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Elevation Change Msmt (Stereo-photogrammetry (Generates DEM of '…

- - - - ∴ (2 x distance to reflector) = return time x speed
  - - - x Less good - laser requires no cloud cover
      - x Poorer coverage as less tracks travelled by satellites
    - - ✓ Much greater coverage (10 x better at least) - satellite tracks more numerous
      - ✓ cm-vertical precision
      - ✓ Routine repeat msmt