[QGIS-trac] [Quantum GIS] #3803: Problems with merge tool

[Quantum GIS]

#3803: Problems with merge tool
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   Reporter:  hebertazevedo                     |              Owner:  hebertazevedo
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.7.0
  Component:  Digitising                        |            Version:  1.6.0        
   Keywords:                                    |   Platform_version:  SP 3         
   Platform:  Windows                           |           Must_fix:  No           
Status_info:  0                                 |  
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 Dear,

 in the course of my work came across a problem in the Merge tool QGIS, as
 described below:

 In my industry work environment is Geomedia Professional, with the native
 format Access / Warehouse, QGIS is used as a tool in introductory courses
 on GIS and decentralization of the maintenance work of the base. Some time
 ago one of the students of these courses reported to us that there was an
 error when he tried to use the merge tool. The same is intended to create
 Brazilian regions from the polygon of UF's doing the merge between them.
 However the attempt to reconstruct the North Region had the error shown in
 Figure duvida_0 where some lines remain within the polygon. My first
 hypothesis was that there was problem in topology between polygons,
 returned to the production environment of the procedure and given a query
 to merge all of UF's, as can be seen in Figures 1 and 2 was performed
 smoothly. My second hypothesis is that there was error on export to shape,
 then did the same procedure on gvSIG, who presented an error similar to
 QGIS (Figure 3) and ARC GIS (Figure 4) that did not have the problem.
 Because only the free software the problem was identified that we believe
 may be the source the problem, including potentially exploited.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3803>
Quantum GIS <http://qgis.org>
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