What is remote sensing? What's the use?

Remote sensing refers to non-contact and long-distance detection technology. Generally, it refers to the detection of electromagnetic radiation and reflection characteristics of objects by sensors/remote sensors. It is an instrument sensitive to electromagnetic waves, such as a remote sensor, which detects the target object without touching it.

It is a science and technology that can be used to obtain reflected, radiated or scattered electromagnetic wave information (such as electric field, magnetic field, electromagnetic wave, seismic wave, etc.). ) and extraction, judgment, processing, analysis and application.

Based on aerial photography technology, it is a new technology developed in the early 1960s. Started for aerial remote sensing, since 1972, the United States launched the first land satellite, marking the beginning of the era of space remote sensing.

Extended data

Remote sensing is a new technology that combines the remote sensing of the earth's surface with the monitoring of resource management (such as the management of trees, grasslands, soil, water, minerals, crops, fish and wildlife) through remote sensing instruments on artificial earth satellites, aviation and other platforms.

Remote sensing detection can observe the earth in a large area from the air or even space in a short time and obtain valuable remote sensing data from it.

The speed of obtaining information is fast and the period is short. Because the satellite orbits the earth, it can get the latest information of various natural phenomena passing through the region in time, so as to update the original information or carry out dynamic monitoring according to the changes of old and new information, which is incomparable to manual field measurement and aerial photogrammetry.

Baidu Encyclopedia-Remote Sensing