Re: [Gpsbabel-misc] Position filter has no effect
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From: Immersive T. <imm...@co...> - 2004-07-06 18:17:51
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No, by the description of the simplify filter it is not for eliminating duplicate points, but to shrink the number of points output. It seems odd that points from any type (waypoint, track point, etc) would be treated differently. Too bad. I was hoping this util would be useful. Bryan. ----- Original Message ----- From: "Alex Mottram" <al...@co...> To: "Immersive Technologies" <imm...@co...>; <gps...@li...> Sent: Tuesday, July 06, 2004 11:58 AM Subject: Re: [Gpsbabel-misc] Position filter has no effect > At 10:49 AM 7/6/2004 -0600, Immersive Technologies wrote: > >No success with this command either. > > > >Ok, I sort of anticipated this answer but didn't mention that I initially > >did try the command in this format too. You see, the README shows the > >command one way, but the command line help from the programs shows it the > >way I had it. Either way it's not doing any filtering... there are a > >zillion records written with essentially the same location and event a 1000 > >foot minimum distance doesn't eliminate them and it still writes 3675 lines. > > Ahh.... I haven't been keeping up on my formats lately. > > Apparently, GPL is a track format. It appears that the position filter > only processes > waypoint lists. > > Is there any chance that the "simplify" filter is what you're looking for and > not "position"? > > i.e.: > gpsbabel -i gpl -f evergreen.gpl -x simplify,count=1000 -o nmea -F foo.txt > > It seems like what you are trying to do falls exactly between the two filters. > The position filter takes a "shotgun" approach while the simplify filter is > "straight-line." > > From what I gather, you're looking for a straight-line with maximum > distance filter, > right? > > If that was going to get done, I'm not quite sure which filter would be the > best > to modify... > > Thanks! > > alex > > > > |