最新刊期
卷 ， 期 3 ， 1986
- 摘要：The present paper discussed the interpretation of the salinized soil, alkalized soil, aeo-lian sandy soil and waterlogged soil on the color near-infrared photos of Huang-huai-hai plain. The analysis of the spectral differences between these kinds of soil and their background soil indicates a reliability of interpreting them on the color nearinfrared photes. Because the close relation between the density differences of these soil images on the color near-infrared films and the change of colors of the photos, not only salinized and alkalized soil, aeolian sandy soil and waterlogged soil can be distinguished, but also the soils of different degree of salinizati6n and solonization can be interpreted. Using color near-infrared photos., not only salinized soil and alkalized soil, but ever-flooding soil, seasonal-flooding soil and easy-flooding soil can be distinguished by simultaneous interpreting them on the color near-infrared photos taken in spring and autumn. The results show the interpretation accuracy of aeolian sandy soil being the most high, waterlogged soil second, and salinized and alkalized soil low. Total accuracy can reach 90%.
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发布时间：2021-06-10 - 摘要：In the article, the software interface of the IRSA-2 Digital Image Processing Subsystem with the AOS operating system of the Data General Eclipse S140 computer is descri-ted. Few alternatives have been compared and tested, and the Inter-Process Communication bechnique has been used, with this technique, the user device is connected into the AOS operating system which founded the base for development of the IRSA-2 Digital Image Processing S stem. In IRSA-2 system, the image disppay device can be shared by multiu-sers by means of utilization of virtual image display technique. Therefore, the computer resources are used efficiently.
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发布时间：2021-06-10 - 摘要：This paper introduces a simple method of colour enhancement and classification through C-4500 image processing system.The main steps are as follows. First, on the display screen of the image processing system, colour-code different density numbers of B/W MSS image for study area. Second, co-mparing known and dishtinguishable image interpretation key, may confirm what homplogues of different density numbers are. Then, eshtablishe a colour coding plan based on the histogram of brightness numbers of landsat digital image. This way, we engage in supervised colour classification to the image and a definite colour represents certain object.This means a chives complete success in studing on the underground water distribution and its flowing direction, the area of pressure water, the relation between the desert vegetation and the underground water of gobi and desert area in the southern margin of Junggar Basin （Jungghariya）, Xinjiang.
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发布时间：2021-06-10 - 摘要：The use of TM imagery in the preparation of thematic maps for a large city such as Shanghai is a rather significant research work. In this paper, authors made a survey of the use of TM imagery in the preparation of thematic maps concerning land use, drainage system, geomorphology, urban geography etc., and showed the precision of mapping and results were quite satisfactory. Therefore, this approach has a broad prospect in such application.
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发布时间：2021-06-10 - 摘要：This paper describes briefly the components and functions of the LRIS, and examines its applications in land evaluation by taking a typical experiment in Xiamao, Fujian province.In this research, the authors give the factor combination method for rating the land types, and accomplish successfully the automatic information retrieval of the land types and landforms.Finally, the land rating map of analysing the land resources in the Xiamsro area has been generated （Fig. 7）, which provides the basis for making different rational use of land at various levels of suitabilities according to local conditions.
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发布时间：2021-06-10 -
Establishment and Application of a County Level Geographic Information System Based on Microcomputer
摘要：This work describes the method of regional geographic information system and constructive data base on county level, including air remote sensing information, maps, ground truth investigation and statistical data. The data base is an information intergration of geographic features, social and economical elements, nature specifications and locations. The work explains the data base design, mathematical models and data organization method, In addition, it also gives some examples of inquiry, searching, digital terraining model, contour plotting, 3-dimension grapl and bar chart. In conjection with practical applications, a method library has been established.- 114
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发布时间：2021-06-10 - 摘要：In this paper, the authors have summarized their methods and expriments on the use of the auxiliary data in the classification and post-processing for the remotely sensed image data. The results show that a better classification accuracy can be obtained and the application effects are rather satisfactory.
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发布时间：2021-06-10 - 摘要：The article primarily experiments a new method for estimating reservoir submergence loss from landsat. First, satellite image of experimental region, transformed to Gaussian coordinate, is registered to digital terrain image of the same region. Secondly, boundaries of reservoir submergence are determined with elevation and slope of digital terrain model （DTM）. It develops a statistical method for modifying the error caused by calculating an area with grids. Land use of this region is classified by fuzzy pattern recognition, hybrid pattern （fuzzy cluster and fuzzy pattern recognition together）, cluster and maximum-likelihood pattern. The classification accuracy of hybrid pattern is about 79.2 percent.The experiment shows that above method is able to satisfy the request of submergence loss survey for reservoir planning.The article paies special attention to the importance of incorporation of geography information with satellite data. Specially, the region, generally, speaking, is mountainous and study contents include many social and environmental problems which can’t reflected by remote sensing image. Therefore, this incorporation may greatly improve the level of estimating reservoir submergence loss by space renote sensing.
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发布时间：2021-06-10 - 摘要：The velocity error of the airborne SAR will cause the deviation of the Doppler spectrum centroid. The deviation can be corrected by the clutter-lock system. In this system, the error signal of the deviation may be detected by the phase comparator. This paper briefly relates the principle to detecte the error signal using the phase comparator, and derive the analytic formula of the deviation error signal of the single point target.An example and the estimation method about the maximum correct range of the deviation error are given.
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发布时间：2021-06-10
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