Photogrammetry


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Photogrammetry

  • Photogrammetry

    • - Elevation accuracy
      • Dependent on camera focal length stability (1 part in 10,000 = 5cm)
      • Potential variations during a flight (due to temperature, vibration, pressure, ???)
      • Calibration possible only over GCPs (virtually non-existent over ice)
    • + Excellent vertical resolution from low flight altitudes
    • + Excellent horizontal resolution
    • + Excellent geo-location
    • + Co-registered visible overlay
  • LIDAR













Synergy is achieved by using both DMS photogrammetry and ATM LIDAR

  • Synergy is achieved by using both DMS photogrammetry and ATM LIDAR

    • Improved DMS elevation accuracy
    • Improved IceBridge Elevation Model surface resolution
    • NSIDC Level-3 product (215,000 frames of Greenland 2011)
  • Airborne LIDAR / photogrammetric systems are now becoming operational

    • University of Alaska: Chris Larsen / Matt Nolan
    • EUFAR (European Facility for Airborne Research)
    • Riegl: Visible and Infrared Imagery
    • Trimble (Applanix)
    • Leica
    • Optec
  • Data set for Greenland 2011 has been delivered to NSIDC

    • Level-3 Elevation and Visible Overlay (215,000 frames each)
    • Processing pipeline is established
    • Nominal specifications
      • Elevation accuracy: Zero mean difference with ATM averaged over each DMS frame
      • Elevation vertical resolution: ~5cm
      • Elevation horizontal posting: 40cm
      • Geo-location accuracy: ~1 meter
      • Visual overlay resolution: 10cm


Small scale surface studies requiring knowledge of fine structure

  • Small scale surface studies requiring knowledge of fine structure

  • Improved slope determination, from glacier faces to snow buildup behind small ridges on sea ice

  • General visualization and understanding of any “Area of Interest”

  • Educational and public outreach

    • Pine Island Glacier “flythrough” was one of the most watched NASA videos of 2013





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