Point Cloud Draw Options

LIDAR Point cloud form  option ,  Draw tab

Draw tab 
Symbol sizes 1 (left) and 2 (right).

Use this only if zoomed in to a very small area, where the points are clearly separated.

IHS color merge: shows point cloud as overlay with the base map showing through.

Opacity: set level

Thin, map: faster if you skip points

LAS auto thin: the program can attempt smart thinning that will speed up drawing and not create holes.

Thin coeffiecient: with auto thinninng, the value will be PointDensity * ScreenPixelSize * ThinCoefficient

LAS legend

Min and Max Z: the program will attempt to scale the colors, but you can force the extremes to use.  You may need to look at a histogram (stats tab) to decide what are the real limits of the data; birds can give anomalous high points and there can also be low points.

  • Cloud Z takes the extremes in the point cloud.
  • DEM Z takes the extremes in the DEM used in the base map.

Coloring: both the intensity and RGB values are 16 bits in the LAS filel, and supposed to be scaled to use the full dynamic range (so that a division by 256 would lead to reasonable coloring.  This is frequently not the the case.  You can set the min and max colors, complete black and white respectively, and the program will linearly scale between them.  To find out the range of values in the LAS file, and hints at extreme tail values, use Histograms/Counts on the Stats tab. 

Main controls on the bottom of the form, always visible:

Last revision 4/10/2018