[OSM-talk] to all potlatch and JOSM users - automatic simplification of geometry

[Apollinaris Schoell]

On Aug 9, 2009, at 2:23 PM, Liz wrote:

> On Mon, 10 Aug 2009, Nop wrote:
>> Some people mentioned that the default settings of these tools are  
>> very
>> agressive - this is true and a more lenient approach might produce  
>> much
>> better results. But then, I have not seen any options to change  
>> this (in
>> JOSM).
>>
> It was in "advanced preferences". Can't find it right now

simplify-way.max-error

you need to play a bit with the numbers to find the right one for your  
use model


>
>> But on the other hand, there's some areas where you need those tools.
>> During my mapping I have found two areas where the way were hideously
>> over-defined. When ways have 10 or 20 times more nodes than  
>> required to
>> show their none-too-complex form or when nodes are set in 2m  
>> distances
>> it appears that someone has just uploaded raw GPS traces. This makes
>> those areas nearly unusable as even a very modest bounding box will
>> exeed the 50k nodes limit. In these cases, simplify way is your good
>> friend.
>>
> I concur
> I found about 350 -400 km of highway uploaded (twice) with points at  
> one per
> second at 100kmh travel speed
> Once uploaded and made into a way, and then the way deleted without  
> removing
> the points, then uploaded again
> and while we have editors that allow that sort of default behaviour,  
> then we
> need simplifying tools
>

+1
this discussion is pointless. all editors allow deleting ways. why  
should we bother about the power of simplifying a way.


>
>> Eventually, in an anarchic open source society like OSM you can't  
>> take
>> away a tool anyway, so don't even try. But it is definitely worth
>> refining and pointing out proper and improper uses.
>
>
>
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