Hi all,

I'm toying around with the GroundFilter tool in the USDA Forest Service software Fusion. The GroundFilter tool specifies that the default parameter values for the gparam and wparam switches are adequate for las files with point density greater than 4. But my files are low density las files, so I'm trying to optimize the gparam and wparam values in order to get an output with only ground points. I've verified (using lasview) that the default gparam and wparam values are inadequate for my low density las files...there are a lot of outliers remaining above the ground points.

Are there any rules of thumb or best practice techniques for altering these parameters in order to get the best possible result?