definition
Geographic information system or geographic information system (GIS) is sometimes called "geographic information system" or "resource and environment information system". It is a specific and very important spatial information system. With the support of computer hardware and software system, it is a technical system that collects, stores, manages, calculates, analyzes, displays and describes the relevant geographical distribution data of the whole or part of the earth's surface space (including the atmosphere).
Inclusion technology
Geographic information technology is "3S" technology, including geographic information system (GIS), remote sensing (RS) and global positioning system (GPS).
Basic characteristics?
Through the above analysis and definition, we can put forward the following basic concepts of GIS: the physical shell of GIS is a computerized technical system, which consists of several interrelated subsystems, such as data acquisition subsystem, data management subsystem, data processing and analysis subsystem, image processing subsystem, data product output subsystem and so on. The quality and structure of these subsystems directly affect the hardware platform, function, efficiency, data processing mode and product output type of GIS.