So you were trying to get rid of mongodb as a backend, and you ended up at writing your own? Well I'm not sure how set you are on that, but maybe you should look into some other databases, what did you dislike about mongo?
And yeah, with such a specific goal, you could very well make a very nice niche DB that optimizes for the kind of data you're trying to search! Especially with map data becoming more and more important, I think it's actually a pretty awesome idea.
However, I would say that you should go in with the intent to make a kickass latitude-longitude database, rather than just having it be a piece of something you're trying to push to production (you have better things to worry about with something that's going to production -- don't make the db one of them)
You never know, you might find that the database is the more important project!
And yeah, with such a specific goal, you could very well make a very nice niche DB that optimizes for the kind of data you're trying to search! Especially with map data becoming more and more important, I think it's actually a pretty awesome idea.
However, I would say that you should go in with the intent to make a kickass latitude-longitude database, rather than just having it be a piece of something you're trying to push to production (you have better things to worry about with something that's going to production -- don't make the db one of them)
You never know, you might find that the database is the more important project!