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... > Instruments > Earth Remote Sensing Instruments > Passive Remote Sensing > Spectrometers/Radiometers > Imaging Spectrometers/Radiometers > OCTS

Preferred term

OCTS  

Definition

  • OCTS is an optical radiometer devoted to the frequent global measurement of ocean color and sea surface temperature. OCTS will show the amount of chlorophyll and dissolved substances in the water, and temperature distribution. OCT's data will be used for determination of ocean primary production and carbon cycle, and be used for getting the information of ocean conditions for fishery and environment monitoring etc. OCTS is a successor to CZCS(Coastal Zone Color Scanner), the U.S. projects, which was the first real optical sensor for ocean observation onboard NIMBUS-7 launched in 1978. OCTS has 8 bands in visible and near-infrared region and 4 bands in thermal region, and achieves highly sensitive spectral measurement with these bands. The observation bands are determined on the characteristics of spectral reflectance of the object substances, atmosheric windows and atmospheric correction. The spatial resolution is about 700m. This is applicable to the observation of coastal zone and land, the feature of these area baries quickly compared to the open ocean. As the swathwidth is about 1400km on the ground, OCTS can observe the same area every 3 days and can monitor rapidly changing phenomena. OCTS has optical calibration function using solar light and halogen lamp as the calibration source. OCTS has two data trasmission modes. All raw pixel data are transmitted through X band with fine data transmission mode. One pixel data is sampled from every 6x6km area as typical data of the area and is transmitted at UHF band in coarse data transmission mode. OCTS consists of scanning radiometer unit, which contains optical system and detector module, and-electrical unit. OCTS adopts catoptric optical system and mechanical rotating scanning method using mirror. this is because OCTS covers wide range of wavelength and wide scanning angles. OCTS can tilt its line of sight along the track to prevent the sunglitter at the sea surface from interrupting the observation. For high sensitivity, each band has 10pixels aligned to the track. The infrared detectors are cooled at 100k by a large rediant cooler facing the deep space. For more information see: "http://www.eorc.nasda.go.jp/ADEOS/Project/Octs.html" Group: Instrument_Details Entry_ID: OCTS 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: OCTS Long_Name: Ocean Color and Temperature Scanner End_Group Group: Associated_Platforms Short_Name: ADEOS-I End_Group End_Group (en)

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Change note

  • 2022-12-01 13:19:58.0 [tstevens] insert WeightedRelation (id: null related concept uuid: 359bcfa1-966f-4d2b-a48d-ac12165d250f relationship type: null relationship value: null generated by: null);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/ff49e220-7ca6-44c9-80df-b48b31a62cb6

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