Changes between Version 8 and Version 9 of Sensors/LeicaLIDAR/FWMarksNotes


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Timestamp:
Jan 26, 2010 11:55:36 AM (10 years ago)
Author:
mark1
Comment:

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  • Sensors/LeicaLIDAR/FWMarksNotes

    v8 v9  
    3737  * Displays waveform and discrete points
    3838  * There is a "constant" timing offset between the waveform and discrete points - thought to be due to processing time. This should be removed at calibration
     39  * In waveviewer "Ret point loc" is the discrete return time (from emit to receive) for the first return
     40  * intensity is the value for each discrete return
    3941
    4042 * New version of Terrascan capable of displaying full waveform data and "creating extra" points from the waveform
     
    6062  * Use points throughout flight line not just at start to derive the offset.
    6163  * Procedure
    62    * In waveviewer "Ret point loc" is the discrete return time (from emit to receive) for the first return
    63    * intensity is the value for each discrete return
     64   * Check LAS file is suitable by loading into LASHistoViewer and checking AGC is fairly constant (should be a tight/narrow histogram in the centre)
     65   * Select view by time and volt in waveviewer and zoom into the graph
     66   * Find a discrete point with ~ 1V intensity value
    6467   * Measure the distance between discrete and full wave peak by zooming into the image and counting the time difference along the x-axis.
     68   * Can enter the offset value into waveviewer to check discrete and peak align (enter the value in picoseconds)
     69   * Repeat this for a few samples throughout the file and take an average.
     70 * Terrascan new options - waveform viewer and point extraction
     71  * Need to import trajectory
     72  * then flightline -> deduce from time
     73  * Should be able to view waveforms now
     74  * Waveform display settings
     75   * sample height - changes y scale
     76   * maximum value - changes x scale
     77  * 3D drawing
     78   * draws a coloured vector onto the design file depending on the waveform intensity. To remove it, you need to select the line and delete it.
     79   * ambient noise - change the threshold level of noise for colour coding the waveform vector