Is it possible create a custom UTM zone?

Question

I'm trying to detect the CRS (coordinate reference system) of a layer, but it is between

WGS 84 / UTM zone 32N

and

WGS 84 / UTM zone 33N

In fact the definition shows srsName="GEOPOIUTM32.5" srsDimension="2"

But I can't find any SRS like this in QGIS.

@mkennedy I know how to create a custom UTM zone with integers, but I dont know if have any sense a zone and a half — Daniel Pardo, Commented May 19, 2017 at 22:33
I'm afraid I don't understand what you're getting at. To me, 32.5 means that the central meridian is halfway between 32's and 33's, thus, 12E with all other parameters remaining the same. I could be wrong though! — mkennedy, Commented May 19, 2017 at 22:37
can you edit your question to include (a) your .prj file (if it's a shapefile) or the output from gdalinfo if it's a raster, (b) the area you're looking at and (c) how old is the map. I found a possible match on spatialreference.org but not sure unless you can post more info. — Steven Kay, Commented May 19, 2017 at 23:38
The zone number in +proj=utm surely works only for integer values, representing 6-degree-wide zones. But there have been 3-degree-wide transverse mercator projections in the past, like the German and Russian Gauss-Krueger system. — AndreJ, Commented May 20, 2017 at 5:20

Mike -EZUSoft- · Accepted Answer · 2017-05-20 09:05:52Z

3

32N: Central meridian 9

33N: Central meridian 15

32,5: Central meridian 12

Create a new CRS with these parameters

+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

I found gml data here

In QGIS with User define CRS it's look like:

answered May 20, 2017 at 8:42

Mike -EZUSoft-

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Yes! Thanks @Mike. Yours CRS definition works perfectly!
– Daniel Pardo
Commented May 22, 2017 at 10:14

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