[Qgis-developer] Options:CRS:default datum transformations

Leyan ouyang.leyan.ml at hotmail.com
Fri Mar 14 18:54:47 PDT 2014

When you have a project with two layers in different datum and OTF 
transformation enabled, a dialog appears to ask how to transform between 
the two datums. Try it with a layer in WGS84 and a layer in Beijing 1954 
for example.

Once this datum transformation is chosen, it will be saved in this 
"Default datum transformations" list visible in the options. The - icon 
allows to remove a default datum transformation. The + icon seems to not 
have any effect for the moment. I expect someday it will allow to define 
directly a default datum transformation from the options?

I think this feature is very important but still needs a lot of polish 
to be actually usable, and should be hidden from the next release if the 
interface is not improved.



On 03/13/2014 10:03 PM, Larissa Junek wrote:
> Hello all,
> I'm writing the new user manual for QGIS Valmiera
> and introduce into the 'Default datum transformations' which is
> inserted in the Options Menu now.
> What conditions do I have to create so that I can transform a datum
> with the + and - Icons? Do i have to insert a grid shift file
> in usr/share/proj first?
> Thanks in advance,
> Larissa
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