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Digital Image Processing
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China Remote Sensing satellite ground station and its research and development
Pilot application study
Based on information analysis and signature study of TM data, certain pilot application projects have been carried out to promote TM data application.
- TM Information and signature study (4)
Nine test sites with different ground objects and distributed from North to South of China were selected and their TM spectral information correlation and principal component studies were conducted. It is found that TM information is 3-D or 4-D in dimension and, in general, TM5 has widest information range and TM3, 4 and 5 band combination is most informative of all band combinations.
- 2:50,000 scale TM image generation
By combined digital zooming and photo enlarging, 1:50,000 scale image map is generated to meet thematic mapping requirement. Its usefulness was proved in the land use mapping conducted in Nanpie county, Hebei. This TM product has also been used in 1:50,000 geological mapping in North-East of China and is adopted for land use inventory in North-West of China, where no appropriate map information exists.
- Change detection from satellite data (5)
Change vectors of different temporal images in intensity index/vegetation index plane reflect change information on different ground objects. This method has been proven in many cases of land use change study.
- Computerized multilayer classification study (6)
Based on experiences in visual interpretation, a computerized multilayer classification method bas been developed using multilayer analytical deduction. The introduction of intelligence model greatly increases the accuracy of classification.
- Microprocessor based image analysis software
During pilot application study., a set of software packages based on information analysis, signature extraction (including change detection) and computerized classification has been developed. It has certain degree of intelligence and provides a friendly condition for direct thematic mapping.
Natural disaster monitoring
The station participated actively in the monitoring of the huge forest fire in Da Xin An Lin, North-East of China, evaluation of losses and studies of eco-environmental changes after the fire, (7) and also in the flood prevention and loss minimizing activities for the Yangtsu River, Yellow River and YongDing River in the past three years. These were highly praised and awarded by the Chinese Government. Monitoring of the off shore red storms, insect pests of the pine forest in the South and severe snow storm in Tibetin, last year were also carried out successfully.
References
- Wang Xinmin and Zhang Lei, Analysis of geometric fidelity of systematically corrected landsat-5 TM Image Data, "Remote Sensing of Environment," Vol. 4, No4, 1989.
- Wang Xinmin et al., Fast Precision Correction and large area Mosaicking of TM imageries, "Remote Sensing of Environment", Vol. 5 No. 3, 1990.
- Ban Yifang et al., The Key Techniques of Making 1:50,000 TM Image, " Remote Sensing of Environment", Vol . 4 No. 4, 1989.
- Dai Changda et al., The information Charactristics of TM Data and the Optical Band Combination, "Remote Sensing of Environment", Vol. 4 No. 4, 1989.
- Wang Jieshen et al., Monitoring of Land Use Change by Satellite Remote Sensing, "Remote Sensing of Environment," Vol.4, No. 4, 1989.
- Hu Deyong et al., Computer Composed Mulit-level Classification Method in land Use investigation, "Remote Sensing of Environment," Vol. 4, No.4, 1989.
- Wang Xinmin et al., landsat monitoring of Chinese DA XIN ANLING Forest Fire Region. J. Chinese Soceity of Astronauties, No. 1, 1990.
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