In this paper, with Landsat image, the present states of the lake-shrinking on the Tibet plateau are analysed. And the imagery features about the lake-shrinking are estabilished. The lakes are divided into four main types according to their present states. It has proposed that shrinkage of the lakes in the northern Tibet is very serious. Adry climate is the main factor causing the lake-shrinking.
According to the interpretation and the analysis of the remote sensing image, combined with computer processing. geophysical and geochemical information as well as field verification, the structural framework in this area is considered as follows: the granite body of palaeozoic and Mesozoic Era distributes extensively in the North of the area. There is a Archeozoic Eon metamorphic dome (Huiquanzhan dome) in the South. The tectonic belt lying between the North and the South of the area strikes in NWdirection. It is the curve ductile shear zone (gold mineralization belt) in Banmiaozi to Xingantuen area, and it is related very closely with Huiquanzhan dome in the formation and the evolution. It is considered as structure of passageways for ore fluids, and the structure derived from it is regarded as the structure for ore housing.
Jiangsu Province has a very long coast line which has undergone a huge change of heavy mud sedimentation and erosion. The mordern coast zone are usually influenced and destroyed by erosion-collapse, coast silt-up and littoral mud-sand flow. The port construction、 shipping transportation and reclaim land from costal zone are sometimes endangered, which is the characterized geological disaster in Jiangsu Province. Through multi-temporal dynamic analysis based on arerial photographs taken respectively in 1950s, 1960s and 1980s with the scale of 1:20,000 and 1: 38,000, the erosion and sedimentation types of coast zone of Jiangsu province have been determined and classified. The most silt-mud plainshore are heavily erosed and silted up except a few stable bedrock indented coast and sandy coast. The erosed coast is about 230 km long with the erosion rate of several to several ten mpa and Puddly coast is more than 320 km long with the siltation rate of several ten to 200 mpa. among 619.1 km long coast line of the whole province. The main form of geological disaster in coast zone is the landloss for bank collapse by erosion, the other form is passage deviation in front of river mouth, port silt-up,and the form of waterway on barrier etc., which result from the transportation of sediments of littoral mud-sand flow. The main factors influencing upon geological disaster in Jiangsu coast area are tidal runoff, geological structure, oceanery hydrology, climate and man-made activities. The northward return of the Yellow river in 1855 is the dominant factor to cause the large scale rearrangement of erosion and sedimentation and to be the fundament of ongoing leveling. That is to say the projecting part of fossil Yellow river delta was erosed and the littoral flow carried sand to the two sides, resulting in large scale silt-up shore. The results of rearrangement is that the Jiangsu coast line will be straightened in several decades.
The analysis of remote sensing data show that the salinized soil is estricted by the semiarid climate. the topography trap. the groundwater of shallow layer and so on. The lateral seepage of yellow river has been offering a plentiful groundwater and salt for this area. The surficial and hiding fossil river course as well as the flood fans bring up very complicated microrelief and the hydrogeological features, and cause the degree and the type of the salinization. The factors of macroscopic geologic environment can be changed hardly in this area, but the microscopic geologic environment for the salinization can be transformed to restrain the salinity level. The main target to harness the salinized soil is to control the hydrosaline regime, and adopt measures continualy to desalt the groundwater, So that the salty density of the soil is transfered from the crystal phrase of the salt solution to low density. It is unpractical that the salinized soil can be made a radical cure by one time control work.
The Menyuan area of the Qinghai Province lies to the northern foot of the Qilian Mountain, three times of earthquake took place from August through September of 1986, the strongest of which is magnitude 6.4 (on the Richter scale). Remote sensing technology played an important role in the investigation of geological background and damage caused by earthquake. By the interpretation of satellite images and aerophotos produced before and after the earthquake, it is found that Menyuan earthquake is on the connected zone between Qilian Mountain and the Hexi Corridor. The well-developed fault structures, distributed mainly in the northwest direction, control the formation of intermontane basins and valley basins, and are very active in the period of new structure movement, such as the Quaternary strata are fractured; the geomorphological difference is clear; the drainage system and ridges are deformed; the proluvial fans are folded and displaced. Remote sensing images show the earthquake bulges and earth crevices clearly. Analysing these images and combining with geological and earthquake information, it is found that a new structure activity is strong in this area, especially the fault activities at the northern foot of Qilian Mountain. Some major earthquakes such as Haiyuan, Gulang and Changna took place in the past on this active zone, and there were more minor earthquakes also It is Considered that the northwest fault at the northern foot of Qilian Mountain is an earthquake source and has close relation with Menyuan earthquake. On the middle and east part of this fault, some strong and moderate earthquake will take place in the future.
In this paper, the methods are discussed to define tile death-fire and fire region caused by the coal spontaneous combustion in the North of China. According to the theory of reflectance spectra of burnt rocks, the death fire area is defined by means of the interpretation of the aerial photographs. On the basis of the law of heat radiation, The border of the fire region is defired by means of the infrared scanning images, and the small regions by the means of the infrared measuring technology on the ground. And obvious economic profits have been acquired.
Liujiang basin is an important water source area of Qinhuangdao city. The surface collapse will happen at hidden karst areas, due to much exploiting of ground-water. The characteristics of hidden fault structure, distribution and water-bearing nature of Quaternary loose sediment, and distribution of surficial and hidden karst area are studied by means of multi-temporal and multispectral satellite images and aerial color photos and digital image processing technique, combining with comprehensive analysis of the data from ground truth investigation, geophysical prospecting and drilling. Accordillg to analysis of tile various geological factors which can cause surface collapse, the positions of dangerous areas of surface collapse caused by exploiting of grouod -water have been predicted.The reliable geological evidences also have been provided for preventing work.
This paper presents the new series of airborne scanner and related systems which were developed in the last 5 years. The spectral resolution of the sensors has become higher and the installation of band is more complete and has formed series. The on board electronic devices have made progress on multiple, high speed, large content, automatic operation and flexible function. The ground pre-process facility provides fast reproduction, information transfer, process service and standard products. Afair technical system with complete units from getting data to standard products in multispectral remote sensing has been formed. Some recent applications are also introduced here.
