最新刊期
卷 ， 期 1 ， 1988
- 摘要：<正> 中国地理学会环境遥感分会和煤炭部航测遥感公司联合筹备的全国第七届遥感学术讨论会,于1987年11月23日—26日在西安市举行。出席会议的有来自全国各地的科研、教育、生产、新闻出版等部门的专家、学者共65人。
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发布时间：2021-06-10 - 摘要：Tremendous changes have taken place for rivers, lakes and coast line in the North China plain over the centuries. Study on changes of these water area have great significance for water resource exploitation, land use planning, industry and agriculture.We can recognize the trace of water area change more quickly and correctly than conventional method by using multi-times and multi-types remote sensing data making process of image match and enhencement with computer and optical equipments. Mean while, the features of water area changes in ancient time can be recovered through comparing Landsat data and air-photo with the history materials.Remote sensing technique is very efficient for monitoring quantitative changes of water area in shortterm. The study in this paper shows that since 1855, a piece of land has been formed in Yellow River delta at the rate of 23.7 km2/year, and the water area of Baiyangdian lake went down by about 426km2 from 1960 to 1985.Through systematic analysis on water area changes in this region with remote sensing data, the results show that the frequency of these river changes have become less and less under the control of manpower, the area of lakes has cut down year by year, while the coast line has continually moved towards the sea in the river mouth. The changes of almost the whole water area have been affected by Yellow River activity in ancient time, but mankind have been playing an increasinly important role on water area changes in modern time. For instance, the drying up of Baiyangdian lake is mainly caused by mankind activities, such as increase of water supply for industry and agriculture, a great quantity of reclamation etc.
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发布时间：2021-06-10 - 摘要：In the northern slope of Tianshan Mountain, Xinjiang, with Landsat MSS data, the grassland classification and mapping were studied. Based on the analysis of some spectral properties of grasslands and the separability between the ground classes, with the topographic types, the distinct 42 classes （27 grassland classes） were classified by a maximum-likelihood classifier. The classification accuracy of 86 percent ground classes is above 80 percent. Computer plotting that draws the line map of grassland types （scale 1:100,000） from the classification result was proposed. It speeds up 200--300 times than manual mapping. The methods to obtain the Digital Terrain Model （DTM） from contour map by scan digitizing were studied. With the DTM the grassland classification accuracy in the mountain areas was improved efficiently.
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发布时间：2021-06-10 - 摘要：An approach to the computerized recognation and classification of different types of forest and it’s distribution from satellite image data is described. Some algorithms, such as "THE RECOGNIZING ENHANCEMENT TECHNIQUE", "THE SUPERVISION OF CLASSIFICATION BY A MULTISPECTRUMS FUZZY ALGORITHM", will be discussed in detail. The result of the classification will be shown in the form of photographs for the region under test, ist area is about 165,000 ha. Compared with the results of other methods, such as a visual interpretation of images or on sight feild classification of the tree types, our classification achieved a relative statistical accuracy of approximately about 86-90%.
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发布时间：2021-06-10 - 摘要：We present a forest inventory expert system using both remotely sensed images and forest ecological information with emphasis on the development of forest ecological models its knowledge representation and Fuzzy inference.Initial studies have shown that expert system can not only improve forest image interpretation but also present a new idea to develop expert system for remotely sensed image interpretation. Confined to the test Conditions, the study is not very complete. In some respect, such as the extraction of forest ecological models, further studies should be made.
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发布时间：2021-06-10 - 摘要：It is very abundent for lead-zinc polymetallic deposits in Lanping area, Yunnan, where there are large scale lead-zinc deposites. Digital image processing was given in this paper, aimed at the study of the structures of controlling rocks and ore deposites which are concerned with the lead-zinc polymetallic deposites in this area. Its major processing functions are as follows: contrast enhancement, ratio synthesis, KL-trasformation and spatial convolution, etc., which was made out by the M-70 image proessing computer of SIOI system. Treated results show that there is plenty of imaging tones and laminated textures, and a great deal of information of geology and ore. Combined the geological conditions of the area with the genetic relations of the information of linear structures, circular structures, color anomalies, etc., and the known ore deposits, mineralizd points, geophysical and geochemical anommalies, auther make a calculation on mineral resources. The results show that there are six metallogenic belts, ten prognostic metallogenic prospect provinces and fourty-two prognostic mineral occurrences in the study area. Among those there are twenty Ist-order prognostic mineral occurrences and four Ist-order prognostic metallogenic prospect provinces. After inspection for some prognostic points, auther find two lead-zinc mineralizations.
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发布时间：2021-06-10 - 摘要：Taoling Pb-Zn orefield was thoroughly investigated by many geologists since 1950’s However, there are many different ideas about the ore-controlling regularity. In order to probe the effectiveness of ore-finding with the remote sensing technique, based on predecessors’ work, the studies on the characteristics of the geological structures and ore-finding prospects, have been made with the aid of the digital processing images of remote sensing, and a good result have been achieved.The processing of images was carried out in the IPOS/101 computer. The processing contents include geometric restoration and correction, colour enhancement, contrast stretching, frequency enhancement, algebraic calculational enhancement and non-controlling classification, etc.. More than 10 methods, compound, ratio, convolve, fourier transform, cluster analysis, were adopted, and 33 images were obtained.By the interpretation of digital processing images, the linear and circular structures can be obviously determined, therore-controlling characteristics of faults can be intuitively found, and the favorable ore-finding areas can Be located. All of these provide some important re-ferrentia1 information about exploration for minerals.
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发布时间：2021-06-10 - 摘要：This paper describes a method of reconstructing polygons by digitized line segments in a map coverage. The order and direction of digitization are arbitrary. Based on the analysis of topological relationships of the basic graphic unts: Polygon, Line and node, the emphasis of the discussion is placed on the linkage of Lines, the sequential searching for Lines which the polygon consists of, transaction of islands, and attribute coding of polygons. As a result, the series records related to the polygons are then produced for vector-based geographic information systems.
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发布时间：2021-06-10 - 摘要：There exist the spectral information and the spatial information in a remote sensing image. Discriminating a pixel depends not only on its spectral value, but also its spatial position and the relationship between the pixels. The spatial information, existing in an image, is usually subdivided into types-texture and context. This paper is about the classification models using contextual information. Three Markov mesh models are structured, the models then are used for contextual classification. The methods of estimating the spatial correlation parameters are given. A recursive contextual classification procedure, algorithm and programming is presented. The effectiveness and efficiency of the classification models is proved by experiment.
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发布时间：2021-06-10 - 摘要：Chlorophyll concentration in water is an important parameter in waters study. But conventional methods are time-consuming and strenuous. In this paper, the reflectances which chaiacterized the nature of chlorophyll concentration in 400-1100 nm band in spectrum were ased to regress with chlorophyll concentrations which were measured in Reservoir Miyun. According to multi-linear regression equation, the chlorophyll concentrations estimated with correlation coefficient more than 0.94. The similar results were obtained by using step regression analysis. The different methods for estimating chlorophyll concentration were compared and possibility of monitoring chlorophyll concentration in water using reflectance data in Landsat MSS, TM ,and Nimbus CZCS bands was discussed.
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发布时间：2021-06-10 - 摘要：<正> 《地理学遥感技术应用论文集》已于1987年6月由气象出版社出版。该文集收录论文20余篇，内客包括遥感地学应用和技术方法两部分。应用部分介绍了地貌、水文、气候、制图等学科的感应用成果，重点反映了黄河遥感的应用和卫星遥感制图的理论；技
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发布时间：2021-06-10
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