On Fri, Apr 17, 2009 at 1:48 PM, Frederik Ramm <[email protected]> wrote:
> Hi, > > Karl Newman wrote: > >> I want the same thing, and I looked into doing this with GPSBabel, too, >> and >> while it has the capability to filter points inside or outside a radius >> (or >> polygon, etc.), that function does not work on trackpoints, and the author >> had said something to the effect of "it doesn't make sense to have it >> enabled for trackpoints because it would make false tracks (jumps, etc.)". >> > > Those free software authors are bastards aren't they ;-) > > Someone on talk-de recently posted the following magic spell he's using > with gpsbabel to simplify his tracks, clear them of point clouds and exclude > certain areas: > > -x nuketypes,waypoints,routes > -x transform,wpt=trk > -x nuketypes,tracks > -x polygon,file=europa.txt > -x polygon,file=gruener.txt,exclude > -x sort,time > -x transform,trk=wpt > -x nuketypes,waypoints > -x track,pack,sdistance=0.2k,split=20s > -x position,distance=1m > > The clever bit seems to be the -x transform incantantions with which he > converts trackpoints to waypoints before applying the polygon filter, then > transforms them back! > > Bye > Frederik > Cool. I'll have to check that out. I'm curious to see what information is lost in the translation. Karl
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