[Qgis-developer] QgsCoordinateReferenceSystem instantiation

[Tim Sutton]

Hi Francois

> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 498: (getRecord) failed : /resources/srs.db does not exist!

Seems that your application resources search path is not set (you
should see the full path before /resources/srs.db). Try setting the
application prefix path before trying to instantiate your CRS object
e.g.

QgsApplication::setPrefixPath( INSTALL_PREFIX, true );

Regards

Tim

On Mon, Oct 11, 2010 at 8:49 PM, Francois Maass <fieliesm at gmail.com> wrote:
> Good day all!
>
> When I try to create a QgsCoordinateReferenceSystem object from an image’s
> metadata (via GDAL->GetProjectionRef()), I get the following output:
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 245:
> (createFromWkt) QgsCoordinateReferenceSystem::createFromWkt(QString theWkt)
> using: PROJCS["UTM Zone 36, Southern Hemisphere",GEOGCS["Unknown datum based
> upon the Clarke 1880 ellipsoid",DATUM["Not specified (based on Clarke 1880
> spheroid)",SPHEROID["Clarke
> 1880",6378249.144808011,293.4663076556303,AUTHORITY["EPSG","7034"]]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",33],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",10000000],UNIT["Meter",1]]
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 491:
> (getRecord) running query: select * from tbl_srs where parameters='+proj=utm
> +zone=36 +south +a=6378249.144808011 +b=6356514.966204134 +units=m +no_defs'
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 498:
> (getRecord) failed : /resources/srs.db does not exist!
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 413:
> (createFromProj4) globbing search for srsid from this proj string
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 753:
> (setMapUnits) Projection has linear units of Meter
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 791:
> (findMatchingProj) entered.
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 795:
> (findMatchingProj) QgsCoordinateReferenceSystem::findMatchingProj will only
> work if prj acr ellipsoid acr and proj4string are set and the current
> projection is valid!
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 416:
> (createFromProj4) globbing search for srsid returned srsid: 0
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 431:
> (createFromProj4) Projection is not found in databases.
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 753:
> (setMapUnits) Projection has linear units of Meter
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 491:
> (getRecord) running query: select * from tbl_srs where parameters='+proj=utm
> +zone=36 +south +a=6378249.144808011 +b=6356514.966204134 +units=m +no_defs'
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 498:
> (getRecord) failed : /resources/srs.db does not exist!
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 442:
> (createFromProj4) Projection appears to be valid. Save to database!
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 1266:
> (saveAsUserCRS) Update or insert sql
>
> insert into tbl_srs
> (description,projection_acronym,ellipsoid_acronym,parameters,is_geo) values
> (' * Generated CRS (+proj=utm +zone=36 +south +a=6378249.144808011
> +b=6356514.966204134 +units=m +no_defs)','utm','','+proj=utm +zone=36 +south
> +a=6378249.144808011 +b=6356514.966204134 +units=m +no_defs',0)
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 491:
> (getRecord) running query: select * from tbl_srs where parameters='+proj=utm
> +zone=36 +south +a=6378249.144808011 +b=6356514.966204134 +units=m +no_defs'
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 498:
> (getRecord) failed : /resources/srs.db does not exist!
>
> /home/fielies/dev/cpp/qgis/src/core/qgscoordinatereferencesystem.cpp: 469:
> (createFromProj4) Couldn't find newly added proj string?
>
>
>
> And then after this, the call to  ‘crs->createFromWkt(projDefinition)’
> returns false.
> Could someone please tell me why this method returns false?
>
> Thank you!
>
> Francois
>
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>



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