What are GIS, GPS and RS?

GIS geographic information system-a computer system specialized in processing geospatial data, referred to as "geographic information system" or "GIS". Geographic Information System (GIS) is a computer-based tool, which can draw and analyze things and events existing on the earth. GIS technology combines the unique visualization effect and geographical analysis function of maps with general database operations (such as query and statistical analysis). This ability makes GIS different from other information systems, which makes it of practical value in explaining events, forecasting results, planning strategies and other fields of public and individual enterprises and institutions.

GPS Global Positioning System-GPS is a new generation of space satellite navigation and positioning system jointly developed by the US Army, Navy and Air Force in 1970s. Its main purpose is to provide real-time, all-weather and global navigation services for land, sea and air, and it is also used for some military purposes such as intelligence gathering, nuclear explosion monitoring and emergency communication. After more than 20 years of research and experiments, it cost 30 billion dollars. By1March 1994, 24 GPS satellite constellations with global coverage of 98% had been deployed. In the field of machinery, GPS has another meaning: geometric product specifications-GPS for short.

RS remote sensing technology refers to non-contact and long-distance detection technology. Generally speaking, it refers to the theory, method and applied science and technology that uses sensors/remote sensors to detect the radiation and reflection characteristics of electromagnetic waves of objects and analyze the properties, characteristics and states of objects according to their characteristics.

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