I'm trying to convert "unknown" CRS of the shp to the WGS84 UTM zone N34. I've tried to do it with saving of shp in different CRS (Save as) but I did not succeeded. I've checked the situation with open layers and using of on-the-fly transformation and matching is far from perfect (500-600 m difference).

Unknown CRS has been showed in QGIS as USER 100001 with the following parameters: * Generated CRS (+proj=tmerc +lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0 +ellps=bessel +units=m +no_defs)

It should be a Gaus Kruger projection (Bessel 1841) for Serbia. I've tried also with changing of shp and open layer to MGI 1901/Balkans zone 7 and MGI/3-degree Gauss zone 7 but the situation is the same.

Note: Shapefiles should be very precise as they were obtained by the Public Enterprise. Unfortunately, they're not interest in delivery of the shapefile in a different CRS.

I would be very greatful if someone could help me regarding this issue.

  • I did not get everything, I understood first the shape file did not come with the *.prj file, then where the "+proj=tmerc +lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0 +ellps=bessel +units=m +no_defs" came from? – Marco Oct 4 '17 at 12:09
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  • What happens if you include a +towgs84 parameter? Try using +towgs84=577.889,165.222,391.183,4.9145,-0.94729,-13.05098,7.78664 See EPSG registry, transformation 7676. – mkennedy Oct 4 '17 at 14:11
  • I've received *.prj file (together with cpg, dbf, snb, sbx, shx and shp). I've tried it before Kazuhito @mkennedy nope, it's the same situation. Parameters that I received are correct for sure, I just need to realize how to transform shp to WGS84 UTM zone N34. I'm a noob for GIS so sorry if I'm not perfectly clear. Do you have other suggestions?Thanks guys for your help so far. – Dragan Kovačević Oct 5 '17 at 7:55
  • Is the data freely available? If so, link? Otherwise...if you want to send it to me, I'll delete it the minute I'm finished. My username @ esri .com – mkennedy Oct 5 '17 at 11:08

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