Three-Dimensional TIN Algorithm for Digital Terrain Modeling

The problem of taking an unorganized point cloud in 3D space and fitting a polyhedral surface to those points is both important and difficult. Aiming at increasing applications of full three dimensional digital terrain surface modeling, a new algorithm for the automatic generation of three dimensional triangulated irregular network from a point cloud is pro- posed. Based on the local topological consistency test, a combined algorithm of constrained 3D Delaunay triangulation and region-growing is extended to ensure topologically correct reconstruction. This paper also introduced an efficient neighbor- ing triangle location method by making full use of the surface normal information. Experimental results prove that this algo- rithm can efficiently obtain the most reasonable reconstructed mesh surface with arbitrary topology, wherein the automati- cally reconstructed surface has only small topological difference from the true surface. This algorithm has potential applica- tions to virtual environments, computer vision, and so on.

Evaluation and analysis on the tourism resources in Hami Region based on GIS mapping technology

According to the data from the national standard classification and investigation of tourism resources(GB/T 18972-2003) in Hami region,the abundance,quality and dimensional distribution of the tourism resources in Hami region were evaluated based on GIS mapping technology.The evaluation results on the tourism resources in Hami region are described as follows:there are rich tourism resources categories;the quality of tourism resources is ordinary;the resources distribute equably;the number of the historical resources is much more than the natural resources,but the 1atter still has great potential for developing.All the results of the evaluation can provide important references for strategic decision making of Hami region.

An Algorithm for Extracting Contour Lines Based on Interval Tree from Grid DEM

This paper proposes a new algorithm for determining the starting points of contour lines. The new algorithm is based on the interval tree. The result improves the algorithm＇s efficiency remarkably. Further, a new strategy is designed to constrain the direction of threading and the resulting contour bears more meaningful information.

Remote Sensing Image Classification Based on Improved Fuzzy c-Means

Classification is always the key point in the field of remote sensing. Fuzzy c-Means is a traditional clustering algorithm that has been widely used in fuzzy clustering. However, this algorithm usually has some weaknesses, such as the problems of falling into a local minimum, and it needs much time to accomplish the classification for a large number of data. In order to overcome these shortcomings and increase the classifi-cation accuracy, Gustafson-Kessel (GK) and Gath-Geva (GG) algorithms are proposed to improve the tradi-tional FCM algorithm which adopts Euclidean distance norm in this paper. The experimental result shows that these two methods are able to detect clusters of varying shapes, sizes and densities which FCM cannot do. Moreover, they can improve the classification accuracy of remote sensing images.

Photogrammetry Education for Multidisciplinary Geomatics in China

After briefly reviews the history of photogrammetry education in China, the development of undergraduate and graduate program, and the corresponding curricula design are analyzed by use of the data from Wuhan University in which the photogrammetry is awarded as the state-level key discipline. The academic educational program of photogrammetry in universities has trained students to perform tasks in all fields of the photogrammetric profession. In recent years, the nature of photogrammetry is changing and multidisciplinary geomatics are developing very rapidly, the educational program of photogrammetry has also changed in new concepts and structures to adapt very new technologies and the extension of the field. Finally, the prospect of photogrammetry education for the requirements of multidiseiplinary geomatics is proposed. The growing interest in fast and accurate 3D spatial data collection （such as city modeling and digital earth） results in the increasing need of photogrammetry as principal tool, photogrammetric courses are therefore requested to be upto date and to become one kind of the fundamental professional courses for university geomatics and remote sensing degree programs.

Discipline progress of mineral mapping of gold deposit in China

Sanjiang and Jiaodong areas are the important gold regions in China.The gold mineralization is correlated with the Mesozoic faults and its derivative faults in the granite or the contact zone between granite and base rock.The mineral mapping is one of the important approaches of prospecting mineralogy.The temporal and spatial band distribution of mineral,mineral combination and mineral typomorphism features are natural regularity rules,but this kind of band feature is sometimes hidden and thus in need of mineral typomorphism research and mapping to disclose this band feature and to serve for the prospecting of mineral.The changes of the mineral typomorphism feature are often embodied in the"through"mineral,the typomorphism features of the through mineral change like the gradient toward the ore body,and the changes of the features are most obvious and strongest toward the orebodies.The new American mineralogy mapping indicates the weak change of the mineral composition or structure will lead to the change of the shape and wave length position of the specific absorbent feature.Australian experiment lab investigation has held the reason of a series of mineral.The progress achievement of the remote sensing and computer analysis technology now permits a direct comparison directly between the lab and remote sensing data,so the good feature database of the experiment light spectroscopy can serve for drawing of the spacial distribution and remote sensing material.Mineralogy mapping raised the extensive emphasis in the international earth arena.

提升小学中高段学生英语百科类绘本自主阅读能力必要性及方法浅析

阅读素养是小学阶段学生综合语言能力发展的内涵,因而培养小学生的自主阅读能力,是小学英语教育的重要目标之一。英语百科类绘本既可以为学生提供丰富的百科知识的,又可以为教师所用引导学生收集信息、发展思维、拓展视野,帮助学生在学习语言知识的同时发展学生其他方面的知识,如世界知识,百科知识实现read to learn而非learn read to .

Heraclitus as a Process Philosopher

At least since Hegel identified Heraclitus as a philosopher who dealt with becoming, it has seemed obvious to perhaps most scholars that he was in some way a philosopher of process rather than a philosopher of being. （For the views of Hegel and some early interpreters, see Graham 1997, 46-50.） Indeed, ancient sources say that for him all things are in flux, and one cannot step twice into the same stream. Yet for all that, many interpreters of Heraclitus perhaps unwittingly portray him in ways that are inconsistent with his being a process philosopher. And there are those who wish to downplay the role of flux in his system as well. In any case, to call him a process philosopher remains a vague claim until an interpreter specifies in what sense he is committed to process. Even more important, perhaps, is the question whether Heraclitus can maintain a coherent theory of process, given interpretations both ancient and modem that portray him as violating the principle of non-contradiction---often precisely because of his theory of flux. In this paper I shall attempt to argue that Heraclitus is indeed a process philosopher, and more importantly to spell out in what way he is, and to defend his theory as a consistent and indeed philosophically sound starting point for understanding the world as a process; I will end by pointing out some ways in which his theory accords with modem scientific explanations of the world.