最新刊期
卷 ， 期 3 ， 1996
- 摘要：The extensive applications of GIS have shown its capabilities in storing, managing, analyzing and outputing spatial data efficiently. However, there seems to be several limitations in GIS, reflected not only in spatial modeling and analysis, but also in the employment of experience, intuition and expertise. The incorporation of other teclmologies may therefore be a good solution. In this regard, this paper explores the indispensability and the approach to the integration of GIS and ES. Then, a software system for urban zoning management called ZOMAN is presented, including its architecture, functions and application examples.关键词：GIS;ES;Integration
- 185
- |
- 194
- |
- 57
发布时间：2021-06-10 - 摘要：Cloud-cover noise offen occurs in remote sense image processing. How to remove theal effectis of cloud is the important task for image recognition and classification In this paper we propose a new removing cloud approach, we apply this approach to aerial image and satellite image. The result show this approach is effective.关键词：Cloud-cover;Filter;Removing cloud;Homomorphic
- 181
- |
- 1404
- |
- 135
发布时间：2021-06-10 - 摘要：According to the imaging principle of Synthetic Aperture Radra and dack-scattering characteristics of snow, authors examined the capability of snow-cover mapping with multifrequency and multipolarized SAR images from SIR-C carried by shuttle. The result shows that C-band HH and W images can be used to discriminate between wet-snow and snow-free area, but there is a prolem to separate rock from dry snow; L-band HH and VV images are easily to separate snow-cover area from others; and cross-polarized SAR images of C L-bands can be used to discriminate betWeen dry-snow and rock. So it is possible to map snowcover using SAR data.关键词：synthetic aperture radar;Back-scattering;Snow-cover extracting
- 147
- |
- 242
- |
- 8
发布时间：2021-06-10 - 摘要：In accordance with the specific characteristics of disaster restilted from mudflow and present conditions, the system integration strategy for assessment of mudflow disasters was proposed. The integration system for assessment of mudflow disasters was configured with externally linkage architecture based on the common interface medule and included two components, i.e. GIS and expert system. Thus central link of implementing the integrated system is construction of transformation function, accessing function and specific application frameworks. Transformation functions and accessing functions were performed as Dynamic Link Library so as to be shared by application programs. Application frameworks were expressed by Stepwise Input-Processing-Output graph （SIPO） and constructed by program manager and Multi-Document editor with OLE interface. After database on the Sunhugou watershed and knowledge base for mudflow hazard assessmeht were built up, mudflow hazard on the Sunhugou watershed has been assessed in this paper. Through comparison between field investigation and distribution map for mudflow hazard outputed by the integrated system the result shows that the integrated system is operable and highly reliable.关键词：Mudflow;Hazard assessment;GIS;Expert system;System integration
- 118
- |
- 285
- |
- 45
发布时间：2021-06-10 - 摘要：Surface weathering preduees coatings of mineral materials which may be similar to, or quite differeflt from, the minerals of the underlying parent rock. These coating are usually only microns to millimeters in thickness, but they completely control the reflectance spectra of the terrain. In a similar way coatings formed from adherence of wind-borne dusts, cemented or not, will also dominate the reflectance spectra as seen in remotely sensed imagery. Cemented coatings are often dark-colored （even black） and are usually termed "desert vanish" from their common occurrence in arid regions. Despite their featureless, dark color to our eyes, these coatings （often clays）, show characteristic reflectance minima in the short-wave infrared （SWIR） regions, by which their mineralogical composition can be deduced. Thus to relate remotely sensed imagery to actual ground "geology" reqinres a good knowledge of the surficial character of the exposed rock outcrops. It is not always possible to find "fresh" surfaces in the field, and one must always differentiate "upper-surface" spectre （and also "lower-surface" spectra） from the spectra of the "inner rock" materials. This paper describs the spectral effects in deeply-weatherad Mafic, Ultrabasic, and Felsic Rocks in arid terrains of the central Western Australia.关键词：Spectra;Desert varnish;Iron-oxide-bearing material（LDK）
- 158
- |
- 184
- |
- 5
发布时间：2021-06-10 - 摘要：Some models for estimating chlorophyll concentration are developed in this study by taking Daya Bay as an experimental site and Landsat-5 TM （Thematic Mapper） data as information resources, and combining the survey data of chlorophyll concentration in the surface coastal water. On the base of studying the spectral characteristics of chlorophyll and the mechanism of surveying chlorophyll concentration using remote sensing data, taking 75 band compositions of TM1-TM4 bands as the subfactors and the chlorophyll concentration as the mother factor, factor analysis was carried out by using the Grey System Theory. According to the results of the factor analysis, 5 band compositions, which have greater correlative degree to the mother factor, are selected for modeling. The error analysis shows that these models have high accuracy with the mean absolute relative error less than 11. 2% and relative standard error less than 6. 7%. Unlike the general way taking the ratio of TM2 or TM3 to TM1 as the best band compositions, this study shows that （TM3×TM4） is the best band composition for estimating chlorophyll concentration of the surface layer of coastal water, and the estimated accuracy can not be advanced by using the ratio of （TM3×TM4） to TM1 or TM2 or In（TM1+TM2） or In（TM1×TM2）.关键词：Chlorophyll;Remote sensing;Grey System;Model
- 141
- |
- 678
- |
- 130
发布时间：2021-06-10 - 摘要：Using the theory、technique and method of Geographic Information System （GIS）, this paper studies the development of Col Mine Geology and Survey Information System （CMGIS） in order to solve problems of Coal Mining. Based upon analysing on the main objective of CMPIS, the authors discuss the hardware configuration and logical structure of CMGIS at first. Then, the software modules of CMGIS are designed, and the concrete functions of CMGIS are developed. Compared to other application information system, CMGIS has the complete graphics function, especially the auto-mapping module can be used to compile many kinds of coal mine map automatically. Later, the application effectness of CMGIS is sununerized, and the existing problems of CMGIS are stated. The improving aspects and the optimal direction of CMGIS are pointed out at the end of the article.关键词：Geographic information system;Coal mining;Coal mine geology and survey
- 173
- |
- 375
- |
- 14
发布时间：2021-06-10 - 摘要：In case of emergency, time is very important. So it is necessary to find out the shortest way to save time so as to save the living and wealth. With the support of GIS, GPS and HBDS, this paper supplies a method of the shortest way, which is used in this system. This system provides the current space position of the system, the shortest way between two points on map, the shortest way to the nearest hospital or emergency center, and so on.关键词：GIS;GPS;HBDS;The shortest way
- 106
- |
- 123
- |
- 23
发布时间：2021-06-10 - 摘要：This paper discusses the dynamic change of rock infrared radiation temperature field in the experiment on rock mechanical properties. With the aid of AGA782 Thermalvision it was observed that the rock surface infrared radiation temperature rised with the increase of the stress on the rock sample, and the temperature rising 2-4 degrees centigrade was measured from where the rock broke. Moreover, the whole process of the rock infrared radiation temperature field variation caused by the change of the stress was obtained. That is, with the augment of the stress exerted on the rock sample, the rock surface radiation temperature tended to rise during the elastic deformation stage and decrease during the ductile deformation stage. This is a very valuable physical phenomenon. The observation results derived from the thermal images provide the theoretical basis for the ground stress monitoring by infrared remote sensing technique.关键词：Remote sensing;Infrared radiation;Thermal imaging system;Rock mechanics
- 101
- |
- 346
- |
- 34
发布时间：2021-06-10 - 摘要：Synthehc Aperture Radar （SAR） images are usually corrupted by speckle noise. In order to suppress the speclde noise and improve interpretation of the radar images, smoothing filters have been proposed in the literature. Among them, the most popular are used. Several types of filters are: the average filter, the median filter, the Frost adaptive filter, the tee adaptive filter. Recently, Rao et al. （1995） proposed a new method called the modified K-value adaptive filter. This paper is an intercomparison study of these filters using ERS-1 SAR data of the Washita area in Okalahoma, United States acquired on June 10,1992. Summaries of these filters are given. Results of applying these filters to the data are evaluated with two quantitative measures. Based on the intercomparison, the most appropriate filter of SAR image speckle noise in this study was the modified K-value adaptive filter.关键词：SAR image;Speclde noise;Smoothing filter
- 127
- |
- 404
- |
- 37
发布时间：2021-06-10 - 摘要：Based on the criteria for assessment of land degradation two synthetic maps of land degradation in different periods （1950’s and 1980’s） are prepared by using aerial photos and with the help of GIS. It has been shown that due to the long history of economic development more than 64% of land were cultivated or used in the studied area. Various grades of degraded land caused by water erosion occupied only 36% of the total land: some 5. 11% of this are severely and very severely degraded, 7. 38% moderately and more severely degraded and the other 23. 43% slightly degraded and non-degraded. Since downslope zonation of soil, vegetation and erosional features is obvious from top to foot of hill, same situation happens to spatial variation of degraded land. It has been proved that severely and very severely degraded land characteristic of bared badlands were not formed in recent decades due to deforestation as it was commonly thought, but its history could been traced back to at least Ming and Qing Dynasties （350-650 years B. P.）, even Tang, Song, Yuan and Jin Dynasties （650-1300 years B. P）. During the last few decades the development of land degradation manifests itself as drastic reduction. of non-degraded land and parallel increase of slightly and moderately degraded land.关键词：Land degradation;Jinhua-Quzhou basin;Remote sensing and GIS
- 116
- |
- 183
- |
- 15
发布时间：2021-06-10
- Postal code：100190
- Tel：010-58887052 Email：nrsb@aircas.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备20021838号-9
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0