随着科技的发展，20 世纪60 年代以来遥感技术由于观测范围大、获取信

With the development of science and technology, since the 1960s, remote sensing technology has been widely used in the monitoring of natural disasters due to its large observation range, large amount of information, fast speed, good real-time, and strong dynamics, mainly through remote sensing satellites. Real-time monitoring of the regional weather conditions, in order to predict its changing trend, and provide rainfall factor information for flood forecasting. In addition, the use of remote sensing images can accurately and quickly determine the catchment area of ​​the watershed, and through a comprehensive analysis of the underlying surface, infer the production and confluence of the study area. The use of remote sensing technology can provide basic information for flood forecasting and forecasting. Nowadays, science and technology continue to make qualitative leaps. The monitoring of natural disasters is not limited to satellites, but is more automated and intelligent. Ultrasonic level sensors can be said to be better than blue.

With the development of science and technology, remote sensing technology has been widely used in the monitoring of natural disasters since the 1960s because of its large observation range, large amount of information, high speed, good real-time and strong dynamics, mainly through remote sensing satellite to monitor the weather conditions in the region in real time, so as to speculate on its change trend and provide rainfall factor information for flood prediction. In addition, remote sensing images can be used to determine the catchment area of the basin accurately and quickly, and through the comprehensive analysis of the lower pad surface, the production and catchment of the study area can be inferred. The basic information of flood prediction and prediction can be provided by means of remote sensing technology. Now science and technology continue to make qualitative leaps, for natural disaster monitoring is not limited to satellites, but more tend to automate, intelligent, ultrasonic level sensors, can be said to be blue out of blue than blue.

With the development of science and technology, since the 1960s, remote sensing technology has been widely used in the monitoring of natural disasters due to the advantages of large observation range, large amount of information, fast speed, good real-time performance, strong dynamic and so on. It mainly uses remote sensing satellite to monitor the regional weather in real time, so as to speculate its change trend and provide rainfall factor information for flood prediction. In addition, the catchment area can be accurately and quickly determined by using remote sensing images, and the runoff and confluence of the study area can be inferred through the comprehensive analysis of the underlying surface. Using remote sensing technology can provide basic information of flood forecasting. Nowadays, science and technology have made a qualitative leap. The monitoring of natural disasters is not only limited to satellites, but also tends to be more automatic and intelligent. Ultrasonic liquid level sensor is superior to the blue.<br>