS/Group: Instrument_Details Entry_ID: SEAWIFS Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: SEAWIFS Long_Name: Sea-Viewing Wide Field-of-View Sensor End_Group Group: Associated_Platforms Short_Name: SEASTAR End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible Number_Channels: 6 channels Spectral_Frequency_Coverage_Range: 0.4 - 0.7 micrometers End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Near Infrared Number_Channels: 2 channels Spectral_Frequency_Coverage_Range: 0.765 - 0.865 micrometers End_Group Online_Resource: https://oceancolor.gsfc.nasa.gov/SeaWiFS/ Online_Resource: https://oceancolor.gsfc.nasa.gov/data/seawifs/ Sample_Image: https://oceancolor.gsfc.nasa.gov/SeaWiFS/SEASTAR/seawifs_bench.gif Creation_Date: 2007-04-16 Group: Instrument_Logistics Instrument_Start_Date: 1997-09-01 Instrument_Stop_Date: 2010-12-11 Instrument_Owner: USA/NASA End_GroupEnd_Group 2021-03-10 17:23:22.0