Suppose you use various geocoding facilities (like Mapquest's API, Texas A&M's, etc.) to get a latitude-longitude pair for a given address in the United States. They give you differing answers, sometimes miles apart from one another. How should you choose among them?
Well, I suppose you can inspect the various answers on Google Maps or similar and see which makes the most sense. But now suppose you're doing this for a large dataset, where it is very impractical to inspect all the answers; you want an automated way to do it. What should you do?
I will gladly accept answers of any of the following forms:
- a way to choose among the answers obtained
- which might simply be a single authoritative data source to believe even if others disagree (in which case there's no need to check multiple sources in the first place, unless the good one has missing data)
- a way to find some sort of mean value among the answers obtained