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This article to share with you is about how to echarts GeoJSON file compression, Xiaobian think quite practical, so share to everyone to learn, I hope you can read this article after some gains, not much to say, follow Xiaobian to see it.

In order to speed up the transmission speed of GeoJSON, echarts compresses GeoJSON files, compresses coordinate information in GeoJSON, and reduces the amount of coordinate data.

JSON data format in Geoecharts:

The zigzag algorithm is used for compression."The principle of zigzag is to compress redundant data due to complement. Its principle is to move the sign bit to the right to the first bit, and divide the negative number by the last bit." "

Echarts has built-in decoding algorithm, which analyzes coordinate information and draws it on the map. Administrative divisions of China before compression:

Data after compression:

The compression ratio is quite high, which can speed up the transmission speed on the network transmission. Now the computer performance of the client is OK, and the analysis does not take a long time.

Key compression code (from echarts source code):

Key decompression code (from echarts):

When developing other types of maps, a large amount of coordinate information is involved, which can also be compressed in this way, and then the data is analyzed on the client and displayed on the map to achieve the purpose of reducing network data transmission.

The above is how to compress GeoJSON files of echarts. Xiaobian believes that some knowledge points may be seen or used in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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