Hiya,
My first thought is that the documentation must change.
If I had perimeter fence features on some agricultural fields, I would
want the field feature to be a polygon but not the (closed) fence feature.
Surely the flexible way to go is exactly what is currently happening.
If a DXF user wants to create polygons from closed lines then surely
that should be a post-process. ie: select lines with layer=x,
linestyle=y etc etc, and convert these to polygons?
My 2c
Regards,
Zoltan
On 2015/01/26 16:18, Jukka Rahkonen wrote:
Spotted from gis.stackexchange:
http://gis.stackexchange.com/questions/131765/ogr-dxf-closed-polyline-conversion
The DXF driver documentation claims that closed polylines from DXF are
converted into polygons but that does not seem to happen. By comparing the
DXF snipped from stackexchange
ENTITIES
0
LWPOLYLINE
5
20000
8
0
100
AcDbEntity
100
AcDbPolyline
70
1
90
4
with a DXF specification
http://www.autodesk.com/techpubs/autocad/acad2000/dxf/lwpolyline_dxf_06.htm
I can read that LWPOLYLINE [code 70] is defined with flag 1 [closed]. But
could someone interpret what does it mean in GIS context? Should a closed
CAD polyline be translated into LINEARRING or POLYGON in WKT?
-Jukka Rahkonen-
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Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
P.O. Box 7, Muizenberg 7950, South Africa.
Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
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