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## [TowerTalk] terrain profile algorithm

 To: towertalk [TowerTalk] terrain profile algorithm Jim Lux Sat, 16 Jun 2012 06:21:22 -0700 mailto:towertalk@contesting.com>
 ```I'm looking for an algorithm for my "generate all profiles for HFTA" app.. I've taken a couple trivial shots at this, but I'm pretty sure someone out there knows of a "better way". here's what I want.. I have an array of heights vs distance at fairly close post spacings (on the order of 10 meters) maybe 1000 points or so, representing the profile along a particular radial. What I want to do is "compress" that into about 100 or so segments that are connected (e.g. HFTA input). That is, I want to convert that to a series of x,y coordinates connected by straight lines that "adequately" represents the terrain. I started with a simple "if the adjacent point is within X meters in altitude, then collapse the two into one", but that produces profiles that somehow don't look right (and I can't say much about their HFTA fidelity). If the underlying terrain were a ziggurat or mesas with valleys, it would probably work, but it turns a gentle slope into a staircase. This is a classic problem in cartographic generalization, and, as it happens, this kind of profile is well represented by a fractal, but not that this helps me much. I was hoping that someone out there knew of a clever way to do it. Preferably in Python, since that's what I've written everything else in, but I can convert anything.. so if you have one written in COBOL, that's fine. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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