I want to know the concepts and characteristics of the following polar satellites. Please introduce it. Thanks in advance!

Polar orbiting satellites orbit the earth over the poles, during which they constantly photograph different areas of the earth. Generally, such satellites are hundreds of kilometers away from the ground, which is closer to the ground than geosynchronous satellites, so the resolution of the images taken is higher. For example, at the beginning of the CCTV weather forecast, a woman said it on a map taken by a polar satellite.

Function: It can collect the temperature, humidity and radiation data of the atmosphere and the earth's surface, and help scientists to obtain the information of El Ni? o phenomenon, drought and flood, so as to better carry out long-term weather forecast and environmental monitoring. In addition, satellites also carry radio signal relay devices, which can also be used to rescue ships, planes and so on.