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

<https://gcmd.earthdata.nasa.gov/kms/concept/7dcfb92b-2372-41df-8f5a-787f983065b5>
  ns0:altLabel [ ] ;
  skos:definition """Improved Limb Atmospheric Spectrometer-II (ILAS-II) developed by the
Environment Agency of Japan is a sensor to monitor the high-latitude
stratospheric ozone and will be aboard the ADEOS II platform(early
2001). The objectives of ILAS-II are to monitor and study changes in
the stratosphere which are triggered by emissions of
chlorofluorocarbons (CFC), and to evaluate the effectiveness of
world-wide emission controls of CFCs. ILAS-II is a spectrometer which
observes the atmospheric limb absorption spectrum from the upper
troposphere to the stratosphere using sunlight as a light source
(solar occultation technique).

The spectrometer covers the infrared region (2-13fÊm) and the near
visible region (753 to 784nm). ILAS-II was designed to improve
observation accuracy and cover wider spectral ranges than ILAS (aboard
ADEOS planned for 1996 launch by NASDA) which was based on LAS aboard
EXOS-C (Ohzora, ISAS, 1984).  ILAS's observations are focused in the
high latitude regions because of the geometrical relation of the solar
occultation events with the sun-synchronous orbit. From these spectral
observations, ILAS-II can measure the vertical profiles of species
related to ozone hole phenomena:ozone (O3), nitrogen dioxide(NO2),
aerosols, water vapor (H2O), CFC11, methane(CH4), nitrous oxide (N2O),
chlorine nitrate (CIO NO2),temperature, and pressure.

Characteristics:

      * Spectral Coverage
           CH:1 : 7.14 - 11.76mm(1400 - 850cm - 1)
           CH:2 : 2 - 8mm(5000 - 1250cm - 1)
           CH:3 : 12.80 - 12.83mm(781 - 779cm - 1)
           CH:4 : 753 - 784nm
      * Spatial Coverage(Height)
           10 - 60km
      * Vertical Resolution
           1km
      * Observation Accuracy
           5%(1% to ozone)
              (Processing Error is not included)
      * Observation Region
           N56 - 70deg / S63 - 88deg
      * Spectrometer
           CH:1 : Grating Spectrometer
           CH:2 : Prism Spectrometer
           CH:3 : Grating Spectrometer
           CH:4 : Concave Grating Spectrometer
      * Observation Parameters
           O3,HNO3,N2O,H2O,CFC-11,CFC-12 CIONO2, Aerosols,Pressure and
           Temperature.

Adopted from the Earth Observation Satellite Homepage:
"http://www.eoc.nasda.go.jp/guide/satellite/sendata/ilas2_e.html\""""@en ;
  skos:prefLabel "ILAS II"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c>
  skos:prefLabel "Spectrometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/7dcfb92b-2372-41df-8f5a-787f983065b5> .