What is remote sensing? What can remote sensing do?
Broadly speaking, remote sensing refers to collecting some or some specific information about a certain 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 artificial satellites or aircraft, and using electromagnetic transmission and reception technology to collect target information and analyze it.
To simply understand, it is like installing a powerful camera on an airplane or satellite to obtain the desired data through image analysis.
Things that remote sensing can do:
1. Observe PM2.5.
Take the smog control work that has attracted the most attention at present. Since January 1, 2013, my country has carried out PM2.5 monitoring in more than 70 cities, and at the same time used satellite remote sensing technology to Monitor the haze's impact from the air.
2. Used for disaster prevention and reduction.
Remote sensing satellites can be used for emergency monitoring of various disasters and information support for rescue and disaster relief, such as earthquakes, volcanic activities, soil and sand disasters, etc. After an earthquake occurred in Ludian, Yunnan on August 3, 2014, the state government mobilized 18 remote sensing satellites at home and abroad to conduct emergency imaging of the earthquake-stricken area. It obtained satellite image data of nearly 100 scenes in the Ludian earthquake area, which played a huge role in earthquake relief. effect.
3. Resource census.
Satellite remote sensing technology can be used to survey earth resources, such as water, oil, natural gas, coal, and metal mineral reserves. In August this year, my country successfully launched the remote sensing satellite No. 20 into space at the Jiuquan Satellite Launch Center. It is mainly used in scientific experiments, land and resources census, crop yield estimation and disaster prevention and mitigation.
4., Weather forecast, grasp sea surface temperature, ocean information.
Without meteorological satellites, we cannot comprehensively monitor atmospheric composition and make good weather forecasts; without ocean satellites, it is difficult for us to solve problems such as red tides; without land remote sensing satellites, we cannot effectively monitor Changes in forests, deserts, etc.
5. Archaeological research.
Remote sensing technology is increasingly used in archaeological work in my country. In the archaeological work of many ancient sites such as Beiting Ancient City and Gaochang Ancient City in Xinjiang, Han Chang'an City in Shaanxi, Luoyang Ancient City of Han and Wei Dynasties in Henan, and Yin Ruins in Anyang, image data obtained by remote sensing technology have helped scholars discover relic phenomena and explore It has provided a lot of useful help in clarifying the scope and connotation of the ruins and understanding the past and current preservation status of the ruins.
6. Crop production forecast.
Satellite remote sensing technology can grasp the distribution of global cultivated land, monitor the growth of bulk crops, and estimate yields. The application of remote sensing technology has brought about major changes in the way to obtain agricultural statistical data. With 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 targets can be observed at long distances and relatively macroscopic analysis data can be obtained. In the military, remote sensing can monitor the resource status of target countries and regions. Monitor the other party's military deployment and large-scale military movements. In specific operations, remote sensing can help analyze local terrain and resource conditions, thereby helping one's own tactical action plans to be judged.