NSDI

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The United Nations Geographic Information Working Group (UNGIWG)
UNSDI-NCO GeoNetwork portal
The United States Geological Survey
Centre for Spatial Data Infrastructures and Land Administration Department of Geomatics, The University of Melbourne
GIS Resources
The Geoportal geoSerbia
The Finish Geoportal
The Lithuanian Spatial Information Portal
The Federal Geoportal of the Swiss Confederation
The Swedish Geodata Portal
The Federal Geographic Data Committee
The U.S. Government’s open data
Geoportal the Norwegian Mapping Authority
Geoportal of France
The Czech National Geoportal
geoportal.dgu.hr
The Italian National Geoportal
The Polish National Geoportal
The Estonian National Geoportal
The GEOSS Portal
Global Spatial Data Infrastructure Association
Malaysia Geoportal