@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed>
  skos:prefLabel "Photometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/5e498269-5d5c-4006-b692-f031ff3e160e> .

<https://gcmd.earthdata.nasa.gov/kms/concept/5e498269-5d5c-4006-b692-f031ff3e160e>
  ns0:altLabel [ ] ;
  skos:definition """The Polar Ozone and Aerosol Measurement II (POAM II) instrument was developed by the Naval Research Laboratory (NRL) to measure the vertical distribution of atmospheric ozone, water vapor, nitrogen dioxide, aerosol extinction, and temperature. POAM II measures solar extinction in nine narrow band channels, covering the spectral range from approximately 350 to 1060 nm. 

POAM II was launched aboard the French  SPOT-3 satellite on 26 september, 1993 into a Sun synchronous polar orbit. As seen from the satellite, the Sun rises in the north polar region and sets in the south polar region 14.2 times per day. Sunrise measurements are made in a latitude band from 55-71 degrees north while sunsets occur between 63-88 degrees south. 

Further details about the POAM II instrument can be found in  Glaccum, et al. [1996]. The POAM II mission was interrupted by the failure of the SPOT-3 satellite in November of 1996. A follow-on instrument, POAM III, was subsequently launched on the SPOT-4. satellite in March 1998 and is currently operational.

Reference:
"The Polar Ozone and Aerosol Measurement (POAM II) Instrument", W.Glaccum,
R.Lucke, R.M.Bevilacqua, E.P.Shettle, J.S.Hornstein, D.T.Chen, J.D.Lumpe,
S.S.Krigman, D.J.Debrestian, M.D.Fromm, F.Dalaudier, E.Chassefiere, C.Deniel,
C.E.Randall, D.W.Rusch, J.J.Olivero, C.Brogniez, J.Lenoble, & R.Kremer, J.
Geophys. Res., 101, 14,479-14,487, 1996.

For more information, see: http://www.nrl.navy.mil/rsd/7220/poam


Group: Instrument_Details
   Entry_ID: POAM II
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Passive Remote Sensing
      Instrument_Type: Photon/Optical Detectors
      Instrument_Subtype: Photometers
      Short_Name: POAM II
      Long_Name: Polar Ozone and Aerosol Measurement II
   End_Group
   Group: Associated_Platforms
      Short_Name: SPOT-3
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Ultraviolet
      Spectral_Frequency_Coverage_Range: 350 nm to 1060 nm
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Near Infrared
      Spectral_Frequency_Coverage_Range: 350 nm to 1060 nm
   End_Group
   Online_Resource: http://www.nrl.navy.mil/rsd/7220/poam
   Online_Resource: https://eosweb.larc.nasa.gov/project/poam2/poam2_table
   Group: Instrument_Logistics
      Instrument_Owner: United States Navy
   End_Group
End_Group"""@en ;
  skos:prefLabel "POAM II"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed> ;
  a skos:Concept .