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Mapping From Space
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The airborne Remote Sensing technical system
of the Chinese Academy of Sciences
- Real -time Data Transmission Subsystem
This system consists of the on - board modulation and transmission system and field receiving, demodulation, display and processing system. The transmission distance can reach over 200 km. Over the recent years, the experiments of transmission of the flood and forest fire information in various places over the country have been carried out. Simultaneously with the transmission of images, also the geographical position (latitude and longitude), the altitude of platform and the time signal cab be transmitted to ground.
- Pre-processing and Processing System for Airborne Imagery
This system has been designed and developed specially for processing the airborne multispectral Images. The main computer of this system is Micro VAXII. It has fast payback and pre-processing capabilities, also it has the general image processing capabilities such as radiometric and geometric correction, image enhancement and classification. The output production of this system is the standard CCT tapes, discs and photographs in format of standard original images , pre-processed images and precision processed images.
Fig 3. The View of Remote Sensing Aircraft of CAS
The pilot studies of system application
The airborne remote sensing system has great application capabilities. During the system development, a series of pilot application projects have been carried out, the capabilities of system have been examined and the application techniques and methods also have been developed.
- The Land Cover Studies
During the past few years a number of projects connected with the land resources have been carried out in some regions of Heilongjiang province, Xinjiang, the Loess plateau, the North-China Plain, Tianjin, Hainan Island and other regions. According to the results of study in north part of Heibei province, the super small scale aerial photos of hight altitude color infrared photography (<1/100,000) can be enlarged 25 times for the land cover investigation.
It is very efficient and economical
- Flood Monitoring
The SAR system was flown above the large rivers area of China during the flood season. The flood monitoring was made in parts of the Valley of Yongdin river, Yellow river and , Yangze river. In each monitoring flight the area can be covered as large as tens of thousands km2. The monitoring experiment has proved that monitoring the flood by using active microwave system has excellent effect, the flood boundary has been shown very clearly. The advantage of such system is outstanding especially in cloudy and raining conditions.
- Monitoring the Forest Fire
The system can not only be used for monitoring the forest and grassland fires, but also can determine the location of fire disaster. Experiments show that in case of flight altitude at 10,000m, the ground fire spots smaller than a few square meters can be detected, the detectable area can cover over 10,000km2/h.
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