Hi Marco
On Mon, Feb 24, 2014 at 4:45 PM, Marco Hugentobler
marco.hugentob...@sourcepole.ch wrote:
Hi Martin
if some code in QGIS creates coordinate transform
without using transform provided by map renderer, it will be created
without the chosen datum transform and will therefore provide
On 02/24/2014 09:16 PM, Marco Hugentobler wrote:
Hi Leyan
I struggled quite a lot with the interface of a very famous
commercial GIS on this issue, I believe there is a real possibility to
do better here ! I think it is essential to allow the user to change
the transformation later easily,
Hi Martin
To me it sounds like an acceptable limitation to support just one
particular datum transformation at a time for one project.
I still think this limitation is not acceptable. Datum transformation is
a very approximate thing. Some transformation are well suited for
particular
Hi Leyan
I think it would be better to remove the towgs84 parameters for the
ellipsoids where there is no clear choice, and offer to set the datum
transformation, but I agree it is hard to go about it in a
user-friendly way.
Yes, it was the original behaviour to always ask the user, however
Hi Martin
if some code in QGIS creates coordinate transform
without using transform provided by map renderer, it will be created
without the chosen datum transform and will therefore provide
incorrect results
There is a lot of code and plugins that rely on the assumption that a
coordinate
On 02/24/2014 05:45 PM, Marco Hugentobler wrote:
- GUI: have a tab in project properties where non-default datum
transforms would be managed - instead of requiring the user to select
the datum transform immediately when the layer was added (and without
being able to change the decision later)
Hi Leyan
I struggled quite a lot with the interface of a very famous commercial
GIS on this issue, I believe there is a real possibility to do better
here ! I think it is essential to allow the user to change the
transformation later easily, maybe somewhere linked from the CRS choice
?
On Mon, Feb 24, 2014 at 1:35 PM, Leyan ouyang.leyan...@hotmail.com wrote:
On 02/24/2014 05:45 PM, Marco Hugentobler wrote:
- GUI: have a tab in project properties where non-default datum
transforms would be managed - instead of requiring the user to select
the datum transform immediately when
Hi (Marco)
I have some suggestions for the implementation of datum transforms in
QGIS and I would like to hear your opinion about them.
In the 2.2 release, as far as I understand the logic is implemented like this:
- map renderer emits a signal asking for datum transform choice
- map canvas
