[Qgis-developer] QGIS and 3D vectorial data

Marco Hugentobler marco.hugentobler at karto.baug.ethz.ch
Wed Dec 5 03:53:33 EST 2007

Hi Benjamin,

Yes, the geometry refactoring is planned post 1.0 as it will make fundamental 
changes to the qgis internals.

At the moment, the only 'support' for z-coordinate handling is that the 
z-coordinate is contained in the wkb format of the 25D types (e.g. 
WKBPoint25D, etc. coming from 2.5D shapefiles).


On Wednesday 05 December 2007 09:39:16 Benjamin Ducke wrote:
> Hi Martin,
> obviously, there are some major architectural changes in the
> pipeline that should sensibly be finished before proper
> Z-coordinate handling can be enforced throughout the QGIS API.
> I suppose the changes proposed in the RFC are for a post 1.0
> version?
> Best,
> Benjamin
> Martin Dobias wrote:
> > On Dec 4, 2007 3:21 PM, Benjamin Ducke <benjamin.ducke at ufg.uni-kiel.de> 
> >> My question is: in how far is the QGIS kernel prepared to deal
> >> with 3D vector data? Are the data structures in place and does
> >> QGIS maintain Z coordinates or do they get discarded?
> >
> > Hi Benjamin,
> >
> > currently there isn't support for Z coordinates - as our class
> > QgsPoint doesn't include support for Z coordinate. However we aim to
> > implement proposed changes by the following RFC:
> > http://wiki.qgis.org/qgiswiki/GeometryHandlingRfc
> > Then, QGIS kernel will be more or less prepared for 3D data handling
> > (once also providers get updated to load Z coordinate).
> >
> > Regards,
> > Martin

Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee
marco.hugentobler at karto.baug.ethz.ch

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