On 1/12/20 9:36 pm, Colin Smale wrote:
On 2020-12-01 11:14, Warin wrote:
The differences are less than 10m. (The points of the green track are
where data exists, the straight lines between those points simply
connect the measured points. )
The 'simplify way' in JOSM is normal set for a maximum difference of
3m as a way of reducing data bloat while sacrificing some accuracy.
What accuracy is optimal for OSM? Why should we sacrifice any accuracy
at all? Who chose 3m as a tolerance figure? That sounds rather high to
me - it's the width of a small road, or half a house. If we are going
to draw a line at all, I would go for something <= 1m.
In some instances the 3m distorted the feature I was dealing with. When
I set it to 1.5m the result was a good represeentation of the feature.
So I deal with the resulting representation of the feature.
--------------------
I note that some roads in OSM are straight lines between towns .. while
in the real world they are far from straight. This has to deal with the
road exists but mappers have limited time to enter data. Only in places
where local mappers have mapped most things that the details are mapped
better are 'accuracies' of some discussion.
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