[Gdal-dev] Re: Supported projections/transformation in a GUI

[Tomas R]

As I thought, no easy way...

If there was, a reply would have found the way to this thread.

Tomas R skrev:
> Ok folks, here is question to crack.
>
> Simple idea:
> User can pick either a file with geo-data in it or an image without.
> If it is a file without geo-data the user is to be able to select 
> which projection/coordinate system the image is saved in and also set 
> up the coordinates of the edges of the map.  A transformation of 
> coordinates between map local projection and WGS84 will the be set up.
>
> My big problem is the case with no geo-data. I need to set up an 
> interface which an ordinary user can use, a user with not to much 
> experience of projections and such stuff.
>
> Firstly I need to sort out which, in GDAL, available projections that 
> are common. Just to reduce the list.
> Next I need to find a friendly name to present them with.
> If possible - sort them corresponding to where they are used, for 
> example  the user can select USA and get all the UTM-zones (and by 
> knowing the coordinates of the map select the right zone). Or replace 
> USA with a European country and their specific common projections.
>
> I'm a bit lost, don't know where to start. The ideas above is just 
> loose ideas.
>
> Suggestions? Any tools in GDAL that can help me? Anyway to look up the 
> available projections in GDAL? Anyway to sort out the "valid" 
> projections?
>
> Working with GDAL from C#.
>
> Pls
> /tomas