What Is a Data Item?

A data item refers to a data element that can be composed of several data items. A data item is an indivisible minimum unit of data. The names of data items include number, alias, short description, length, type, and range of data items. A data item is the most basic and indivisible well-known data unit in a data record, and it is the smallest identification unit with independent meaning.

data item

A data item refers to a data element that can be composed of several data items. A data item is an indivisible minimum unit of data. The names of the data items are

The data item can be

Data item data element concept

A data element is the basic unit of data. Data elements are also called elements, nodes, vertices, records. A data element can consist of several data items (also called fields, fields, attributes).

Data (data) is a symbolic representation of objective things, raw raw materials used to represent objective things, such as graphic symbols, numbers, letters, etc. In other words, data are facts and concepts obtained through physical observation, and are descriptions of places, events, other objects or concepts in the real world.

Data item computer data element

In computer science, data refers to a general term for all media that can be input to a computer and processed by a computer program. It is a general term for numbers, letters, symbols, and analogs that are used to enter an electronic computer for processing. It is the most basic element of geographic information system.

Classification of properties

There are many types, divided by nature:

Positioning, such as various coordinate data;

Qualitative, such as data representing the attributes of things (residential places, rivers, roads, etc.);

Quantitative data that reflects the quantitative characteristics of things, such as geometric quantities such as length, area, and volume, or physical quantities such as weight and speed; Timely, data that reflects the time characteristics of things, such as year, month, day, hour, minute, and second Wait.

Classification of expressions

Divided by expression:

Digital data, such as various statistics or measurement data;

The simulation data is composed of continuous functions, and is divided into graphic data (such as points, lines, and areas), symbol data, text data, and image data. Divided into maps, tables, images, tapes, and paper tapes according to the recording method. Divided into vector data, grid data and so on according to digital methods. In the geographic information system, the choice, type, quantity, collection method, level of detail, and credibility of the data depend on the system's application goals, functions, structure, and data processing, management, and analysis requirements.