[Qgis-user] Transformation using NTv2 grids

[Claas Leiner]

Look here:

http://www.gkg-kassel.de/pdf/Praezise_Transformation_im_QGIS_mit_Batchmodus.pdf

Cheers Claas


Am 17.02.2015 um 15:26 schrieb Bernd Vogelgesang:
> 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?
>
> Cheers
> Bernd
>
>
> Am 05.02.2014, 16:13 Uhr, schrieb Marco Hugentobler
> <marco.hugentobler at sourcepole.ch>:
>
>> Hi
>>
>>> Would it be possible to define a "Custom CRS" for the source CRS
>>> containing the
>>> nadgrids-stuff for doing ntv2 transformation in QGIS 2.0.1?
>>
>>
>> Yes, it is possible to work with custom CRS (although it is not so
>> convenient).
>>
>>> Is this already in 2.1?
>>> If yes, where could one find it?
>>
>>
>> There is a dialog showing the available datum transformations. This
>> dialog shows up as soon as a layer needs a datum transformation (e.g.
>> if on-the-fly reprojection is toggled or when doing save as').
>> However, the ntv2 transformation info has to be inserted into srs.db /
>> table datum_transform first.
>>
>> Regards,
>> Marco
>>
>> On 05.02.2014 15:42, Robert Nuske wrote:
>>> Hi Marco,
>>>
>>>> QGIS 2.2 will have support for NTv2 datum transformations as a core
>>>> function.
>>> Is this already in 2.1?
>>> If yes, where could one find it?
>>>
>>>
>>> Would it be possible to define a "Custom CRS" for the source CRS
>>> containing the
>>> nadgrids-stuff for doing ntv2 transformation in QGIS 2.0.1?
>>>
>>> For example GK3:
>>> "+proj=tmerc +lat_0=0 +lon_0=9 +k=1.000000 +x_0=3500000 +y_0=0
>>> +ellps=bessel
>>> +units=m +nadgrids=BETA2007.gsb +wktext"
>>>
>>>
>>> cheers,
>>>    robert
>>>
>>>
>>>> On 05.02.2014 13:34, Burgstaller Stefan wrote:
>>>>> Hi,
>>>>>
>>>>> is it already possible to reproject shape-files using NTv2 grids? I
>>>>> was looking for appropriate plugins, help documents and already
>>>>> available tools but I have not found anything. Since the federal
>>>>> states in Germany start to convert their geospatial data from
>>>>> Gauss-Kruger to ETRS89 with NTv2 grids this topic becomes more and
>>>>> more urgent.
>>>>>
>>>>> Greetings,
>>>>>
>>>>> Stefan Burgstaller
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> Qgis-user at lists.osgeo.org
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>>
>>
>
>