Find a location given approximate latitude and longitude near the location
Posted on 2003-11-16
I have a gps-related Oracle problem that I can use some help with.
Here is the scenario that I am trying address in Oracle 188.8.131.52:
I have the following tables with latitude and longitude stored in decimal
1. Bus stops along with their exact latitude and longitude.
2. Bus riders along with the approximate latitude and longitude of where
they boarded a bus. I cannot assume that I will have the exact
coordinates, only a reasonably close approximation.
Can anyone help me with a solution that, given the latitude and longitude
where a rider boarded, will return the bus stop where they boarded? The
coordinates where the rider boarded will be guaranteed to be within a specified distance of the bus stop latitude and longitude.
This problem is outside the day-to-day programming issues that I normally deal with and I am woefully deficient in the math department. I'm totally at a loss as to where to begin, so specific calculations, formulas, sql and/or PL/SQL code would be welcome. In any case, ANY help or advice on how to proceed is much appreciated.