Changes between Version 23 and Version 24 of Sensors/LeicaLIDAR/MikesNotes


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Timestamp:
Sep 5, 2008 3:45:35 PM (10 years ago)
Author:
mggr
Comment:

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  • Sensors/LeicaLIDAR/MikesNotes

    v23 v24  
    1 == Mirror torsion error correction ==
    2 
    3 This shouldn't need to be done with newer LIDARs, but included here in case.  Leica suggests checking for torsion errors if there seem to be problems in the boresight calibration and reporting to them if found.
    4 
    5 Visible sign of torsion error is a smile effect.
    6 
    7 Detect torsion by:
    8  * choose highest altitude pair of crossing lines
    9  * pick a point at nadir on one swath and at the edge on the other
    10    * torsion will be at max for the edge swath and at 0 for the nadir swath
    11  * take cross sections to see if there is any consistent vertical difference
     1
    122
    133== Ground classification ==
     
    362352   * A road running up a hill is good for pitch (vertical change in surface easily found in the image).  These are good for measuring along-track shifts.
    363353   * Slopes with peaks (house rooftops are ideal) with the peak cutting across the line of flight ( --->  /\ ).  Again good for measuring along-track shifts.
     354
     355=== Mirror torsion error correction ===
     356
     357This shouldn't need to be done with newer LIDARs, but included here in case.  Leica suggests checking for torsion errors if there seem to be problems in the boresight calibration and reporting to them if found.
     358
     359Visible sign of torsion error is a smile effect.
     360
     361Detect torsion by:
     362 * choose highest altitude pair of crossing lines
     363 * pick a point at nadir on one swath and at the edge on the other
     364   * torsion will be at max for the edge swath and at 0 for the nadir swath
     365 * take cross sections to see if there is any consistent vertical difference
    364366
    365367== Automatic method (using Attune) ==
     
    409411   * Some outside the core intersection area
    410412   * Try to include some on slopes(?)
     413
     414
    411415--------------
    412416= Random snippets =