For example, GIS can quickly draw a rainfall line that reflects rainfall.
Such a map is called a rainfall map. The characteristics of the whole surface can be estimated by measuring a limited number of points, which is very mature. In GIS, two-dimensional rainfall map can be superimposed and analyzed with other layers in the same area. If all factories near the wetland discharge chemicals into the river at the same time, how long will it take for the amount of pollutants discharged into the wetland to reach the amount that damages the environment? GIS can simulate the diffusion path of pollutants along linear networks (rivers). Numerical values such as slope, speed limit and pipe diameter can be incorporated into the model to make the simulation more accurate. Network modeling is usually used in traffic planning, hydrological modeling and underground pipe network modeling.