What is geographic information technology?

Geographic information technology includes:

1, remote sensing

Using spacecraft and modern electronic and optical instruments to detect and identify distant research objects.

2、GPS

GPS can receive the signal on the earth's surface at any time, any place and any weather, and get the accurate three-dimensional absolute or relative position, accurate time and speed of the GPS receiver in real time or through post-processing. It has all-round (land, ocean, aviation and aerospace), global, all-weather, continuous and real-time navigation, positioning and timing functions.

3. Geographic Information System

From simple computer drawing, spatial database management, GIS model to spatial reasoning, the development of GIS technology has expanded the scope of geographic information technology.

Characteristics of various geographic information technologies:

I. Characteristics of Geographic Information System

1, the basis of public geographic positioning.

2. Ability to collect, manage, analyze and output various geospatial information.

3. The system is driven by analysis model, which has strong spatial comprehensive analysis and dynamic prediction ability, and can generate high-level geographic information.

4. It is a man-machine interactive spatial decision support system for geographical research and decision-making.

Second, the characteristics of GPS

1, global and all-weather continuous navigation and positioning capability.

GPS can provide continuous and all-weather navigation and positioning capabilities for all kinds of users anywhere in the world or near-earth space, and users do not need to transmit signals, so it can meet the needs of multiple users.

2. Real-time navigation, high positioning accuracy and short observation time.

When GPS is used for positioning, the position data can be obtained many times in1s. This near-real-time navigation capability is of great significance to highly dynamic users, and it can also provide users with continuous three-dimensional position, three-dimensional speed and accurate time information.

At present, the real-time positioning accuracy with C/A code can reach 20-50m, the speed accuracy is 0. 1m/s, and the relative positioning accuracy can reach millimeter level after special processing.

Refer to the above? Baidu encyclopedia -—GIS

Refer to the above? Baidu encyclopedia-global positioning system

Refer to the above? Baidu Encyclopedia-Remote Sensing