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What country is at a particular latitude/longitude? This tiny Android library (less than 100kB) tells you in 50 milliseconds, without using the Internet and without requiring any permission.

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coordinates2country/coordinates2country-android

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coordinates2country-android

What country is at a particular latitude/longitude? This tiny Android library (less than 100kB) tells you in 50 milliseconds, without using the Internet and without requiring any permission.

  • Fast reverse geocoding
  • Never needs an Internet connection

For the Java desktop/server version, see https://github.com/coordinates2country/coordinates2country.

Use

This sample Android app that uses the library might help.

1) Import the library

If using Gradle:

implementation("io.github.coordinates2country:coordinates2country-android:1.8") { exclude group: 'com.google.android', module: 'android' }

For other build systems or for the JAR, search for the latest version on Maven Central.

At the top of your Java file, after the package declaration, insert this line:

import io.github.coordinates2country.Coordinates2Country;

2) Call the library

Coordinates2Country.country(-23.7, 39.8) returns the String France.

If you prefer identifiers, Coordinates2Country.countryQID(-23.7, 39.8) returns 142, the Wikidata QID number of France.

Build

Run ./gradlew build -x test, or ./build.sh if you modified anything in the data folder.

Generate the gray map

  • Open countries.xcf in Gimp
  • Image > Duplicate
  • Colors > Components > Extract component > RGB Red
  • File > Export As
  • Filename: data/countries-8bitgray.png
  • Export > 8bpc GRAY

When modifying the map, you can modify colors to see better, as long as you keep the RGB red component.

Info

Source image: https://commons.wikimedia.org/wiki/File:Internationalwaters.png Kvasir Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.

Projection: https://en.wikipedia.org/wiki/Equirectangular_projection with phi0=0 and lambda0=0

Useful maps: https://farm8.staticflickr.com/7292/10134658063_fca4fc3da2_o.jpg https://i.imgur.com/lzm0fWN.png

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What country is at a particular latitude/longitude? This tiny Android library (less than 100kB) tells you in 50 milliseconds, without using the Internet and without requiring any permission.

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