Occassional thoughts about orienteering

Saturday, October 10, 2009

Some Lidar data from one of my current mapping projects


I discovered another program for using Lidar data. Microdem has a feature that I've made use of. I can take a "DEM" file and create an image that lets me see quite a lot of the detail.

Below is an area that I've started mapping. What is especially useful is that I can pick out the bottom of small ditches and streams. The bottom of the image - what looks like a fuzzy television picture - is some sort of error. I haven't figured out what is going on. The DEM data covers that part of the terrain, but for some reason I can't get Microdem to show it.

Below are contours (2 meter) generated from the Lidar bare earth data. I added the trails by running the area with a GPS and then using the track to draw the trails. It isn't perfect, but it is a good start.

I also use the Lidar "intensity" data to pick out some detail. For the most part I use the intensity data to pick up vegetation - individual trees and vegetation boundaries. Sometimes I'm able to pick out subtle vegetation information. I think there is the potential to get a lot more information out of the intensity image than I've managed to get.

Back to okansas.blogspot.com.

posted by Michael | 6:59 PM


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