[mapserver-dev] bug in WFS writer?

[Steve Lime]

Couple of questions:

  - how are you defining a "problem", based on TatukGIS's rendering or some other method? I'm not saying there isn't a problem but how do you know it's not a problem with the renderer?
  - do you have the source data (a shapefile?) available for testing?
  - what version of MapServer?

I recall another bug recently similar to this. It had to do with the MapServer point-in-polygon being indeterminate when a point in one part is on a polygon edge. The function is key to determining inner and outer rings. I thought I fixed it though, at least in SVN. Since a legal polygon can only share 1 vertex with an edge I updated the code to check at least 2 and one more to break the tie if one happened to be on an edge. That worked in any testing I had done.

Steve

>>> On 3/19/2008 at 1:16 PM, in message <47E15866.2010407 at osgis.nl>, "Bart van den
Eijnden (OSGIS)" <bartvde at osgis.nl> wrote:
> Hi list,
> 
> it seems Mapserver WFS has a problem with geometries having a (common) 
> point in them which touches the geometry itself. Mapserver WMS seems to 
> draw these polygons okay.
> 
> An example (look for instance at the second and third geometry):
> 
> WMS:
> http://www.osgis.nl/download/umn/wms.png 
> 
> WFS in TatukGIS (screendump):
> http://www.osgis.nl/download/umn/tatuk.png 
> 
> WFS xml file:
> http://www.osgis.nl/download/umn/wfs.xml 
> 
> Any ideas what could be causing this? Does this ring a bell to anyone?
> 
> Best regards,
> Bart