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

Timestamp:

Oct 22, 2008, 12:29:36 PM (16 years ago)

Author:

mark1

Comment:

--

Sensors/LeicaLIDAR/MashUp

@@ -226 +226 @@
    * profiles along a track (e.g. following a ditch / feature in the surface)
    * narrow profiles across features where swaths overlap
+   * try to select profiles over flat hard features (roads, runways, etc) to lessen perspective effects
  * comparisons against GCPs
    * requires the point cloud to be converted to a surface - also useful if no local DEM available for hyperspectral instrument processing.
@@ -410 +411 @@
    * 'a' centres the image
    * '+/-' to zoom in/zoom out
- * 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
+ * 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
  * Open tie point editor in Attune.
    * 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. 
@@ -418 +419 @@
  * Edit project file properties. 
    * Torsion constant =-100,000
+
+
    * Image observation Weights 0.2, 0.2, 0.1
    * Atmosphere same parameters as in the ALSPP processing
@@ -444 +447 @@
 
 After 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.
+
+=== ''HINTS'' ===
+It 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.
 
 === Selecting tie points ===