[QGIS-trac] [Quantum GIS] #3244: AddGeometry- faulty units and precision

Quantum GIS qgis at qgis.org
Tue Nov 23 06:25:22 EST 2010


#3244: AddGeometry- faulty units and precision
------------------------------------------------+---------------------------
   Reporter:  muscatelle                        |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.7.0
  Component:  Build/Install                     |            Version:  1.5.0        
   Keywords:  ADD Geometry units precision      |   Platform_version:  Ubuntu 10.04 
   Platform:  Debian                            |           Must_fix:  No           
Status_info:  0                                 |  
------------------------------------------------+---------------------------
 Using Tools>GeometryTools>Export/AddGeometryColumns, has some problems
 with units and precision.

 Output seems to be in units of 100km eg

 An area 69.38Ha (measured using the measurement tool) is output as 6.9e-05
 Perimeter ~ 3.3Km (measured using the measurement tool) is output as
 .032753

 This has the potential to cause errors and produce misleading information
 on subsequent calculations

 Project units are m.

 Sample files before and after Add Geometry are attached

 Workaround is at: http://forum.qgis.org/viewtopic.php?f=2&t=7531#p15730

-- 
Ticket URL: <https://trac.osgeo.org/qgis/ticket/3244>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats


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