okansas.blogspot.com

okansas.blogspot.com
Occassional thoughts about orienteering

Friday, November 25, 2011

More tests with laser scan/lidar data for mapping

I've been experimenting with laser scan data and the latest version of OL-Laser. I've been learning more and more about how to use the data and what sort of information I can get.

Here's an image that combines the laser scan contours and cliffs generated by the OL-Laser software. You can tweak the contours and cliff settings, but the image is just to give you an idea of the basic information that is easy to pull out of the data with OL Laser.

The next image shows the results of some quick field checking. You can see some adjustments to the contours (and, in fact, the contours in the field checked image were derived from the same data but created with QuickGrid rather than OL Laser).

When you compare the two images, you can see that OL Laser did a good job of finding the cliff and cliff-like features. It doesn't distinguish between rock faces and earth banks (though you can pretty much assume that the steep edges along stream banks will be earth rather than rock in this sort of terrain). Given the settings I used, the software also highlighted areas that are steep and rocky but broken up enough that they aren't really cliffs. I tend to map those areas using either the boulder field or rocky ground symbol.

The snapshot shows the lone cliff that is a bit east of the pair of boulders.

The below snapshot shows some of the area that OL Laser picked out as a cliff but that I've mapped with the boulder field symbol

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posted by Michael | 3:53 PM

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