A point
filter
is a set of classification, return combination, and elevation range
values that define a set of points. By modifying the point filter,
you can limit a set of points that can be used to create a surface
for use in the conflation process.
Learn
more about the point filter
How to Modify the Point Filter
Modify Point Filter Command 
- Within the Elevation
Conflation dialog, click the "Modify Point Filter"
command.
- The Point Filter Property
Page will display. Select the desired classifications, returns,
and elevation ranges to define the set of points to use for conflating elevations and select OK.