header
 
Retour


WHAT IMAGERY, WHAT BAND SETTING?

  • Multispectral : the imagery needs to be multispectral.
    • Two bands is the minimum.
    • More bands is better.
  • Red to Green : the red to green (600 to 500 nm) part of the visible solar spectrum is where the majority of bands should be placed, with only a few bands outside this range.
  • A Panchromatic band may be included, provided it has been acquired concurrently with the spectral bands:
    • a Panchro band is a very wide band which may not be used like normal multispectral bands.
    • we have successfully used the SPOT PAN waveband, in addition to the normal SPOT XS bands, to extend the modeling depth range from 4-6 m down to 10-13 m in the clear waters of Bora Bora.
    • other case studies include Hyperspectral images like
      • CASI at Heron Island
      • HYPERION at Fakarava atoll,
      • HICO at Lee Stocking Island, Bahamas
      • Landsat 8, QuickBird and WV2
  • Near vertical viewing at high altitude on a "calm and clear" slightly hazy day is best.
  • Bathymetry modeling has been tested successfully using
    • SPOT XS, Landsat TM, ETM and OLI, IKONOS, QUICKBIRD
    • scanned color aerial photography,
    • airborne spectrographic imager data (CASI),
    • spaceborne spectrographic imager data (HYPERION, HICO).
  • FORMOSAT2, THEOS, PLEIADES should all prove to be suitable.
  • Digital multispectral video (DMSV) and digital aerial photography should prove to be suitable.
  • Spaceborne hyperspectral imagery should prove to be the ultimate source of data for bathymetry modeling in the years to come, subject to ground resolution though.

 




Créer un site
Créer un site