Just in case you don't have the links required to work with Pennsylvania LIDAR:
The best place to get LIDAR data for Pennsylvania and most states that have it available is:
The imagery to go with it is located at:
http://maps.pasda.psu.edu/website/Image ... ools=PAMAP
The software to view LIDAR is at:
http://forsys.cfr.washington.edu/fusion ... atest.html
and the tutorial is located at:
Obviously, it's accuracy is best on flatter land and on trees not directly over water. Accuracy over slopes is minimized along the flight lines and becomes worse as the scan angle gets away from true vertical where the laser is scanning off to the side of the plane. Where the two errors combine, hillsides can be seen with unusually large numbers of trees that may appear excessively tall while similar sloped nearby hillsides of similar forests will show few if any tall trees. Knowing it's limitations can help one to interpret the data and make judgments to prioritize ground truthing hikes.
Joe wrote:so, how accurate is it?
Thanks very much for doing this. I look forward to going through the process. I see it as growing importance to our shared measurement mission. As of this moment, I'm neck deep in formulas and processes from Michael Taylor on this Triangle Method and its adaptation to the equipment configuration that I have, which is not small order. When I'm able to come up for air, I'll dive into LIDAR and also produce the tuliptree map I promised. There is a lot that is exciting going on. Ed's reorganization of the BBS interface has come at a good time.
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