okansas.blogspot.com
Occassional thoughts about orienteering


Tuesday, December 13, 2011

Kansas Orienteering Champs 2011

 


Joe ran the course with a headcam.



Back to okansas.blogspot.com.

posted by Michael | 7:54 PM

1 comments




Monday, December 05, 2011

A quick base map

 

Here's a quick base map of the mountain bike/hiking trails at Perry. The area is small (the magnetic north lines are 150 meters apart). The contours (2.5 meters) are generated from OL Laser. The grey shading are Lidar slope from OL Laser (using all categories of data and last returns). The grey blobs cedar trees and groups of cedar trees in the forest. The trails are GPS tracks from a couple of trail runs.

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

2 comments




Sunday, December 04, 2011

Mapping runnability with lidar

 

I'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

2 comments


March 2002April 2002May 2002June 2002July 2002August 2002September 2002October 2002November 2002December 2002January 2003February 2003March 2003April 2003May 2003June 2003July 2003August 2003September 2003October 2003November 2003December 2003January 2004February 2004March 2004April 2004May 2004June 2004July 2004August 2004September 2004October 2004November 2004December 2004January 2005February 2005March 2005April 2005May 2005June 2005July 2005August 2005September 2005October 2005November 2005December 2005January 2006February 2006March 2006April 2006May 2006June 2006July 2006August 2006September 2006October 2006November 2006December 2006January 2007February 2007March 2007April 2007May 2007June 2007July 2007August 2007September 2007October 2007November 2007December 2007January 2008February 2008March 2008April 2008May 2008June 2008July 2008August 2008September 2008October 2008November 2008December 2008January 2009February 2009March 2009April 2009May 2009June 2009July 2009August 2009September 2009October 2009November 2009December 2009January 2010February 2010March 2010April 2010May 2010June 2010July 2010August 2010September 2010October 2010November 2010December 2010January 2011February 2011March 2011April 2011May 2011June 2011July 2011August 2011September 2011October 2011November 2011December 2011January 2012February 2012March 2012April 2012May 2012June 2012July 2012August 2012September 2012October 2012November 2012December 2012January 2013March 2013April 2013May 2013July 2013September 2013
archives
links