[OSM-talk] Straw Poll - Disk space used by OSM photos/audio

[Karl Newman]

On Thu, Feb 14, 2008 at 2:04 AM, Robert Vollmert <rvollmert-lists at gmx.net>
wrote:

> Hello,
>
> On Feb 13, 2008 9:41 AM, Gregory <nomoregrapes at googlemail.com> wrote:
> > Maybe (I possibly thought this when I started) so nobody knows
> > where I live/start, but I could easily not worry about that.
>
>
> On Feb 13, 2008, at 19:14, Karl Newman wrote:
> > Yeah, I've been collecting traces, too, but not yet uploading them
> > because I don't really want the cluster of points around my house.
> > I found a graphical editor that can edit traces (GPSTrackMaker) but
> > I haven't had time to edit them for uploading yet.
>
> I believe gpsbabel supports this kind of operation:
>
> gpsbabel -i gpx -f raw.gpx -x
> radius,exclude,distance=1.5M,lat=30.0,lon=-90.0 -o gpx -F filtered.gpx
>
> should remove all points within 1 1/2 miles of the specified lat/lon
> pair from raw.gpx, saving the output in filtered.gpx. (I haven't
> tested this.)
>
> See also http://www.gpsbabel.org/htmldoc-development/
> filter_radius.html .
>

I tried exactly that filter first, a while ago. For some strange reason,
that filter only works on waypoints, not trackpoints. I think I read
somewhere that the author said it "didn't make sense" to filter trackpoints
like that--didn't know what to do with the points after the gap (hint: new
track segment).


> Would it make sense to add these kind of filters to the GPX upload
> facility to encourage more people to upload their traces?


It would probably encourage more people like me to upload. However, since I
carry my GPS around with me almost everywhere (at least when I'm going
places where I don't yet have tracks), I'd probably need to filter out a
bunch of useless stuff anyway, such as the cluster of points when I stop at
a store or something.

I'd also
> like some automatic time shift (to say the first of the month, at
> 0:00)...


What's the purpose of that change? To disguise the actual timestamps?

Karl
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