[Qgis-user] Quantum GIS and cadastre
pcreso at pcreso.com
Fri Dec 28 22:37:01 EST 2007
--- Beowulf <beowulfenator at gmail.com> wrote:
Note that QGIS has no internal support for a "native" datatype supporting arcs
or any other feature type. QGIS uses GDAL/OGR as a generic data accessor,
although I understand it has a custom PostGIS driver, instead of using the OGR
one. Therefore, to support curves, splines, etc, as geometry components, it is
first necessary to have these supported in data formats which are accessed by
QGIS. This is unlikely to happen for shapefiles or most other formats, but I
believe some progress is being made to support topological GIS features in
PostGIS, in which case assembling polygons (or line features) from constituent
linestrings & arcs may well become feasible in future.
However, you'll get more info about this from Postgis forums than QGIS. There
may also be something happening on the OGC front, as they wrote the Simple
Features Specification for storing geometries in relational databases
> I can tell you for sure that we don't use arcs in cadastre in this country.
> Only points, lines and polygons. In fact, I've seen several land plots which
> have circular fragments and they have been done as polygons.
> And if you have info about a specialized GIS, please tell me about it!
> Waiting for your soon reply!
> Ziegler Stefan wrote:
> > Hi there will be definitely better informed people about all the
> > possibilites of QGIS and more profound answers. But as as surveyor I
> > can give you the following answers: 1. - 4. Yes.
> > One big drawback for productive use in cadastral surveying is the lack
> > of support of circular arcs which is essential in Switzerland. I don't
> > know if it's necessary in Ukraine. The map composer is at the moment not
> > state of the art but will be improved next year.
> > I heard there's a project of the worldbank which has something to do
> > with open source cadastral surveying GIS. If you want I can ask for more
> > information.
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