others (#15) - speed up routing - how? (#326) - Message List

Hey folks,

I know that there are already some threads about this topic. But I think some of us have already figured out the intrinsic problem, so we can start from a higher level. We should agree, that in order to speed up routing prereduction of data is necessary. This may be implemented by using bboxes at the start and end points and for the rest regarding only higher level streets. But, as some of us already figured out, this is not always the best solution. I mean the missing density of main-street topology in some areas. Also if your shortest path is shaped like a 'C' you'll get poor and mostly no results. My idea, and I've already read the same thought in one older thread here, was to raise important minor streets to a higher priority. So what do you think? Does anyone has some clever PostGIS-Code that can do that? e.g. Creating a main grid and then precalculate some major paths?