QGIS writing out incorrect .prj file

[qgib]

Author Name: Gavin Fleming (@gubuntu)
Original Redmine Issue: 7368
Affected QGIS version: master
Redmine category:projection_support

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QGIS 1.9 nightly build

Save a layer as a shapefile in EPSG 3857 and different prj and qpj files are written out. The prj file is inadequate. I picked this up when using the output shapefile as a gdalwarp cutline and the output raster cut was shifted by several kilometres. gdalwarp reads the prj file, not the qpj file. I renamed the qpj file to .prj and this solved the problem.

.prj:

PROJCS["WGS_84_Pseudo_Mercator",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mercator"],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1],PARAMETER["standard_parallel_1",0.0]]

.qpj:

PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],AUTHORITY["EPSG","3857"]]

[qgib]

Author Name: dr - (dr -)

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Confirm such behavior on latest master.

[qgib]

Author Name: Chris Matthews (Chris Matthews)

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I am also having trouble with the .prj file QGis is creating when working with 3857. I'm using Qgis 2.0.1

[qgib]

Author Name: Etienne Tourigny (@etiennesky)

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confirmed. look like the ogr provider needs updating... probably too late to include this in 2.2 though! At least there is a workaround.

[qgib]

Author Name: Etienne Tourigny (@etiennesky)

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Fixing this would require fixing QgsVectorFileWriter() and copying the .qpj file to .prj file.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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Etienne Tourigny wrote:

Fixing this would require fixing QgsVectorFileWriter() and copying the .qpj file to .prj file.

Producing the .qpj is a workaround because OGR converts the SRS to ESRI WKT for the .prj (ie. "OSRMorphToESRI()":http://www.gdal.org/ogr/classOGRSpatialReference.html#aac948450b15fa3d8814ab440b9f705b7) and that's not lossless. QGIS prefers the .qpj with the original information over the .prj. Keeping the original information is the whole point of the .qpj.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR
*
Source:*
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed