"Good performance in outer space and performing well on the planet."Sun Jiadong,general technical expert responsible China's rockets and satellites and academician of the Chinese academy of sciences,has repeatedly mentioned the development goals of China's satellite cause.
On December 17,during attending the"China commercial aerospace hyperspectral satellite data debut conference"hosted by Zhuhai Orbita Aerospace Technology Co.,Ltd.,relevant experts pointed out that compared with China's satellite platform and load research and development level,China's satellite data application capacity and level are seriously inadequate. Relevant experts call for better use of satellite big data to open up the era of quantitative remote sensing.
The era of"quantitative remote sensing"begins
Different objects have different spectral characteristics."hyperspectral satellite"realizes accurate identification of ground objects by identifying spectral differences between different objects.Its wide use will usher in a new era of"quantitative remote sensing".
China's"Zhuhai I"constellation,which was launched twice in 2017 and 2018,has four hyperspectral satellites and has become an important member of the global family of 25 hyperspectral satellites.
"Hyperspectral satellites can not only achieve the purpose of capturing surface planet information,but also obtain rich and refined spectral information,greatly improving the ability of image information acquisition within the region,which is of great significance for quantitative analysis of remote sensing information and more refined ground object identification.Yan Jun,the president of Orbita Co.told China Science Daily.
Currently,the"Zhuhai I"constellation is the only commercial hyperspectral satellite that has been launched and netted in China.Seven satellites operate normally in orbit and can cover the whole world every five days on average.The hyperspectral data obtained by the constellation are capable of precise quantitative analysis of vegetation,water bodies,oceans and other features.
Data needs to be used urgently
Miao Qianjun,deputy director general of the science and technology development department of the Ministry of Natural Resources,pointed out three levels of remote sensing technology in his speech at the debut meeting.Firstly,remote sensing images should be used to see the manifestation of the real existence of the objective world.Secondly,features and essence should be identified by technology."Finally,and most importantly,the goal--to identify problems,to use remote sensing to enhance insight,to help make information decisions,to achieve social value through technology."Miao stressed.
To achieve the goal of"discovery",the key is to make good use of satellite big data.
Liu Wenqing,an expert on environmental monitoring technology and an academician of the Chinese academy of engineering,pointed out at the meeting that China's satellite platforms are becoming increasingly mature and have reached the international leading level.Satellite loads,instruments and equipment are in the"follow-up"level."In terms of satellite load data processing,we are far behind the level of foreign countries,which is seriously insufficient compared with China's capability of developing satellite platforms and instruments."Liu stressed.
Experts stressed that satellite data must be combined with data from other industries to be of sufficient value."At present,there is not a lot of remote sensing data.What we lack is not big data,but mining and exploring of the value of these data."Xu Wen,a member of the international academy of astronautics and chairman of China Siwei Surveying and Mapping Technology Co.,Ltd.told China Science Daily.
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