In the CitySDK Linked Data API, data sets are called layers. Each layer can contain objects, and each object contains, per layer, key/value data. In the API, real-world objects like buildings, bus stops and municipalities are represented by objects, which can contain data on one or more layers. This way, multiple data sets can tell something about one single object. The data model and concepts are explained in detail on the about page, and in the project’s wiki.

The following layers are currently available via the Amsterdam instance of the CitySDK LD API. You can also view the results as JSON-LD using the /layers API.