Using a Height Filter during the execution of the planar
filter uses the minimum and maximum object height parameters
to eliminate points above a ground surface from consideration. Using
a height filter is particularly useful for eliminating planes
that are not objects of interest because they are too low or too high
from the ground surface. For example when using a planar filter to
locate building points, points below a minimum object height can eliminate
cars, trucks, or even smaller objects such as dog houses that are
not desired.
Using a height filter in general will classify less points, but will
increase the overall accuracy of the filter. It is highly suggested
to produce expected results that a height filter be used in conjunction
with the planar filter. When using a height filter you must also define
a ground point filter which defines the point classes to use as a
ground surface.
Learn
more about the ground point filter
On the Planar Point Filter property page, click the Use Height Filter checkbox.
Click the Ground Points .. button to define the points to use as ground surface.
Enter values in the boxes for 'Minimum Height' and 'Maximum Height'
Click the 'Apply' button to commit the changes.