Hi Casper,
DigitizingTools compares _only_ the SRS-id (SRS =
SpatialReferenceSystem) of the project and the layer. If they missmatch
the warning is thrown so the user gets a hint why certain functions are
greyed out.
Thus relevant is not the prj file but the SRS assigned to the layer and
the project in their properties. To solve this issue: if they share a
common projection, go in the layer properties and choose the same SRS as
the project's from the list of projections.
Background (AFAIK): In Shapefiles the data do not carry information on
their SRS (like e.g. in PostGIS or gml). This information is contained
in the (optional) prj file. QGIS reads the prj file and assigns the
first matching SRS to the data (matching = definition is identical). If
there is none matching, a USER-SRS is created with the projection
information given in the prj file.
Bernhard
Am 08.04.2016 um 10:10 schrieb Casper Børgesen (CABO):
Hi!
I have a user who constantly get a yellow warning from QGIS when he enables
editing on set of specific shape files. The message is:
DigitizingTools: Amend Line is disabled because layer CRS and project CRS do
not match!
The project CRS is EPSG:25832. The shape file has the following .prj file:
PROJCS["ETRS_1989_UTM_Zone_32N",GEOGCS["GCS_ETRS_1989",DATUM["D_ETRS_1989",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",9.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]
In "layer properties/General/Coordinate reference system", QGIS displays "Selected
CRS (EPSG: 3044, ETRS89 / ETRS-TM32".
If he enables editing on a shape file with the following .prj file, it doesn't
happen:
PROJCS["ETRS89_UTM_zone_32N",GEOGCS["GCS_ETRS_1989",DATUM["D_ETRS_1989",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",9],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
The strange thing is that this only happens on his computer not on a couple of
other machines we have tried on.
If there indeed is a CRS mismatch it make sense, but he is the only of our
users experiencing this.
Regards, Casper
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