Skip to content
Permalink
Browse files

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';
  • Loading branch information
blazek committed Jun 12, 2013
1 parent 9e14b8e commit 2ffbbded16fa8f4425ccb1be4a04186a43b93754
Showing with 0 additions and 0 deletions.
  1. BIN resources/srs.db
BIN +0 Bytes (100%) resources/srs.db
Binary file not shown.

2 comments on commit 2ffbbde

@Andre-J

This comment has been minimized.

Copy link

@Andre-J Andre-J replied Aug 24, 2015

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

This comment has been minimized.

Please sign in to comment.
You can’t perform that action at this time.