E3de or ENVI (depending on what version etc), has the function to capture building polygons and generate a Digital Elevation Model (DEM) and a Digital Surface Model (DSM) from a classified LAS file. Granted it can do more, however at the moment, just chasing these three. I've been playing around with it and it seems as though it's more efficient in calculating a singular tile at a time, rather than numerous tile (perhaps also a limitation from the PC). However, I have nearly 10,000 tiles, pushing 1TB of data, and desperately searching for a batch code to run these tiles, one by one, written through IDL which ENVI/E3de seems to talk to. I've trawled through a number of sites and found nothing, hoping somebody can help. I need ENVI to: - Load the Las file (and stipulate the projection) - Process the data to provide a DSM, DEM and Building Polygons (again based on a pulldown selection of parameters - these don't change) which (as part of the program) dump into their own directory - Move on to the next one. Any suggestions would be great, or any leads on where to look. Could be handy for anybody really who wants to generate building polygons from Lidar. Cheers