What is a rocker?

First of all, it is not the joystick that is used on the mobile phone, but the remote sensing.

Remote Sensing (English name is Remote Sensing, abbreviated as RS) uses remote sensors to detect the properties of ground objects from the air. It recognizes all kinds of objects on the ground according to the principle that different objects react differently to the spectrum, that is, things that are perceived far away. That is to say, the remote sensors of flying objects such as airplanes, spaceships and satellites are used to collect ground data, get information from them, and identify surface objects through recording, transmission, analysis and interpretation.

Remote sensing is a new technology developed on the basis of aerial photography, which was developed in the early 1960s. It started with aerial remote sensing. Since 1972, the United States launched the first land satellite, marking the beginning of the era of space remote sensing. After decades of development, remote sensing technology has been widely used in the fields of resources and environment, hydrology, meteorology, geological science and geography, and has become a practical and advanced space exploration technology. In the next decade, it is expected that remote sensing technology will enter a new stage of providing a variety of earth observation data quickly and timely, and its application fields will be more and more extensive with the development of space technology, especially the development and mutual penetration of geographic information system and global positioning system technology.