Through more than twenty years' development, an integrated research system of remote sensing application has come into being, which is composed of spaceflight, aerial survey, ground detection and combination with GIS. Remote sensing in western China is an important technology for the investigation and monitoring of resources, environments and hazards. In this paper, the authors first reviewed the experimental research of remote sensing technique in western China, then systemically summarized the current situation of remote sensing application in western China and briefly enumerated parts of results. Combined with the requirements of Western Development, the paper also discussed the future development strategy of remote sensing in western China.
Advantages and application fields of the remote sensing technology in environment and resources are described, and recent progress of the application both in home and abroad is also analyzed. At last, the prospects of remote sensing technology in environmental protection are discussed in this paper.
Using GMS-5 infrared, visible and vapor multi-channel remote sensing data of high space-time resolution as well as general meteorological data, this paper has formulated the satellite remote sensing image models for monitoring summer rainstorm of Shandong. The methods for using meteorological satellite data to detect rainstorm disaster are studied.
The origin and the source region of the dust weather are analysed in this paper, and some conclusions have been drawn: the climate background for the formation of the dust storm included the drought which had continued for three years and the abnormal warm during the winter of 2001. The dust weather that affected Beijing came from Mongolia and Hunshandake sandy area located in the middle of Inner Mongolia, and the former area obviously exerted more intense influence than the latter area.
There has been a long history of exploiting gold mines in Sanjiang region of Tibet, and 40 gold mines have already been found. Nevertheless, these deposits are almost all associated mines, and only very few gold deposits are of independent type and their sizes are very small. The analysis of regional geological background and mineralization conditions shows that the area must have great gold potential. Using the five elements of remote sensing, the authors analyzed characteristics of satellite photographs of ore-bearing porphyry bodies, brittle-tough shear zones, shattered-altered envelopes and their tonal anomaly, thus delineating the perspective area of gold deposits.
Human beings should get along well with the nature and must not violate the natural regularities. Based on studying satellite images of the sea dam of various times in Lianyungang, the authors consider that, while contributing to the local economic development, the dam totally changed the hydrological and geological environments of the harbor. It changed the sea currents near the shore, the transporting paths of the silts, and the erosions of the harbor, which caused the deterioration of the hydrological and geological environments. As a remedy, the authors put forward some proposals for solving these problems.
This is the first paper in the serial articles on the new parameter for the prediction of the mineral resources-alteration RS anomalies. The geological basis and the spectral presupposition for the alteration anomalies are discussed. The result of extracting alteration anomalies in an area of more than 20 000 square kilometers within East Tianshan Mountains and the result of the in-situ investigation of some anomalies are reported. Among the 71 known deposits or mineralization spots in this area, 61 have the corresponding alteration anomalies. The coincidence coefficient is as high as 85.9%. Some new related terms are defined.
TM data are major remote sensing data now and can completely meet the precision for the identification of the active tectonic zones in Tibet. Tibet has special geographical and environmental background, and possesses a complete set and wide distribution of active tectonic zones. As conditions are extremely bad, people can hardly approach there. Applying the remote sensing technology and the high-precision TM image, we can achieve the purpose of simple imaging, high resolution, wide projection and low cost. Thus, the rapid and accurate identification of all kinds of active tectonic zones can be realized. The method has overcome such shortcomings of the traditional surveying methods as long periodicity, high cost and impossibility of making insite investigation at many places.
In order to enhance the linear image, the authors conducted directional filtering of the TM image and digital elevation model (DEM), and then used false color composite technique to produce a base map. Through interpretation of the base map and field verification, the distribution of fractures in Qingyuan County was mapped. The spatial correlation between fractures and mountain hazards was also investigated. The results show that if a region is affected intensely by deep faults, the positive correlation between mountain hazards and intersection density of fractures or density of fractures are existent but not notable. By contrast, the porphyritic distribution of mountain hazards caused by volcano-tectonic activity is quite obvious.
This paper discusses a spatial-temporal data model applied to land subdivision. Time as a basic feature of geographic entity and the method for studying geographic time in GIS have been described. Some basic ideas for designing a spatial-temporal data model have been presented in the light of storage management and spatial-temporal semantics.
Combined with the latest IT development, this paper deals mainly with the concept and the key technology of Digital City. The initial strategy for realizing Digital City in China has also been analyzed.