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2. Virtual Singapore - Wikipedia

   en.wikipedia.org/wiki/Virtual_Singapore

   Virtual Singapore is a 3D digital model of Singapore that uses real-time and topographical data. It is a digital twin of the city-state , and the first digital twin of a country. Virtual Singapore is co-led by the National Research Foundation, the Singapore Land Authority (SLA) and the Government Technology Agency .

3. Open Geospatial Consortium - Wikipedia

   en.wikipedia.org/wiki/Open_Geospatial_Consortium

   The Open Geospatial Consortium (OGC) is an international voluntary consensus standards organization that develops and maintains international standards for geospatial content and location-based services, sensor web, Internet of Things, GIS data processing and data sharing. The OGC was incorporated as a not for profit in 1994.

4. List of online map services - Wikipedia

   en.wikipedia.org/wiki/List_of_online_map_services

   GeoInfo Map [1] – a geospatial information service provided by the Hong Kong Special Administrative Region (HKSAR) Government. Common Spatial Data Infrastructure Portal aka CSDI – a portal providing information infrastructure to share spatial data in Hong Kong for smart city development.

5. List of GIS data sources - Wikipedia

   en.wikipedia.org/wiki/List_of_GIS_data_sources

   This is a list of GIS data sources (including some geoportals) that provide information sets that can be used in geographic information systems (GIS) and spatial databases for purposes of geospatial analysis and cartographic mapping. This list categorizes the sources of interest.

6. GeoSPARQL - Wikipedia

   en.wikipedia.org/wiki/GeoSPARQL

   GeoSPARQL is a model for representing and querying geospatial linked data for the Semantic Web.It is standardized by the Open Geospatial Consortium as OGC GeoSPARQL. [1] The definition of a small ontology based on well-understood OGC standards is intended to provide a standardized exchange basis for geospatial RDF data which can support both qualitative and quantitative spatial reasoning and ...

7. OGC Reference Model - Wikipedia

   en.wikipedia.org/wiki/OGC_Reference_Model

   The OGC Reference Model describes a framework for the ongoing work of the Open Geospatial Consortium (OGC) and their specifications and implementing interoperable solutions and applications for geospatial services, data, and applications. It is not an OGC standard.