On the basis of 1∶1000000 remote sensing interpretation and local comprehensive interpretation, it is thought that the northeast part of Deerbugan deep fault might branch into two diverging faults near Alongshan of Inner Mongolia. These two diverging faults have identical characteristics, and extend to Russia in NEand NNE-NE direction respectively. They are linked at an acute angle with the south and middle part of Deerbugan fault near Alongshan, forming a prominent Y-type faulted structure framework.
On the basis of Landsat MSSof 1970s and ETMimage of 1990s and by means of analysis and comparison as well as field inspection, the authors rapidly extracted the distributive information of four levels of soil desertification along the peripheral areas of Tarim basin. According to the available distributive information of four levels of soil deterioration in two periods, a map showing the gradual change of the extent and limits of soil desertification in the whole region was compiled, which objectively reflects the land deterioration in the past 30a and provides a remote sensing application example for the study of land deterioration in arid and semi-arid areas.
With the Fengjie-Badong section of the Three Gorges reservoir area of the Yangtze River as the study area, the authors, using the remote sensing technique, accurately delineated bodies of collapse, landslide and mud-rock flow. The results gained have laid the foundation for the objective reflection of the harmfulness of geological hazards to the migration engineering and the further work in the whole reservoir area.
The Bangong Co-Nujiang River Plate Juncture in Tibet has complicated geological structure and favorable metallogenic conditions, and serves as a large potential ore-forming belt of precious metal resources. However, due to very insufficient geological exploration work and low level of metallogenic regularity study, no valuable primary gold deposits have yet been found. Based on a study of placer and primary gold ore spots, geochemical anomalies and placer mineral anomalies in the belt, in combination with an analysis of the ore-control factors, the authors advanced two remote sensing prospecting models for primary gold ore deposits, whose verification led to the discovery of a gold area with great reserves. The alteration rock type and the Mulongtao type recognized by the authors are two most important types of primary gold ore deposits in the belt, which show great potentials in the prospecting for gold deposits.
Land salinization is a dynamic phenomenon or process. With the annual and seasonal variation of the groundwater table, the nature, extension, magnitude and spatial distribution of the saline land are changing from time to time. The grasp of the up-to-date and reliable information on the saline land is a prerequisite for land reclamation and regional sustainable development. For the purpose of providing a generalized view of a fairly large area, remote sensing is widely used in saline land survey and dynamic study. Three groups of Landsat data were selected for the study of saline land dynamics during the past 15 years in the Yellow River Delta. Based on repeated field survey and soil sample analysis, an integrated classification method was developed for the extraction of information about saline lands. The study shows that, from 1987 to 2000, the trend of land salinization was rapidly accelerated; light saline land greatly increased; strong saline land gradually decreased; barren saline land increased from 1987 to 1996 and then decreased. The spatial structure of saline land distribution in such 6 types of landforms as terrace uplands, present flood plain, abandoned river courses, embanked former back swamps, isolated depressions and salt marshes & tidal flats in2000 was almost the same as that in1987.
Based on an analysis of the relevant TMpseudo-color synthetic remote sensing images, the authors interpreted the tectonic phenomena in western Yunnan Province, especially in Tengchong area. Through extracting the information concealed in the TM6 Far Infrared band and then by using the overlapping analysis of the tectonic interpretation and the terrestrial heat anomaly distribution images, the authors found out the regularity governing the distribution of the terrestrial heat spots and put forward the RStectonic image model. On such a basin, an Order-Ianomalous area which consist of 62 water-heat anomalous spots has been delineated.
Using TMimagery as remote sensing information source to analyze the coverage of vegetation and employing digital contour as data information source to extract the slope in combination with atmosphere and soil data, one can accomplish the investigation of soil erosion through GISspatial analysis.
Zhaoyuan City, located in the northwest of Jiaodong peninsula, is one of the economically developed areas in Shandong Province, with gold production making up the most important industry. The exploitation of gold, however, has severely affected the environment, and this problem should be tackled in a comprehensive way. This study is based on RSand field investigation data of the area. The new technology of Remote Sensing (RS) and Geography Information System (GIS) are applied to Geometric Correction of the Image, Image Interpreter of environment information and the construction of the database. This research can provide accurate and detailed data for restoring the natural environment of this area.
This paper deals with the application of the image data of TM7, TM5, TM3 Bands from Landsat-5 to the comprehensive analysis of the distribution and formation conditions of karst stone desertization in Guangxi. In view of the serious karst stone desertization developed in Pingguo and Dahua Counties, the authors used different TMimages in different periods to make comparison, thus finding out the causes responsible for the withering of karst stone desertization. Based on summarizing the regulation of stone desertization, the paper also discusses the division of the intensity of stone desertization.
Component GIS (ComGIS), a new technology based on COM(Component Object Model),is currently a main means in GIStechnology. Recently, this technology has developed so fast that more and more ComGISsoftwares are available in the market. This paper gives a detailed review of ESRI's MapObjects. MapObjects is flexible and open, but can not be symbolized. This paper deals with the technique for symbolization by using Visual C++ and the ComGISsoftware. It is believed that ComGISwill grow into an important branch of Earth System Science. MapObjects is surely to be used widely, and can play an important role in Geographic Information Systems. This study helps to understand the development of core GIS's function by using VCcombined with ComGIS.
Remote sensing monitoring provides objective and fast spatial-temporal information for dynamic landuse survey. Nevertheless, there exist no effective method and pattern to organize the data available, which holds back the service and application of this method. In this paper, techniques of segmental coding and logical digital saving are applied to organize data. Transformation matrix is used to organize changed information and SVGtechnique is utilized to extract vector path sets. Such data as vectors and attributes are integrated in an open CTGfile.