[Qgis-developer] Projection parameters for french NTF

[Laurent C.]

2006/9/28, Tim Sutton <tim at linfiniti.com>:
> Hi
>
> Magnus Homann just raised a similar issue for Swedish projections. When we
> created the srs.db the idea was we should not change projections with
> official EPSG/PGIS ID's. The idea being that we would update the database
> before a release with any upstream corrections  (coming from spatial_ref_sys
> table in postgis unless there is a more official source). So this means
> three things:
>
> 1) we need to decide what will be the cananical source for SRS descriptions
> (Im leaning towoards postgis / spatial ref sys table
> 2) we find a way to get suggested changes into the upstream srs source if
> they originate from our users
> 3) we need to come up with a manageable way to synchronise the srs.db that
> is distributed with qgis with the canonical srs source.
>
> If anyone is interested to take on some or all of these aspects  it would be
> great. It doesnt require any coding knowledge as such and would be a very
> useful contribution to QGIS. In the mean time the best way to  introduce
> changes to the distributed srs.db is in the form of a simple sql update
> command patch that will update the records in the sqlite database correctly
> (but running the risk of later undoing if these changes have not made it to
> the upstream source of srs defs too.
>
> Regards
>
> Tim
>

Hello,

Thanks for your answer.
After some tests, the correct +Lon_0 value for NTF seems to be 0.
So proj-4.5.0 ship with the right values.

I don't understand SQL, so I can't send a command patch. I can send my
modified srs.db though.

Laurent