What is remote sensing? What can remote sensing do?

Broadly speaking, remote sensing refers to collecting some or some specific information of an object without direct contact, so as to understand the nature of the object. Generally speaking, it refers to the technology of observing the ground from satellites or planes and collecting and analyzing the information of targets by using electromagnetic emission and receiving technology.

Simple understanding is like installing a powerful camera on an airplane or a satellite, and obtaining the desired data through image analysis.

What can remote sensing do?

1, observe PM2.5

Take the smog control work that is currently the most concerned. Since 20 1 365438+1October1,PM2.5 monitoring has been carried out in more than 70 cities in China. At the same time, satellite remote sensing technology has been used to monitor the influence range of haze from the air.

2, for disaster prevention and mitigation.

Remote sensing satellites can be used for emergency monitoring of various disasters and information support for emergency rescue and disaster relief, such as earthquakes, volcanic activities, soil and dust disasters. On August 3, 20 14, after the Ludian earthquake in Yunnan province, the state mobilized domestic and foreign 18 remote sensing satellites to image the earthquake-stricken area urgently, and obtained nearly 100 scenes of satellite image data in Ludian earthquake area, which played a great role in earthquake relief.

3. Resource survey.

Satellite remote sensing technology can be used to survey the earth's resources, such as water, oil, natural gas, coal and metal mineral reserves. In August this year, China successfully sent Remote Sensing Satellite 20 into space at Jiuquan Satellite Launch Center. It is mainly used for scientific experiments, land and resources investigation, crop yield estimation and disaster prevention and reduction.

4. Weather forecast, mastering sea surface temperature and ocean information.

If there is no meteorological satellite, we can't comprehensively monitor the atmospheric composition and make a good weather forecast; If there were no ocean satellites, it would be difficult for us to solve problems such as red tides. Without land remote sensing satellites, we can't effectively monitor the changes of forests and deserts.

5. Archaeological research.

Remote sensing technology has been applied more and more in archaeological work in China. In the archaeological work of many ancient sites, such as Beiting Ancient City and Gaochang Ancient City in Xinjiang, Chang 'an City in Shaanxi, Luoyang Ancient City in Henan and Yinxu in Anyang, the image data obtained by remote sensing technology has provided a lot of useful help for scholars to discover the phenomenon of sites, find out the scope and connotation of sites, and understand the preservation status of sites in past lives.

6. Crop yield forecast.

Satellite remote sensing technology can grasp the global distribution of cultivated land, monitor the growth of bulk crops and estimate the yield. The application of remote sensing technology has greatly changed the way of obtaining agricultural statistical data. Using remote sensing technology, the grain planting area of a region can be clearly seen on satellite photos, which greatly improves the accuracy of the data.

7. Military.

The application of remote sensing in military science is obvious, because the target can be observed from a distance and relatively macro analysis data can be obtained. Militarily, remote sensing can monitor the resource status of target countries and regions. Monitor each other's military deployment and large-scale military operations. In specific operations, remote sensing can help to analyze the local terrain and resources, thus helping to judge their own tactical action plans.