QGIS crashes when measuring distances with another ellipsoid than the default one

[wolfgang.qual@…]

When changing the default ellipsoid for the measuring-tool (with the default one, the results of the measurement are wrong) to another one (e.g. bessel), QGIS crashes with the first click of the measurement. I am using 0.8.0 prev. 2, on Debian sarge.

[wonder]

I can't reproduce it. Someone else can?

Also please could you add some more information:

• any selected ellipsoid will fail except WGS84?
• what tool fails - measuring of distances or areas or both?
• what's the spatial reference system of the project?

[anonymous]

Can not reproduce on Ubuntu Edgy (QGIS from SVN).

Reporter: could You, please, fetch fresh version from SVN and then test with it?

[g_j_m]

I can reproduce it. The crash is caused by a throw in qgscoordinatetransform.cpp ​https://svn.qgis.org/trac/browser/trunk/qgis/src/gui/qgscoordinatetransform.cpp#L479), which isn't caught. Using the latest version from svn.

This is from loading a shapefile with an srs of +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs from postgres, choosing the measure line tool, and qgis exits with the first click of the mouse on the canvas. The ellipsoid for the length calculation is walbeck. Output on the console is:

Warning: QgsSpatialRefSys::getRecord failed :  select * from tbl_srs where parameters='+proj=longlat +ellps=walbeck +no_defs'
Warning: QgsSpatialRefSys::findMatchingProj -------> no match found in user db
Warning: QgsSpatialRefSys::getRecord failed :  select * from tbl_srs where parameters='+proj=longlat +ellps=walbeck +no_defs'
Warning: QgsSpatialRefSys::findMatchingProj -------> no match found in user db
Warning: QPainter::begin: Painter already active
Warning: QgsSpatialRefSys::getRecord failed :  select * from tbl_srs where parameters='+proj=longlat +ellps=walbeck +no_defs'
Warning: QgsSpatialRefSys::findMatchingProj -------> no match found in user db
Warning: Throwing exception qgscoordinatetransform.cpp
Warning: Throwing exception qgscoordinatetransform.cppÌ
terminate called after throwing an instance of 'QgsCsException'
  what():  Failed forward transform of
(47310.6, 104558)
with error: geocentric transformation missing z or ellps

Abort

relevant bit from the stacktrace is:

#9  0xb6423ab2 in __cxa_throw () from /usr/lib/libstdc++.so.6
#10 0xb7daefa0 in QgsCoordinateTransform::transform (this=0x8174330, thePoint=
      {m_x = 2716238.255536627, m_y = 6044930.7005962525},
    direction=QgsCoordinateTransform::FORWARD)
    at qgscoordinatetransform.cpp:205
#11 0xb7ca6ec3 in QgsDistanceArea::measureLine (this=0x820f810,
    p1=@0xbfffe430, p2=@0xbfffe420) at qgsdistancearea.cpp:297
#12 0xb7e0e89a in QgsMeasure::mouseMove (this=0x81b0390, point=@0xbfffe4d0)
    at qgsmeasure.cpp:184

[g_j_m]

Fixed in svn r6083. But the lengths and areas given look wrong :(

[g_j_m]

My fault - the base srs was wrong for the data.

[(none)]

Milestone Version 0.8 deleted