What is a 3S system and what is its function?

"3S" system is a combination of geographic information system (GIS), global positioning system (GPS) and remote sensing system (RS).

GIS system is a data management system with information system space as its professional form. Strictly speaking, this is a computer system that centralizes, stores, operates and displays geographic reference information. For example, identify data according to its location in the database. Interns usually think that the whole GIS system includes the data of operators and input systems. Geographic information system technology can be applied to scientific investigation, resource management, property management, development planning, drawing and route planning.

GPS system uses low-frequency signals, which can maintain considerable signal penetration even in bad weather. Up to 98% global coverage; High-precision three-dimensional constant-speed timing; Fast, time-saving and efficient; Wide range of uses and diverse functions; Movable positioning. Different from the double-star positioning system, the receiver does not need to send any signals during use; This move increases the concealment and improves the efficiency of its military application.

RS system can obtain a wide range of data in a short time, and the information can be displayed in image and non-image ways, which can replace human beings to observe in difficult or dangerous places. Remote sensing technology is mainly used in navigation, agriculture, meteorology, resources, environment, planetary science and other fields.

Extended data

Application:

Digital map:

Digital maps are stored on the hard disk, floppy disk, magnetic tape and other media of the computer, and the map content is represented by numbers, which need to be displayed, read, retrieved and analyzed by special computer software. Digital maps can represent much more information than ordinary maps.

Digital map can easily combine and splice the elements of ordinary map in any form to form a new map. Digital maps can be drawn and output at any scale and range. Easy to modify, can greatly shorten the drawing time; It can be easily combined with satellite images, aerial photos and other information sources to generate new maps.

New data can be derived from the information recorded in the digital map. Digital elevation model is generated by using contour lines and elevation points of digital map, and the surface fluctuation is expressed in digital form, which can express the landform intuitively and stereoscopically.

Baidu Encyclopedia -3S