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Updated towgs84 parameters of JTSK CRS, the towgs84 values were calcu… 
…lated for area of Czech and Slovak Republic as it is described here: http://grass.fsv.cvut.cz/gwiki/%C4%8Ceskoslovensk%C3%BD_transforma%C4%8Dn%C3%AD_kl%C3%AD%C4%8D

UPDATE tbl_srs set parameters = '+proj=krovak +lat_0=49.5 +lon_0=24.83333333333333 +alpha=30.28813972222222 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=542.5,89.2,456.9,5.517,2.275,5.516,6.96 +pm=greenwich +units=m +no_defs' WHERE auth_id = '5513';

UPDATE tbl_srs set parameters = '+proj=krovak +lat_0=49.5 +lon_0=24.83333333333333 +alpha=30.28813972222222 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=542.5,89.2,456.9,5.517,2.275,5.516,6.96 +pm=greenwich +units=m +no_defs' WHERE auth_id = '5514';

UPDATE tbl_srs set parameters = '+proj=krovak +lat_0=49.5 +lon_0=42.5 +alpha=30.28813972222222 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=542.5,89.2,456.9,5.517,2.275,5.516,6.96 +pm=ferro +units=m +no_defs' WHERE auth_id = '5221';

UPDATE tbl_srs set parameters = '+proj=krovak +lat_0=49.5 +lon_0=42.5 +alpha=30.28813972222222 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=542.5,89.2,456.9,5.517,2.275,5.516,6.96 +pm=ferro +units=m +no_defs' WHERE auth_id = '2065';

UPDATE tbl_srs set parameters = '+proj=krovak +lat_0=49.5 +lon_0=24.83333333333333 +alpha=30.28813972222222 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=542.5,89.2,456.9,5.517,2.275,5.516,6.96 +pm=greenwich +units=m +no_defs' WHERE auth_id = '102067';
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@blazek
blazek committed Jun 12, 2013
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2 comments on commit 2ffbbde

@Andre-J
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Unfortunately, the source you have linked to no longer exists. Can you give another source for your towgs84 parameters? Unfortunately, the GDAL that comes with OSGEO4W and Ubuntu still uses the 3-parms-version by NIMA, which is surely less accurate. But you might end up with some nasty offsets if QGIS runs GDAL commands in the background.
I checked the EPSG database, which is the ultimative source for GDAL parameters. They offer different values for the Czech Republic and Slovakia, but none of them meet yours.

@blazek
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@blazek blazek commented on 2ffbbde Aug 24, 2015

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It should be this one: http://freegis.fsv.cvut.cz/gwiki/S-JTSK_/_%C4%8Ceskoslovensk%C3%BD_transforma%C4%8Dn%C3%AD_kl%C3%AD%C4%8D

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