[Qgis-user] EPSG:27700 - OSGB 1936 / British National Grid shapefiles are incorrectly interpreted by QGIS 1.8.0 and later

[Even Rouault]

> I'm not sure what is being suggested here as a fix. Is it going back to the
> pre 1.8.0 solution or providing an alternative CRS that the user will need
> to select for all affected layers in every project? If the latter it will
> potentially cause problems for those of us sharing projects between machines
> using different version of QGIS.

I don't guarantee it will solve your whole workflow. It will certainly solve how
EPSG:27700 is expanded to a PROJ.4 string (when reprojection is needed), by
reverting to the way it used to be expanded in older GDAL versions.

That said, I'm not sure how and if QGIS manages to identify the ESRI .prj file
you mentionned with EPSG:27700.

>
> Sorry - I'm just having trouble getting my head around this!

All thoses SRS have been precisely invented for that ;-)

>
> Andrew Chapman
>
> -----Original Message-----
> From: Even Rouault [mailto:even.rouault at mines-paris.org]
> Sent: 31 January 2013 12:24
> To: Andrew Chapman
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] EPSG:27700 - OSGB 1936 / British National Grid
> shapefiles are incorrectly interpreted by QGIS 1.8.0 and later
>
> Selon Andrew Chapman <andrew.chapman at donkagen.co.uk>:
>
>
> There's a GDAL ticket about that : http://trac.osgeo.org/gdal/ticket/4597
>
> Frank, I've attached in it a libgeotiff patch that should solve this by
> defining an override.
>
>
>