[gdal-dev] comparing two las files DEMs

[Riki Tiki]

hi, i know this is not directly related to the topics of this list... but anyways,
currently i have a.las file, then removed some of the points, and created b.las file.
Now, I create DEM of both a.las and b.las, taking into account that a.las file was the original one, how can i see if the DEM generated by b.las file is of acceptable quality as opposed to the DEM of a.las file.
thanks!!!