[OSM-talk] OSM data, how can we contribute to keep it to a reasonable size?

Martin Koppenhoefer dieterdreist at gmail.com
Thu Jan 18 09:01:55 UTC 2018


2018-01-18 6:14 GMT+01:00 Oleksiy Muzalyev <oleksiy.muzalyev at bluewin.ch>:

>
> - deleting unnecessary nodes from a way (Shift-Y in JOSM) with consequent
> verification of its geometry;




please do not use SHIFT+y (simplify way / DouglasPeucker) because it
doesn't know about the actual geometry, in particular sharp bends or curves
in general will get worse, it will reduce overall accuracy (within the
distance limit that you set/default, but ignoring angles). You will achieve
better results by adjusting the ways manually. IMHO applying this algorithm
to geometries other than those you added yourself is an automated edit and
should generally be discouraged. There are some sensible usecases (serious
"overnoding", particularly intermediate nodes in straight lines), but for
every longer way (more than a screenfull in reasonable zoomlevel) you will
typically not see all the effects, hence it's an automated edit.

Cheers,
Martin
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