The ČÚZK Geoportal is the access point for authoritative Czech geographic data, run by the Czech Office for Surveying, Mapping and Cadastre. It distributes the cadastral map, topographic databases, orthophotos, and elevation models.
Many products are available free of charge through downloads and OGC web services (WMS, WFS), and the cadastre is among the most-used national datasets. It is the reference source for precise Czech base mapping beyond the general open data catalog.