Syntax highlighting of CRISM

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is a Visible and Near-Infrared (VNIR) imaging spectrometer onboard Mars Reconnaissance Orbiter (MRO), in orbit since 2006. It was built and tested by the Johns Hopkins University Applied Physics  Laboratory  under  the  supervision  of  principal  investigator  Scott  Murchie. The observations enable to have mineralogy information of the martian surface at a spatial resolution of ~20 to ~200 m/px.

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== Data description ==
he CRISM instrument has two acquisition modes:

 * '''The ''targeted'' mode '''(multiangular pointing): The  instrument  tracks the targets and takes 11 hyperspectral images (544 bands from 362 to 3920 nm)  at  different  emission  angles  due  to  the  rotation  of  the  detector  at ± 70°:  10  hyperspectral  images  taken  at  different  emission  angles  before  and  after  the  central  image  corresponding  to  the  close  nadir  image  (image  #07).  The  10  hyperspectral multi-angular  observations are reduced to a factor 10 compared to  the  spatial  resolution of  the  central  image. According  to  the  spatial  resolution  of  the central image, four  product types are associated to this acquisition mode. If  the  central  image  is  sampled  at  20  m/px,  the  associated  product  is  a  ''Full  Resolution Targeted'' observation (FRT). By reducing the spatial resolution of the  central  image  by  a  factor  2,  the  spatial  resolution  is  set  at  40  m/px  and  the  associated  products  are ''Half  Resolution  Short''  (HRS)  and ''Half  Resolution  Long'' (HRL) observations. An HRL sampled surface is twice as long as an HRS  observation.  Only  the  central  image  #07  is  processed  by  MarsSI  for  the  mineralogy identification.

{{attachment:FRT.PNG||width="200"}}

== Processing CRISM data ==