Reverse Geocoding
The process of converting geographic coordinates (latitude and longitude) into a human-readable address, place name, or ZIP code.
Reverse geocoding is the inverse of geocoding: given a pair of coordinates (e.g., from a GPS device or a map click), the system returns the nearest known address, place name, or administrative area. The result may include a street address, city, state, ZIP code, county, and country.
Reverse geocoding works by overlaying the input coordinates on reference boundary polygons (ZIP codes, city limits, counties) and address point databases. The accuracy depends on the density and quality of the reference data — urban areas with many address points yield precise results, while remote areas may return only a ZIP code centroid.
Common applications include mobile app location services ('What ZIP code am I in?'), fleet tracking, geotagged photo organization, and converting GPS coordinates from IoT devices into meaningful location labels.