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This article mainly introduces the use of Contour in GIS development, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to know about it.

Contour (contours) is a commonly used display method in gis development, which can segment and connect a group of points distributed on the map according to the numerical value, and display them into blocks of distributed areas. Contours are also generated in accordance with this principle.

Effect picture:

Two-dimensional contour uses the Marching squares algorithm, and codes in various languages can be found on github.

For an introduction to Marching squares algorithm, see Encyclopedia:

Https://en.wikipedia.org/wiki/Marching_squares

In meteorology software, temperature, humidity and other distribution maps can be displayed in this way. Meteorology software meteoinfo is displayed in this way. The software URL (http://meteothink.org/index.html) is also open source in github.

Data: in the map, virtual grid division, each grid point has the corresponding data, according to the location, time, type, can be downloaded to grib, netcdf have samples of this kind of data.

Development: do a good job of data segmentation, color setting, the algorithm can download a corresponding language directly from github, on the map, draw polygon, or make the output into a picture, according to the four to the range of affixed to the map, in some commonly used map class library, you can also directly use API to call.

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