Finding the first return points in raw LiDAR ASCII files.

Discussion created by huffmanp on Oct 13, 2010
I've been playing around with the ancient (2000) LiDAR data from the BOR for the Yakima Basin. There is a directory of ascii files called Bare_Earth_LiDAR named ysht*.txt where * is numbers from 01 to 912. These bare earth files have worked well in constructing some bare earth terrains.  Then there is this directory of ascii files called Raw_Lidar which contains all the hits from 1st returns to bare earth named ysht*.txt where * is 01 - 912.  How do I separate highest hit data out of these raw LiDAR ASCII files?