[gdal-dev] Request for reintroduction of an override line into gcs.override.csv

[Schmid Andreas]

Hi

I hope this is the right mailing list to ask the following:

I've realized that in GDAL 1.9.2 the "towgs84" parameters of the Swiss "CH1903" GCS (EPSG:4149) appear incorrectly. According to [1], they should be
674.374,15.056,405.346,,,,
instead of
674.4,15.1,405.3,,,,
It seems that the origin of these rounded values is the EPSG database. In order to override them, I had to add the following line to the gcs.override.csv file:
4149,CH1903,6149,CH1903,6149,9122,7004,8901,1,0,6422,1766,1,9603,674.374,15.056,405.346,,,,

The same (almost same) line used to be included in the gcs.override.csv file until GDAL 1.7.3: [2]
Would it be possible to re-include this override line into the gcs.override.csv?

Thank you,
Andy


[1]: Formulas and constants for the calculation of the Swiss conformal cylindrical projection and for the transformation between coordinate systems, chapter 1.4: http://www.swisstopo.admin.ch/internet/swisstopo/en/home/topics/survey/sys/refsys.parsysrelated1.2487.downloadList.82881.DownloadFile.tmp/swissprojectionen.pdf
[2]: https://github.com/OSGeo/gdal/blob/733829bf6f88530a92c25457a0f4d0ef0eb5f03a/gdal/data/gcs.override.csv#L29-L31


Andreas Schmid
GIS-Informatiker


Amt für Geoinformation
SO!GIS-Koordination
Rötistrasse 4
4501 Solothurn

Telefon +41 32 627 75 93
Telefax +41 32 627 75 98
andreas.schmid at bd.so.ch
http://www.so.ch