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List: qgis-trac
Subject: [QGIS-trac] [Quantum GIS] #2043: Merging multi-polygon-features on
From: "Quantum GIS" <qgis () qgis ! org>
Date: 2009-10-30 13:36:12
Message-ID: 035.e18e1aff4b1984eab0c5582c5ce90ee2 () qgis ! org
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#2043: Merging multi-polygon-features on PostGIS fails
---------------------------------------------------------------+------------
Reporter: fritz123 | Owner: nobody
Type: bug | Status: new
Priority: major: does not work as expected | Milestone:
Component: Digitising | Version: HEAD
Keywords: postgis, merge, multipolgon, st_union, st_multi | Platform_version:
Platform: Debian | Must_fix: No
Status_info: 0 |
---------------------------------------------------------------+------------
QGIS 1.3.0 can't merge features as described below:
"The union operation would result in a geometry type that is not
compatible with the current layer and therefore is canceled"
Imagine a PostGIS-geometry-table, using the type multipolygon. Some of the
features therein have islands, others don't. If you try to merge two
features without islands, the resulting feature is type polygon. This also
happens, when you try it manually using st_union. Since there is a
constraint on the geometry column, the resulting feature can't be
inserted. Using st_multi helps on database level.
PostGIS-Version is 1.3.6.
--
Ticket URL: <https://trac.osgeo.org/qgis/ticket/2043>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats
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