1、 1KB = 1024 b； 1MB = 1024KB = 1024× 1024 b .

2. 1B (bytes, bytes) = 8 bits (see below).

3. 1KB (kilobytes, kilobytes) = 1024b = 2 10b.

4. 1MB (megabytes for short) = 1024 KB = 2 20 B.

5. 1GB (gigabyte, one billion bytes, also known as "gigabit") = 1024 MB = 2 30 B.

According to the standards of the International Electrotechnical Commission (IEC), the International System of Units (SI) stipulates 1kB = 103B, while IEC stipulates 1kB = 2 10B.

Extended data:

Data classification:

1, divided into:

(1) positioning, such as various coordinate data;

(2) Qualitative, such as data indicating the attributes of things (residential areas, rivers, roads, etc. );

(3) Quantitative data reflecting the quantitative characteristics of things, such as geometric quantities such as length, area and volume or physical quantities such as weight and speed;

(4) Timing data reflecting the time characteristics of things, such as year, month, day, hour, minute, second, etc.

2, according to the form is divided into:

(1) digital data, such as various statistics or measurement data. Digital data is a discrete value in a certain interval;

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

3, according to the way of recording is divided into:

Maps, tables, images, magnetic tapes, paper tapes. It is divided into vector data and grid data. In GIS, the selection, type, quantity, collection method, detail and reliability of data depend on the application objectives, functions, structures and requirements of data processing, management and analysis.

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