1992 Vol. 17, No. 3
The integrated expert system tools are currently a popular area researched all over the world. GEST is an expert system tool integrated with knowledge reasoning, database managing, graphic processing, color controlling and Chinese typesetting, and it is based on the principle of synergy. It is an effective tool to develop graphic data processing-oriented expert system. This paper intruduces its structure, technique, implementation and application, etc.
In this paper, the datum of displacement is determined by means of robust estimation technique. Based on this datum, the special displacement information which impacts the homogeneous strain state is recognized and with the estimating the homogeneous strain parameters, the special displacement information is estimated as well. Furthermore, two periods data of triangulation chain in Ganzi-Tagong temple which covers xianshuihe fault are processed and the active characteristics in such zone are researched.
In order to resolve the normal heights of GPS nets in mountainous areas, a new geometric method considering terrain effect is worked out in this paper. From tests in two GPS nets, We can see that using this new method in mountainous areas can get comparable accuracy as in smooth areas. A mathematic modol resolving normal heights in GPS network is given, and accuracies of normal heights resolved from this model are analysed.
In this paper, the reliability of GPS baseline vector network is discussed. The reliability index and the method of inspecting of the appreciable gross error on a single baseline vector are put forward, Through calculation on practical surveyed network and simulated network, the some conclusions and suggestions on the reliability design of GPS baseline vector network are given.
In the paper, the relations of SME (stochastic model error) and FME (fuuctional model error), in particular, the SME's influence on choosing a functional model in adjustment, are discussed. Moreover, the effect of VCE (variance component estimating) on FME is studied. At last, some suggestions and conclusions are given.
In this paper, accrding to the elastic dislocation theory and the inversion method of the fault movement parameters with prior information, the design of GPS monitoring points in a fault area and its impact on the results of the inversion of the fault movement parameters are investigated by the numerical test, and the effect of detecting the fault movement for GPS points is tested. The impact of the random error and the gross error in the GPS points on detecting the fault activies are discussed.
This paper joins up with the method of main element analysis and the method of distorting mathematic model in modern designing of engineering control network, It puts forward multivariate analysis method in accuracy design of engineering control network based an spectral decomposition. In the article, the auther will introduce the fundamental principle of this method and illustrate its efficiency to judge the quality of control network designing with example.
The approach of evaluating the age of human's wrist bones using pattern identification is a popular method in China and abroad. The accuracy of this method is greately affected by expert's experience, photogrammetric geometry and quality of X-ray films. In particular it may result in large difference of assessment of teen-agers. This article presents a new approach using X-ray photogrammetry to determine patial locations and size of wrist bones, considering the weights of various bones proposed by experts, employing linear regression to simulate the relationship between their lceations and dimensions and the age of wrist bones for integrated evaluation. 82 teen-agers were chosen as a sample to test the new method. The result of the test was desired.
In this paper, the application of several qualitive and quantitive methods of analysis, such as statisitcal analysis and structural geological and seismic geological analyses in the research of fault structure, and its relation to earthquakes are discussed deeply. A series of iso-density maps for fault structre are compiled. So several new hidden faults and their attributes are discovered and discussed, and the relations between faults structures and earthquakes are also dealt with here. Active faults which may probably be fraught with earthquake and their dangerous parts as well as seismic regions that will have direct influence upon Wuhan city are pointed out.
The direct method has shown us its advantages in the procedure of strict digital geometric rectification, because of the central projection in each scan line of SPOT image and the time-sequeutial changes of exterior orientation elements for each line. This paper, therefore, proposes the principles and technologies for taking the direct method into use, and points out the key techniques and the approaches to assure the accuracy and reliability of anchor points. Since the direct method can correctly determine, without iteration, the exterior orientation elements of the line at which anchor point is located, the calculating speed is faster than indirect method and the experiment results are better in accuracy of anchor points, precision comparison for evoluating the interpolation within each grid cell when using anchor points as control points, and the cheek and the analysis for the geometric precision of rectified images, thus proving the resouableness and corrcctuess of the proposed principles and approaches.
This paper put forward requirments of color measure instruments for judging a color product. These demands include how to select two theoies of color measurement, measure geometry, size of measurefield and position of a test color, choice of standard light sources and norm observer types, show and output of measure value and requiement of measure speed and so on. These contenes play an important role in both design and use of color measure instruments.
Administrative units are often distinguished by using different colors in cartography. Based on Heawood Theorem and its proving steps, this paper forwards a method in which administrative units may be automatically colored in given number of colors by adjusting some colored units. This coloring process can color any administrative units without separated areas in at most five colors. In addition, color weights are introduced in this process to meet the requirement of balancing different color areas no a map. By analysing graphic features of adminostrative units and earto graphic requiremts, this paper finally points out that no available process can assign given number of colors for any administrative units with separted areas so that any two neighbor units have different colors.