If you care about accuracy, I suggest that you stay far away from batchgeocode.com. I uses the geocoder in Yahoo's API, which along with the lat/lon data returns two fields denoting the precion and warning of ambiguous parsing used. But the batchgeocode.com discards all that error-handling, and just plots whatever point Yahoo returned as its best guess! That might be grossly far away from the actual address point, such as a zip-code or city centroid, or it might be on a different street with a similar spelling, etc.
Address-based geocoding is inherently error-prone. If you have that many addresses to geocode, I would suggest using a professional-level geocoding service that returns precision/warning data. Then it is up to you to deal with the errors and ambiguities. Note, none of this even deals with precision differences related to interpolation errors, etc. That will depend on the quality of the underlying geocoding database and service. On Dec 29, 11:47 am, This Guy <[email protected]> wrote: > I am geocoding a huge number of environmental pollution sites (1 > million plus) and am trying to improve accuracy. I notice that the > api seems to be less accurate then the maps. Some address that didn't > code when sent in batch do code if I put them into a site > like:www.batchgeocode.com/lookup/or, with a small change (81nassau./demos/ > geocode/) I understand that they use teleatlas and navtaq respectivly, > right? It seems like this might be the problem. Does anyone have > nay any suggestions on improving accuracy? Should I try to add fuzzy > features (like eliminating township or twp). Or should I try to re- > code the address that don't have exact matches using some other > service? the problem is I will have a lot of them, at least 200,000. > > Any help at all would be greatly appreciated. > > Thanks, > > Sam --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
