The Arctic SDI Topographic Basemap is a WMTS service provided by Arctic SDI - a cooperation between the national mapping agencies in Canada, Denmark, Finland, Iceland, Norway, Russia, Sweden and US. It contains basic topographic information coming from these authoritative data sources:: Canada Centre for Mapping and Earth Observation - National Resources Canada, Danish Agency for Data Supply and Efficiency, National Land Survey of Finland, National Land Survey of Iceland, Norwegian Mapping Authority, Norwegian Polar Institute, Russian Federal Service for State Registration, Cadastre and Mapping, Swedish Mapping, Cadastre and Land Registration Authority and United States Geological Survey.