On 05.04.2009 02:14, Andrew Daviel wrote: > Re. the original question, I have a script which stores a track in a > binary tree database which I can later interrogate to find where I was at > a given time, i.e. the timestamp on a digital photo. > > One thing is it takes ages to save the track from maemo-mapper (I guess > convert from some internal format to GPX) so you want to do it often. I > mean, every day or so. My Garmin has limited RAM and so an > auto-filter feature for tracks. I'm not sure exactly what it does, but in > principle if you are going mostly in a straight line at constant speed > you need only save the acceleration/turn points. My photo script does > interpolation to guess the actual position. > I was trying to write a filter to post-process mapper tracks but it's > crude. Probably there are tools out there but I haven't looked; I tend to > write my own in Perl and make maps in XFig. gpsbabel does filters and conversion, e.g. for a decent gmapsible track, gpsbabel -i gpx -f bleh.gpx -x simplify,error=.05k -o kml,units=m -F bleh.kml ...now I'm reminded I have a "lag" filter patch sitting around somewhere that does the acceleration points along a straight line thing too, whereas the filters I've found in gpsbabel only deal with the shape of the track. Should dig that up... 't. _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
