[Qgis-developer] [gdal-dev] Fix for QGIS 2.2+ Projection issue with OSGB36 NTv2

[Bruce, Bob (CWS)]

Marco,
            I think that is a great idea to ship GSB files with QGIS. If the developers of GDAL were to make a decision to bundle them then QGIS should just make use of them. We often encounter datasets in older datums/adjustments and need to use these files.

Thanks,
            Bob Bruce

From: qgis-developer-bounces at lists.osgeo.org [mailto:qgis-developer-bounces at lists.osgeo.org] On Behalf Of Marco Hugentobler
Sent: March-14-14 8:45 AM
Cc: qgis-developer
Subject: Re: [Qgis-developer] [gdal-dev] Fix for QGIS 2.2+ Projection issue with OSGB36 NTv2

Hi

The info for OSGB36 NTv2 is in srs.db now.

>Makes me think - could QGIS ship with the freely available gsb grids, in an optional package (say qgis-datum-grids)?  It would be rather convenient, especially as QGIS now >supports them (but does not ship with any grids yet, unless mistaken).

I'm receiving frequent suggestions of bundling .gsb files with QGIS. The problems I see with this are:
- It adds the extra MB for QGIS too.
- They come with various licences.
- .gsb files are usefull for all tools working with proj. So a logical choice would be to have an optional package for proj4.

Regards,
Marco

On 13.03.2014 18:20, Etienne Tourigny wrote:

On Thu, Mar 13, 2014 at 4:27 AM, Marco Hugentobler <marco.hugentobler at sourcepole.ch<mailto:marco.hugentobler at sourcepole.ch>> wrote:
Hi

I'm adding the entries for OSGB36 NTv2 to srs.db.
For the .gsb file, you could probably contact the proj4 project if they want it to distribute it togethere with the library (if the license allows that).


I guess that's unlikely they would add it to the binary packages, as it would add a few MB to the base install.  But they might add it to proj-datumgrid-1.5.zip (which contains many free datum files), as the licence for the grid is BSD.

Makes me think - could QGIS ship with the freely available gsb grids, in an optional package (say qgis-datum-grids)?  It would be rather convenient, especially as QGIS now supports them (but does not ship with any grids yet, unless mistaken).

cheers,
Etienne


Regards,
Marco


On 11.03.2014 18:23, Etienne Tourigny wrote:
You email should be sent to the qgis-developer list (this is the gdal-dev list), which I am forwarding this to.

On Tue, Mar 11, 2014 at 7:44 AM, Nicholas Duggan <dragons8mycat at live.co.uk<mailto:dragons8mycat at live.co.uk>> wrote:
Hi all,

I'm trying to get my fix for the OSGB36 to WGS84 using Ordnance Surveys OSTN02 (NTv2) transformation into the QGIS master. Nathan Woodrow recommended I bring it up with you guys who might be able to implement it.

Essentially I've updated the QGIS srs.db and put the OSTN02_NTv2.gsb in the Share/Proj folder, full description and files are here: http://dragons8mycat.wordpress.com/2014/03/03/gis-tips-getting-ostn02-to-work-with-qgis-2-2/

Is this something which can be implemented by yourselves or can you point me in the right direction for getting it put in the master/future releases?

Thanks,

Nick D (@dragons8mycat)

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Dr. Marco Hugentobler

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Technical Advisor QGIS Project Steering Committee

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Sourcepole -  Linux & Open Source Solutions

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Technical Advisor QGIS Project Steering Committee
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