Atlas, an offline reverse Geo-coding library written in Java, inspired by reverse-geocoder.
The index is a double SortedMap<Double, Set<City>> that keeps an index
on both the latitudes and longitudes of the cities.
Clone this repository and add the library to your local Maven repos:
git clone https://github.com/bkiers/atlas.git
cd altas
mvn clean installAdd the following dependency to your project:
<dependency>
<groupId>nl.big-o</groupId>
<artifactId>atlas</artifactId>
<version>0.1.0</version>
</dependency>and use the library as follows:
// (lat, lng) somewhere in Venice
double lat = 45.436636;
double lng = 12.326413;
// Find a single city
City city = new Atlas().find(lat, lng);
System.out.println(city);
// City{
// geoNameId=3164603
// name='Venice'
// latitude=45.43713
// longitude=12.33265
// countryCode='IT'
// timeZone='Europe/Rome'
// admin1='Veneto'
// admin2='Provincia di Venezia'
// }
// Finds 3 cities around the (lat,lng) in a radius of 5 kilometers
List<City> cities = new Atlas()
.withLimit(3)
.withMaxDistance(5000)
.findAll(lat, lng);
for (City c : cities) {
System.out.println(c);
}
// City{
// geoNameId=3164603
// name='Venice'
// latitude=45.43713
// longitude=12.33265
// countryCode='IT'
// timeZone='Europe/Rome'
// admin1='Veneto'
// admin2='Provincia di Venezia'
// }
// City{
// geoNameId=3175265
// name='Giudecca'
// latitude=45.42477
// longitude=12.32906
// countryCode='IT'
// timeZone='Europe/Rome'
// admin1='Veneto'
// admin2='Provincia di Venezia'
// }
// City{
// geoNameId=3172456
// name='Murano'
// latitude=45.45857
// longitude=12.35683
// countryCode='IT'
// timeZone='Europe/Rome'
// admin1='Veneto'
// admin2='Provincia di Venezia'
// }In order to recreate the index, download the cities1000.zip
and unzip it in this project's ./data folder. Optionally also copy the files:
admin1CodesASCII.txt and
admin2Codes.txt to
the ./data folder.
To create a new index containing all cities, simply run:
mvn -q exec:java
mvn package
which will create a JAR file, atlas-VERSION.jar, inside the ./target folder
of approximately 5.6 Megabytes containing the entire index of all cities.
If you don't need all cities, you can create a smaller index. For example, if you want to create an index of the counties Spain and Portugal, do the following:
mvn -q exec:java -Dexec.args="ES,PT"
mvn package
to create an index of all countries without some, do the following:
mvn -q exec:java -Dexec.args="~JO,~SY,~LB,~EG"
mvn package -DskipTests -DargLine="-Xms512m -Xmx8g"