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This article mainly introduces the meaning of data in the computer network, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let's take a look at it with you.

Data (data) refers to the symbols that record and identify objective events. It is the physical symbols or combinations of these physical symbols that record the nature, state and interrelationship of objective things. Data is the result of facts or observation, the logical induction of objective things, and the raw material used to represent objective things.

Data (data) is the result of facts or observation, the logical induction of objective things, and the raw raw material used to represent objective things. Data can be continuous values, such as sound, image, called analog data; it can also be discrete, such as symbols, text, called digital data.

Data refers to the symbols that record objective events and can be identified. it is the physical symbols or the combination of these physical symbols that record the nature, state and interrelationship of objective things. It is a recognizable, abstract symbol.

It not only refers to numbers in a narrow sense, but also can be a combination of words, letters, digital symbols, graphics, images, video, audio and so on, but also an abstract representation of the attributes, quantity, location and interrelationship of objective things. For example, "0, 1, 2..." , "overcast, rain, drop, temperature", "student records, cargo transportation" and so on are all data. After processing, the data becomes information.

In computer science, data refers to the general name of all the symbols that can be input into the computer and processed by the computer program. it is used to input the electronic computer for processing. a general term for numbers, letters, symbols and analog quantities that have a certain meaning. Computers store and process a wide range of objects, and the data representing these objects becomes more and more complex.

In a computer system, data is represented in the form of binary information units 0 and 1.

classification

1. Divided according to nature

Positioned by ①, such as various coordinate data

② qualitative, such as data that represents the attributes of things (settlements, rivers, roads, etc.)

③ quantitative data reflecting the quantitative characteristics of things, such as geometric quantities such as length, area, volume, or physical quantities such as weight, speed, etc.

④ timed data that reflects the time characteristics of things, such as year, month, day, hour, minute, second, etc.

2. Divided according to the form of expression

① digital data, such as various statistical or measurement data. Digital data is a discrete value in a certain interval [3]

② simulation data, composed of continuous functions, refers to the physical quantities that change continuously in a certain interval, and can be divided into graphic data (such as points, lines, surfaces), symbol data, text data and image data, such as the volume of sound and the change of temperature.

3. Divided according to the way of recording.

Maps, tables, images, tapes, paper tapes. According to the digital way, it can be divided into vector data, grid data and so on. In GIS, the selection, type, quantity, collection method, detail level and credibility of data depend on the application goal, function, structure and requirements of data processing, management and analysis of the system.

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