topic Finding the first return points in raw LiDAR ASCII files. in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/finding-the-first-return-points-in-raw-lidar-ascii/m-p/465896#M6702 <HTML><HEAD></HEAD><BODY><SPAN>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.&nbsp; 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.&nbsp; How do I separate highest hit data out of these raw LiDAR ASCII files?</SPAN></BODY></HTML> Wed, 13 Oct 2010 18:04:56 GMT PaulHuffman 2010-10-13T18:04:56Z Finding the first return points in raw LiDAR ASCII files. https://community.esri.com/t5/arcgis-spatial-analyst-questions/finding-the-first-return-points-in-raw-lidar-ascii/m-p/465896#M6702 <HTML><HEAD></HEAD><BODY><SPAN>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.&nbsp; 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.&nbsp; How do I separate highest hit data out of these raw LiDAR ASCII files?</SPAN></BODY></HTML> Wed, 13 Oct 2010 18:04:56 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/finding-the-first-return-points-in-raw-lidar-ascii/m-p/465896#M6702 PaulHuffman 2010-10-13T18:04:56Z