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PolyGeo
PolyGeo
7:34 AM
@CharlieBrumbaugh That sounds like a question that you should expand upon in a posting to the Main site.
 
 
6 hours later…
jbrengel
jbrengel
1:46 PM
Can anyone provide me with a group of scientists/scientist researching the impact of geology on LiDAR based stream mapping techniques. For example, half of our local county is underlain by karst geology. By the naked eye, it appears that lack of consideration of karst geology results in overestimation of streams based on LiDAR/Topological analysis.

See this picture for an example:

Yellow Line- Photogrammetric Based Streams (using 1 cm imagery) Blue Lines- Lidar Derived Streams (using 1 m2 DEM based on 60 acre contributing area threshold) Blue Polygons- Karst Geology
I'm operating under the assumption that the discrepancy between these two stream layers- particularly area circled in red- that is visible to the naked eye is largely caused by karst, but I'd welcome any other insights.
 

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