The Estonian Land Board (Maa-amet) Geoportal is the source of authoritative national geographic data for Estonia. It offers the base map, orthophotos, the national elevation model from lidar, addresses, and the cadastre.
Estonia is known for open, accessible geodata, and most products are free to use through downloads and extensive OGC services. The geoportal pairs with the Avaandmed open data portal to cover both base mapping and thematic public data.