[Qgis-user] Autotrace working?

[Neumann, Andreas]

Hi Martin, 

The solution you propose with segmentation would be a good solution for
QGIS 2.16. If possible, please include this in the bug fixing work. 

As you state, for later versions it would be nice to find a solution
that can preserve the curves. 

I am sending you data in a separate mail - not on the mailing list. 

Thank you, 

Andreas 

On 2016-06-22 13:37, Martin Dobias wrote:

> Hi Andreas
> 
> On Wed, Jun 22, 2016 at 12:42 PM, Neumann, Andreas <a.neumann at carto.net> wrote: 
> 
>> Hi all,
>> 
>> Thank you all for your ideas.
>> 
>> Meanwhile I found the problem: it doesn't seem to work with data containing
>> circular arcs (CurvePolygon, CompoundCurve, etc.). If I load data without
>> circular arcs it works fine.
> 
> Oh right - the circular arcs are not currently considered in tracing.
> 
>> Saber/Martin: could you estimate how much effort it would be to also support
>> these geometry types?
> 
> A simple solution should be fairly easy, and I can do that within the
> bugfixing work, but it would involve segmentation of circular arcs
> (for tracing we need to compute intersections of all geometries with
> GEOS). A more elaborate solution for the future could be to either use
> some heuristics to reconstruct the arcs or do not include arcs in
> intersection computation or handle arcs completely separately.
> 
> Would it be sufficient solution for you if the segmentation of arcs
> was in place?
> 
>> I could provide sample data with circular arcs (Geopackage, GML or Postgis
>> dump).
> 
> That would be useful - thanks!
> 
> Cheers
> Martin

  
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