Given your (yet to be written) project proposal gets accepted I'ld like to consider mentoring it since I have got a lot of GIS experience/background over the last 10-15 years or so.
But I think that you should make your project proposal well focused to a narrow domain to be doable in the short timeframe provided by GSoC. Either topic (spatial indexing and coordinate transformations) are rather complex and I doubt these are small enough to be finished in 3 months (as long as you don't have any partial implementations available, that is).
Hi Hartmut! Thanks for your interest. We don't have any partial implementations yet, so maybe it's a good idea to only take the spatial indexing part (that is more interesting to me). I only have some experience using other implementations and hacking them. So, I'll start with the proposal this days and start asking questions about it..! :) Hope you and Barend can answer..!! :D Any general advice? -- federico