[OSM-talk] Removing home point cloud(s) from multiple GPX files

[Frederik Ramm]

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

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"