Changes between Version 10 and Version 11 of Sensors/LeicaLIDAR/MashUp


Ignore:
Timestamp:
Oct 22, 2008 12:29:36 PM (11 years ago)
Author:
mark1
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • Sensors/LeicaLIDAR/MashUp

    v10 v11  
    226226   * profiles along a track (e.g. following a ditch / feature in the surface)
    227227   * narrow profiles across features where swaths overlap
     228   * try to select profiles over flat hard features (roads, runways, etc) to lessen perspective effects
    228229 * comparisons against GCPs
    229230   * requires the point cloud to be converted to a surface - also useful if no local DEM available for hyperspectral instrument processing.
     
    410411   * 'a' centres the image
    411412   * '+/-' to zoom in/zoom out
    412  * Now select tie points. We use streets for tie points since these should be on the ground so no (little) effects due to look angles and also has slow varying topography
     413 * Now select tie points. We use streets for tie points since these should be on the ground so no (little) effects due to look angles and also has slow varying topography see ''HINTS'' below
    413414 * Open tie point editor in Attune.
    414415   * Press 'm'  to measure a point and then click where you want it. Do this for each image (selecting the same point). Then press 'sample all' to record the locations.
     
    418419 * Edit project file properties.
    419420   * Torsion constant =-100,000
     421
     422
    420423   * Image observation Weights 0.2, 0.2, 0.1
    421424   * Atmosphere same parameters as in the ALSPP processing
     
    444447
    445448After completing the Attune process, save the parameters as a reg file (for reference - you will need to manually transfer the numbers to avoid overwriting other parameters).  Then check the boresight parameters using the manual procedure above and adjust if required.
     449
     450=== ''HINTS'' ===
     451It may be useful (proved so in calibration site of little rissington) to copy the PNGs generated by Attune and draw onto them. Use a noticeable colour (e.g. red) and draw straight lines along features which will not change (negligably) between images. For example, draw along field boundaries into, and over, the roads or along runways from the centre of the white cross to the centre of the cross at the other end of the runway. Also draw along road edges at junctions to create crosses where you can select the centre as a tie point. Doing this on each image will allow much better precision of selecting tie points.
    446452
    447453=== Selecting tie points ===