[Qgis-developer] default datum transformations

[Marco Hugentobler]

Hi Richard

It is most convenient to let QGIS enter the content for the datum 
transformations for you. Clicking +/- in the option assumes you know the 
src/dest Ellipsoids and the numbers from the transformation table (it is 
mostly there to have a convenient way to delete the entries).

Instead, check the box 'Ask for datum transformation when no default is 
defined' in the option dialog. Then reproject a layer in the map window, 
a dialog shows up asking you to pick a datum transformation. In this 
dialog, check 'Remember selection'. You now have an entry in the option 
table and QGIS automatically uses the selected datum transformation for 
further transformation between these two CRSs.

Regards,
Marco

On 10/20/16 19:36, Richard Duivenvoorde wrote:
> Devs,
>
> here at a talk about crs and proj...
>
> looking at the crs tab of the options dialog, I see options about
> "Default datum transformations", see this screendump:
>
> http://storage1.static.itmages.com/i/16/1020/h_1476984799_4613200_82151ac927.png
>
> When I push the + and - button I see that rows are added in the table,
> but I cannot see anything in it (all stays white as in screendump).
>
> Somebody here who can tell me how this should work? Or what I'm doing
> wrong that I do not see a dialog or so?
>
> Regards,
>
> Richard Duivenvoorde
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch