How often do you take aerial photos in Xiamen?

Satellite aerial photography is once every six months and twice a year, in June and 65438+February respectively.

Man-made satellite. An unmanned spacecraft orbiting the earth in space. Satellites basically orbit the earth according to the laws of celestial mechanics, but the actual motion is very complicated due to the influence of the gravitational field, atmospheric drag, solar gravity, lunar gravity and light pressure of aspheric earth with different orbits. Man-made satellite is the spacecraft with the largest number of launches, the widest use and the fastest development. Satellite launches account for more than 90% of the total number of spacecraft launches. Satellites can be divided into three categories. Scientific satellites, technical test satellites and application satellites. Scientific satellites are satellites used for scientific exploration and research, mainly including space physics exploration satellites and astronomical satellites. They are used to study the atmosphere, radiation belt, magnetosphere, cosmic rays and solar radiation of a planet, and also to observe other planets. Most artificial satellites in the world are artificial earth satellites, and there are also artificial Mars satellites.