[QGIS-trac] [Quantum GIS] #1432: Delimited text import: precision loss (latlong)

Quantum GIS qgis at qgis.org
Thu Nov 27 12:29:49 EST 2008


#1432: Delimited text import: precision loss (latlong)
---------------------------------------------------------+------------------
   Reporter:  neteler                                    |              Owner:  nobody       
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.0.0
  Component:  Plugins                                    |            Version:  HEAD         
   Keywords:  Delimited                                  |   Platform_version:               
   Platform:  Mandriva                                   |           Must_fix:  No           
Status_info:  0                                          |  
---------------------------------------------------------+------------------
 I observe a severe precision loss when importing !LatLong CSV files:

 {{{
 #original CSV:
 ID,LONG,LAT
 BG1,10.367989875,45.873774277
 BG2,10.368377488,45.903017929
 BG3,10.368990013,45.907293667
 ...

 # imported into QGIS, saved as SHP

 shpdump traps_LL.shp
 Shapefile Type: Point   # of Shapes: 20

 File Bounds: (      10.341,      45.874,0,0)
          to  (      10.903,      45.927,0,0)
 ...
 Shape:18 (Point)  nVertices=1, nParts=0
   Bounds:(      10.369,      45.907, 0, 0)
       to (      10.369,      45.907, 0, 0)
      (      10.369,      45.907, 0, 0)
 ...
 }}}

 Precision of 3-digits isn't sufficient in !LatLong, especially if my
 original data were good.

 Suggestions: either increase the precision during import/export (not sure
 where it get's lost). Or add a "number of decimals" field to the user
 frontend so that s/he may decide.

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/1432>
Quantum GIS <http://qgis.org>
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