Hi Benoit,
I created a new shapefile by QGIS with same CRS of Town (EPSG 32630).
The QGIS created two files of projections: PRJ and QPJ.
The PRJ have the same value of yours (Town.prj) but the QPJ don´t
have
same value (see below):
1) Default -PRJ :
PROJCS["WGS_1984_UTM_Zone_30N",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-3],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
2) Create by QGIS - QPJ :
PROJCS["UTM Zone 30, Northern Hemisphere",GEOGCS["WGS
84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-3],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
The QGIS read CRS only by QPJ value.
You can put this value(QPJ) inside in PRJ file for work with QGIS.
The questions is:
Why, QGIS have two different values for "WKT CSR" for same EPSG
32630 ?
One for PRJ other for QPJ
2011/3/1 <[email protected]>:
Hi Paolo,
Please see attached zip file (small 2KB file)
It contains:
- A point shapefile with its CRS set to WGS84 UTM30N (prj file only)
and a
single point (located over the town of Kumasi in Ghana)
- A QGIS project in Google Mercator CRS.
When you load the shapefile into the project and then use the google
plugin
to display the satellite image around the point you could note that
the
satellite image is not what you expect (if you know the area).
Also, double click the shapefile layer and go to the General tab.
The CRS is
set to Google Mercator, not UTM30N.
Quit QGIS, rename the prj to qpj and do the above process again, and
all is
correct now.
I hope you can reproduce this behaviour.
Regards,
Benoit
On Tue, 01 Mar 2011 12:13:03 +0100, Paolo Cavallini
<[email protected]>
wrote:
Il giorno mar, 01/03/2011 alle 12.59 +0200, Tim Sutton ha scritto:
I tested with a shp that I use in training courses I give. For me
if I
rename the qpj, the prj is still recognised correctly.
Just checked: a shp with a prj, no qpj is recognized and
reprojected
correctly.
Could you please share the shp that gives you trouble?
All the best.
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