This is a C library that allows you to find an area a point belongs to using a database file. A typical example would be looking up the country or timezone given a latitude and longitude. The timezone database also contains the country information.

The API should be self-explanatory from zonedetect.h. A small demo is included (demo.c)

In the future (after cleanup) I will also commit the program used to convert shapefiles to the binary database files and an automated testsuite.

You can test the library using an online API: https://api.bertold.org/geozone It takes the following GET parameters:

• lat: Latitude.
• lon: Longitude.
• c: Set to one (c=1) to produce compact JSON.

For example: https://api.bertold.org/geozone?lat=51&lon=5
You are free to use this API for any application, but I am not responsible for the quality of service. Please contact me if your application requires reliability.