Tonttikartta

Tonttikartta resolves a Finnish address, place or property ID (kiinteistötunnus) and returns a short brief: the parcels and buildings, and which datasets cover the place (traffic noise, flood, protection, cultural heritage, planning). It does not repeat the data values. Instead it returns links that open the Tonttikartta map on the property with the right layers, where the official sources are linked. Use it to answer questions such as what is at an address, whether a property has planning or protection data, or to hand someone a map link for a view like noise or planning. Data is from Maanmittauslaitos (CC BY 4.0) and other Finnish authorities. Read-only, no account or API key. Not an authoritative source: check the municipality for building rights.