Occassional thoughts about orienteering
Tuesday, December 13, 2011
Kansas Orienteering Champs 2011
Back to okansas.blogspot.com. posted by Michael | 7:54 PM
Monday, December 05, 2011
A quick base map
Even without any field work, I think this will be a good map for some training. With a bit of field work it'll make a good addition to our local maps.
Back to okansas.blogspot.com. posted by Michael | 8:29 PM
Sunday, December 04, 2011
Mapping runnability with lidarI've been experimenting with trying to map vegetation - the runnability of the forest - from laser scan/lidar data.
The map below shows one of my tests. I created the map using OL Laser. I used the software to measure object heights. I created different colors to correspond to object heights. The yellow is ground height. In this particular map, the yellow areas are mostly open fields or open water. Then I created three other categories of object height. The lowest objects are shaded dark green. Medium height objects are light green. The heighest objects are white. I figured this shading scheme would roughly match runnability.
The map below shows highlights three different sections of forest.
Section A is an area that has a lot of low objects, with some yellow areas mixed in. This area turns out to be dense cedar trees. It would be mapped dark green on the final orienteering map.
Section B is an area with mainly tall objects. In this case, the tall objects are mature trees. The area has little undergrowth and would be mapped as white forest.
Section C is an area that is mixed. It doesn't have as many short (dark green) objects as A and it doesn't have as many tall (white) objects as B. This area would probably be a shade of green on the final orienteering map.
The tricky thing about mapping the runnability of the forest around here is that the changes are generally subtle. The shift from white woods to light green woods isn't very distinct and deciding where the mark the change is difficult for the mapper. The laser scan data might be a way to help see some of those distinctions.
I plan to do some more experimentation.
Back to okansas.blogspot.com. posted by Michael | 9:01 AM