[Qgis-developer] [Qgis-user] Transformation using NTv2 grids

[Bernd Vogelgesang]

Hi Giovanni,

thanx for your answer.

Just contacted the organization which might be in charge to answer the  
question about the circumstances to redistribute that file.

I hope we are talking of the same stuff: I mean this one  
http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/BETA2007.gsb or  
http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/BETA2007.gsa

Sorry, this topic is quite new for me, so I do not really know what I am  
talking about ;)

But do I see it correctly, that the "normal" way to reproject a layer with  
"Save as ..." will produce quite inaccurate results, and that the users  
have to be aware that they could/should use a plugin?
So there will be two ways to reproject the data,the default one (not so  
accurat) and a plugin version (more accurate)?

Cheers
Bernd

Am 17.02.2015, 16:13 Uhr, schrieb Giovanni Manghi  
<giovanni.manghi at gmail.com>:

> Hi Bernd
>
>
>> Hi there,
>> reactivating this thread and also pushing it to the dev list to maybe
>> receive a statement:
>>
>> Is it somehow planned to include the BETA2007.gsb and the resulting
>> changes into QGIS for 2.8 by default?
>>
>> I received already some questions, cause now even german bureaucracy is
>> waking up and tell users to switch to ETRS and transform the data from
>> Gauss-Krueger.
>> But for the majority of QGIS users, this will be rocket science if they
>> even learn THAT they have to create custom CRS, change srs.db entries  
>> and
>> do other wizardry.
>>
>> So far, googling "QGIS" and "BETA2007" yields no results on any moves  
>> into
>> this direction.
>> But without, QGIS users in Germany will likely produce tons of trash  
>> data
>> in the near future or already do so without knowing (me included till
>> today).
>>
>> Also see https://hub.qgis.org/issues/11347
>>
>> ... or is is not that critical as I believe it is?
>
>
> exactly because ntv2 transformations should not be rocket sciemce for
> the users, we (Portuguese qgis user group, with the initial help of
> Alexander Bruy) created this plugin
>
> http://www.qgis.pt/plugins/plugins.xml
>
> Given that you can redistribute the gsb files (and for Portugal this
> is possible) then the ntv2 transformations become trivial.
>
> I had already had a thought of expanding this plugin and adding the
> transfomations for countries that have available gsb grids and allow
> them to redistribute.
>
> If someone is interested or need it just let me know.
>
> Cheers
>
>
> ------------------------------------------------------------------------------------------
> Giovanni Manghi
> http://www.naturalgis.pt/
> * QGIS Desktop development
> * WebGIS development
> * QGIS and PostGIS Training
> -------------------------------------------------------------------------------------------


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