DEEN
The Address Data System (ADS) is Estonia's central address and geo-coordinate database, operated by the Land and Spatial Development Board (Maa- ja Ruumiamet). For every address it provides a unique ID and the associated parcel, building and geometry. The largest consumers are the TEHIK health systems (patient portal, Digilugu) at about 47 % of the load, followed by the Ministry of Finance and geodata providers.
The ADS services fall into four clusters — spatial object queries (the main load), text address search, data maintenance & feedback, and delta streams. Shares are daily averages over Dec 2025 – May 2026. Each cluster has its own detail page.
The most-used service endpoints across all four clusters, as requests per day. The cluster pill links to the detail page.
| # | Service | Cluster | Calls / day | Avg ms |
|---|
How do the roughly 443,000 calls/day flow from the service clusters to the 16 largest consumers?
Unusual profile: a daytime plateau plus a clear evening peak around 20:00 — driven by the TEHIK patient portal, which citizens check after work, resolving addresses in the process.
What the aggregate data reveals about the ADS address system.
Via the patient portal and Digilugu, TEHIK drives about 47 % of all ADS queries — nearly every patient session resolves a residential address. The central address DB thus works mostly for healthcare.
Unusual for government infrastructure: ADS peaks not in the morning but in the evening — when citizens log into the patient portal after work.
About 58 % of queries are not address text inputs but geo-object lookups (parcel, building, apartment by ID). ADS is thus less a search engine than a geocoding backend for other registers.