[QGIS-trac] [Quantum GIS] #2509: ftools: mean coordinate(s) tool with "unique ID" field returns wrong results

[Quantum GIS]

#2509: ftools: mean coordinate(s) tool with "unique ID" field returns wrong
results
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   Reporter:  lutra                                      |              Owner:  cfarmer      
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.5.0
  Component:  Python plugins and bindings                |            Version:  HEAD         
   Keywords:                                             |   Platform_version:               
   Platform:  Debian                                     |           Must_fix:  Yes          
Status_info:  0                                          |  
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 To test I used the "regions" polygon layer from the spatialite sample
 dataset, saved as shapefile.

 Using as "unique ID field" the "name" field I would expect to tool to
 calculate the mean coordinate of each region (as the resulting table of
 attributes seems to indicate), but the mean coordinates are wrong, and
 this is easy to understand from the position of the resulting points. You
 can also save a single region as a single polygon and calculate its mean
 coordinate, you'll see different results.

 Tested under linux ubuntu 9.10 and qgis trunk.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/2509>
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