[HOT] experience and methodology
wendorff at uni-paderborn.de
Wed Dec 21 10:06:13 GMT 2011
In OSM in generally it's not a good advise to take GPS logs from the
device directly to push it into the map database.
But: Use your human mind to fix the measurement errors: a straight road
is a straight road, even if the trace says it's a zig-zag-line crossing
the straight connection repeatingly.
You ALWAYS have to do this manual postprocessing of traces, and that's
not due to your specific logging device.
Good strategies are:
- trace more than one log of the same route and manually use some kind
of average over all.
- trace intersections not by stopping in the middle and marking a
waypoint, but by crossing the intersection in both directions to get
crossing lines in the trace later.
- for fix points (like post-boxes, drinking water supply...) place the
device on top of it and measore for a while (some minutes). You'll again
get a blurred blob in the gpx trace with the jumping signal: use the
middle (and justify the whole stuff with roads etc).
P.S.: Always keep in mind: relatively accurancy of the whole map - and
between the map features - is better than absolute accurancy of a few
elements, but post boxes mapped on the wrong side of the street.
Am 21.12.2011 09:59, schrieb Frans Thamura:
> We use gps essential, and we got that waypoint is.not ideal to map, we
> need extra effort.
> That is. We need your wxperience work with bad way point to become
> high quality map
> On Dec 21, 2011 3:19 PM, "Kate Chapman" <kate at maploser.com
> <mailto:kate at maploser.com>> wrote:
> Hi Frans,
> What do you mean by experience before and after? The differences in
> the data? What people learned?
> What is available at: http://tasks.hotosm.org/job/9 is the
> instructions we gave people.
> There wasn't any data available beforehand except a couple roads.
> On Wed, Dec 21, 2011 at 2:49 PM, Frans Thamura <frans at meruvian.org
> <mailto:frans at meruvian.org>> wrote:
> > hi all
> > read about mapping in padang etc,
> > can anyone share your experience, from before to after.
> > so we can see the different of the valuable work.
> > --
> > Frans Thamura (???)
> > Shadow Master and Lead Investor
> > Meruvian.
> > Integrated Hypermedia Java Solution Provider.
> > Mobile: +628557888699 <tel:%2B628557888699>
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> > "We grow because we share the same belief."
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