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We want to build a web service like google reverse geocoding.

Of course, we will only provide the service for only a specified region.

Then we want to know things we need to implement it.

By now, we have the pois,roads data of the region with ESRI Shapefile data.

Any suggestions?

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If you are using ESRI shapefile data, it probably already has address ranges for each road segment in the forms of four variables (e.g. LFROMHN --> LTOHN & RFROMHN --> RTOHN).

If not, you can satisfy this information with Census road edges.

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