Modern Express From the past that it was able to locate relatively wide highways to now accurately locate the location of rural roads, my country has made major breakthroughs in satellite mapping in recent years. "Satellite surveying and mapping is a long-term mission that requires generations of people to continue to strive." Sun Chengzhi, a researcher at the School of Remote Sensing and Surveying Engineering of Nanjing University of Information Technology, has also been more determined after teaching for a year and has cultivated more outstanding talents for aerospace surveying and mapping technology.
△ Sun Chengzhi
From the commander-in-chief of the satellite application system to the university professor, he is determined to promote the satellite surveying and mapping industry to keep moving forward
On July 25, 2020, my country's Resource 3 03 satellite was launched and operated in network with the Resource 3 01 and 02 satellite and other in orbit, providing data support for new basic surveying and mapping, and taking into account the application needs of multiple fields such as ecological environment monitoring, disaster prevention, mitigation and relief.
△ Sun Chengzhi was at the operation site
As the commander-in-chief of the engineering of my country's Resource 3 satellite application system and the deputy commander-in-chief of the "National High Resolution Earth Observation System" major scientific research project (civilian part) project, Sun Chengzhi finally breathed a sigh of relief. "The construction mission of the Resource 3 satellite project has been completed, my country's remote sensing observation capabilities to the ground will be significantly improved, and I have more time to do other work."
2021, Sun Chengzhi changed his identity. He came to . of Nanjing University of Information Engineering and became a leading talent in the discipline of remote sensing and surveying and mapping, and a researcher at the School of Remote Sensing and Surveying and Mapping.
Sun Chengzhi said that the importance of satellite surveying and mapping is to let everyone not only see today, but also tomorrow. "To join Nanxin University , in addition to using many years of industry experience to promote the integration and development of school scientific research resources and civil remote sensing, more importantly, cultivate more relevant talents and promote the satellite surveying and mapping industry to continue to move forward."
assisted the launch of Resource 3, filling the gap in my country's independent civilian stereoscopic surveying and mapping satellite
On January 9, 2012, the Resource 3 01 satellite was successfully launched. my country has the first civilian high-resolution optical stereoscopic surveying and mapping satellite, filling the gap in autonomous civilian stereoscopic surveying and mapping satellite.
This satellite has achieved a fundamental change in my country's 1:50,000 map measurements from relying on foreign satellites to using domestic satellites, making China one of the few countries in the world that master complete satellite surveying and mapping technology.
On July 25, 2020, the Resource 3 03 satellite was successfully launched, and together with the Resource 3 01 and 02 satellites currently in orbit, they formed my country's three-dimensional surveying and mapping satellite constellations, further enhancing China's ability to independently obtain space geographical information and improving China's surveying and mapping service guarantee level.
" The ‘Resource 3’ series of satellites has changed the way my country’s surveying and mapping relies on aerial photography." Sun Chengzhi said that the core point is inseparable from the three-line array three-dimensional shooting developed by the team.
The so-called three-dimensional shooting is that three -line array cameras are arranged in front, front and rearview (one is facing forward, one is facing down, and one is facing back). In this way, each position where the satellite flies along an orbit, there are three cameras to track and shoot three positions, simulating the human eye to see. After the combination of front, front and rearview, multiple three-dimensional images can be formed.
Since the surveying and mapping camera has been upgraded from the aircraft platform to the satellite platform, the surveying and mapping bandwidth has been increased from the original kilometer level to 50 kilometers, and the surveying and mapping efficiency has also been greatly improved.
" In the past, aerial mapping was adopted, and the total imaging capacity of the whole country was between 700,000 and 1 million square kilometers. Through surveying and mapping satellites, without considering clouds, the global surveying and mapping can be mapped in 59 days, and the accuracy is also very high." Sun Chengzhi said that now the three satellites of Resource 3 have realized the Samsung network operation, and the revisit period is also shortened to 1 day, and the 2-meter resolution optical stereoscopic images and planar images have greatly improved the annual, quarterly and monthly coverage capabilities of the country or key areas.
creates a "camera" flying in the universe, aiming at the earth to slap out "3D blockbusters"
satellites into the sky, the focus is on application.Using remote sensing images, monitor the construction progress of Wuhan Huoshenshan Hospital and Leishenshan Hospital ; as the flood season approaches, the lake area has no blind spots to track and shoot all-weather and provide real-time data... The wide application of high-resolution series satellites makes these scenes observable and measurable.
As the deputy commander-in-chief of high-score special project, Sun Chengzhi has been committed to developing my country's high-resolution ground observation system. "I have participated in many tasks, especially the development of the Gaofen 7 satellite , which is still vivid in my mind." The full name of the Gaofen 7 satellite, the high-resolution land surveying and mapping satellite, was successfully launched on November 3, 2020. How clear is the high resolution of
? Sun Chengzhi explained that the Gaofen 7 satellite can reach 1:10,000 scale , and its plane positioning accuracy is better than 7 meters and its elevation accuracy is better than 1.5 meters. "The Gaofen 7 satellite can more accurately locate the location of the land and identify more details. For example, in the past, we could only locate relatively wide highways, but now we can accurately locate the location of the country road." How can such a high resolution be achieved? Sun Chengzhi said: "This is thanks to the photography and mapping 'artifact' configured on it. It is equipped with payloads such as the dual-line array stereo camera , laser altimeter, etc., breaking through the sub-meter-level stereo mapping camera technology." After multiple rounds of scientific and technological research, the team merged the two technologies into a satellite, so that high-spatial resolution optical stereo observation data and high-precision laser altitude measurement data can be obtained.
" Not only that, the images drawn by the Gaofen 7 satellite are three-dimensional. On the map measured with it, the buildings are no longer just squares, but three-dimensional models." Sun Chengzhi said.
serves the society and cultivates the power of aerospace remote sensing in the new era
" Like a spring breeze, this is my most direct feeling in interaction with Teacher Sun." Zhao Guanghui, a master's degree in resource and environment at the School of Remote Sensing and Surveying Engineering, became Sun Chengzhi's first master's degree student in September 2021 after entering the school. "Teacher Sun pays great attention to the cultivation of learning ability. Although it is not long, Teacher Sun's deep knowledge reserves and excellent scientific research and academic ability have made great progress in my theory and practice. "
" Being a tutor basically means spending time with students day and night, and I am also very happy to see them make progress." This year, Sun Chengzhi brought 5 master's students and 1 doctoral student. Speaking of his expectations for students, he said, "I hope my students can understand the importance of rigorous, serious and perfection in scientific research. At the same time, everyone should cherish the time to learn new knowledge and skills at school. "
" In the future, my country's aerospace surveying and mapping technology will usher in a golden period of development, and it requires a lot of talent resources." Sun Chengzhi said that when returning to the campus to stand on the podium, everything is for the growth of the new generation. "In recent years, I have a lot of yearning for the profession of teacher. Joining Nanxin University is a dream come true."
At present, surveying and mapping technology and the new generation of information technology represented by mobile Internet, big data, and cloud computing are accelerating the integration, and have spawned various geographic information new applications, new products and new services. "The commercial aerospace field requires the participation of many universities, research institutions and researchers." Sun Chengzhi said that he hopes to transform the educational advantages of universities into talent advantages of aerospace surveying and mapping, and at the same time, achieve seamless connection between enterprises and scientific research institutions, and directly transform original technology into market products.
Correspondent Yan Changkun Bai Xue Zhou Hongyi Modern Express + Reporter Li Nan
(Photo provided by the interviewee)
