I am working in an area which is laying in both CRS (WGS84/UTM-Zone 32 : EPSG 32632) and (WGS84/UTM-Zone 33 : EPSG 32633). I would like that the conversion from geographical coordinates WGS84 (EPSG=4326) to projected metric coordinates should be in a single reference in plotting maps, in (UTM) system with central Meridian set at 12°. Is it possible to customize this coordinate system in QGIS and what should be its WKT or Proj4?
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2There are literally an infinite number of spatial references that could meet your criteria, if you didn't insist on UTM (which is singularly unsuited to the task).– VinceCommented Jun 6, 2020 at 17:39
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You can shift the meridian to 12 degrees. The Proj string would looks like
+proj=tmerc +lat_0=0 +lon_0=12 +k=0.9996 +x_0=500000 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0
See: Is it possible create a custom UTM zone?
But ask youself if you really want to do that vs using a pre-defined projection with an ESPG code. You can really go down the rabbit hole here if you aren't careful.
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In fact, in the literature I found an example of a point in geographic system WGS84 (X_4326= 12.0809° & Y_4326=37.2733°) and its transformation to UTM system with central Meridian set at 12° (Easting=3007177 & Northing= 4126843). I tried many attempts to change the parameters of the Proj4 of CRS, but without success. We notice that the Easting includes 7 numbers (which normally it should be 6 numbers in UTM) so perhaps there is a great slipping in some parameters. Any help is welcome.– ennineCommented Jun 7, 2020 at 8:13