Dart library for super-fast offline reverse geocoding. Package use k-d tree for a search of the nearest location in a given file. One when Geocoder is initialized, search for location is super-fast, about 4-5 milliseconds.
For using the reverse geocoding library you need to provide а file with data about places among you want to run reverse geocoding. In examples you can see how to use а library with two example files:
- GeoNames data file with all world cities with a population above 15 000
- USGS data file with USA cities with a population above 5000.
Library allows you to use any other file who has at least data about name, latitude, and longitude of places you want to search.
var geocoder = GeocodeData( File('/example/NationalFedCodes_20191101.csv').readAsStringSync(), //input string 'FEATURE_NAME', // place name header 'STATE_ALPHA', // state/countery header 'PRIMARY_LATITUDE', // latitute header 'PRIMARY_LONGITUDE', // longitude header fieldDelimiter: ',', // fields delimiter eol: '\n');
List<LocationResult> result = geocoder.search(41.881832, -87.623177);
Features and bugs
If you any problem using library or you have any new needs, please file feature requests and bugs at the issue tracker.