[PROJ] Management of datum grid files.

[Helmut Kudrnovsky]

>> Keep in mind, in the most cases in windows,  proj  is bundled with other
>> Software.
>>
>> E.g. OSGeo4W where proj needed files are living in  e.g.
>> c:\OSGeo4W\share\proj\ or in standalone winGRASS or qgis where  proj
>> needed
>> files are living in e.g. c:\programs\qgis\share-subfolder  and 
>> %PROJ_LIB%
>> is set accordingly.
>
>That's one of the reason to propose an installation-independent directory.
>That way different installations may be able to use the same grids & cache. 

so the idea is:

that e.g. OSGeo4W puts the proj shared things into %LOCALAPPDATA%, a
standalone GIS software depending on proj looks into %LOCALAPPDATA% if there
is a subfolder called e.g. proj? or the other way around, a standalone GIS
software depending on proj puts needed files into %LOCALAPPDATA%\proj and
OSGeo4W looks while updating/upgrading its proj version into %LOCALAPPDATA%
if there is a proj subfolder with shared folders? what if in
%LOCALAPPDATA%\proj are already files with the same name? should these be
just overwritten? how will be there a track of updated/ugraded/changed
shared proj files if different software are working/updating/upgrading them
at the same time? 

or should be set %PROJ_LIB% windows system wide (for all users? for just one
user in a multiuser network?) and a standalone GIS software depending on
proj/OSGeo4W while updating looks for %PROJ_LIB% instead of
%LOCALAPPDATA%\proj?

will this work in the windows side of the world? ;-)

I'm not against a consolidated way how to deal with proj supporting files
like grids and their big file sizes; with a _co-maintainer of winGRASS_ hat
on, I know, windows can be sometimes a hardly manageable beast ... here just
for well thought solution on the windows side of the world ;-)





-----
best regards
Helmut
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