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31.
三角网是地学建模中最为基本的一种网络,由离散点生成不规则三角网是三角网生成过程中遇到的一种非常普遍的情况。本文研究离散点生成不规则三角网的逐点内插算法及实现过程中需要注意的若干问题,详细阐述由离散点数据如何逐步生成不规则三角网并给出了实现结果。 相似文献
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Jerzy Ladysz 《GeoJournal》2006,67(1):1-7
The shift to market forces in Poland, East Germany and Czech Republic has fundamentally reconfigured its economic geography. In particular, spatial inequalities between neighboring Polish, Czech and German border regions have re-emerged forcefully in response to new values, expectations and preferences. In this paper the example of coal mines illustrates the potency of spatial planning. The abundance of coal mines in the Polish, Czech and German borderland at or near abandonment and their proximity to ecological corridors make them candidates for renewed uses in industry or conservation. Attention will also be given to the main environmental problems caused by wrongly conducted spatial policy on this borderland. Transforming a landscape requires continuation of guidance and financial assistance of the European Union. 相似文献
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印太交汇区珊瑚礁大三角是全球海洋生物多样性最高的区域,孕育了印度-西太平洋海域接近60%的软体动物种类,同时也有很高比例的特有物种。该海域是全球软体动物生物多样性研究的热点区域。已有不同国家的学者相继对印太交汇区软体动物的多样性、分类与系统演化等方面开展了研究,并取得了一系列重要的成果。基于此,本文从软体动物的生物多样性格局、成因、以及其影响因素等角度出发,对印太交汇区软体动物研究的主要方面进展进行了综述。先后有物种起源中心、积累中心、重叠中心、幸存中心等多种假说被提出以解释其多样性的成因。印太交汇区软体动物生物多样性分布格局与板块构造作用、海平面的变化、海洋环流以及暖池等密切相关。本文也指出了目前研究中存在的主要问题,分析了未来的发展趋势及面临的挑战,以期为今后的相关研究提供参考和思路。 相似文献
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Dimitri Bulatov Peter WernerusChristian Heipke 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(6):907-918
We present a new procedure to compute dense 3D point clouds from a sequential set of images. This procedure is considered as a second step of a three-step algorithm for 3D reconstruction from image sequences, whose first step consists of image orientation and the last step is shape reconstruction. We assume that the camera matrices as well as a sparse set of 3D points are available and we strive for obtaining a dense and reliable 3D point cloud. Three novel ideas are presented: (1) for sparse tracking and triangulation, the search space for correspondences is reduced to a line segment by means of known camera matrices and disparity ranges are provided by triangular meshes from the already available points; (2) triangular meshes from extended sets of points are used for dense matching, because these meshes help to reconstruct points in weakly textured areas and present a natural way to obtain subpixel accuracy; (3) two non-local optimization methods, namely, 1D dynamic programming along horizontal lines and semi-global optimization were employed for refinement of local results obtained from an arbitrary number of images. All methods were extensively tested on a benchmark data set and an infrared video sequence. Both visual and quantitative results demonstrate the effectiveness of our algorithm. 相似文献
36.
梁红萍 《广东海洋大学学报》2004,24(5):80-83
从语义学中语义三角理论研究出发 ,分析了词义的选择、不同语言文化对概念的表达差异以及语义三角理论对翻译的指导意义 ,探讨了跨文化语境下对等翻译的可行性。 相似文献
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本文通过现代居里面与高温热水泉的分布、钻孔测温资料以及华南不同时代花岗岩带的分布,证明了右江盆地域处于地热异常区,分别根据广布于本区的上二叠统煤层的镜质组反射率、下三叠统中牙形石的色变指数,编绘了趋势性等值线图,并建立了变质古地热场,阐述了这一古地热场与成矿地热场之间的关系,最后作了两项应用:(1)结合成矿温度研究右江盆地域金矿层位的分带性,并提出一种预测思路;(2)推断隐伏岩体的存在及其埋深,并与高精度航磁的解译成果相印证,进而结合一些同位素年龄值,确定成矿期时存在岩浆活动。 相似文献
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顾及特殊地物的等高线自动生成浅析 总被引：1，自引：1，他引：0
以自定义实体作为等高线自动生成的载体，构造了以AcDbEntity为基类的CContour实体．通过该实体自动生成所需要的等高线。在讲述了等高线自动生成的一般过程后，强调在构造Delaunay三角网时，应考虑到地性线和特殊地物对Delaunay三角网构造的影响，利用它们对构造好的Delaunay三角网进行修正，从而构造出准确的Delaunay三角网。这对等高线生成设计有参考意义。 相似文献
39.
Pedro Fidelman Louisa EvansMichael Fabinyi Simon FoaleJosh Cinner Franciska Rosen 《Marine Policy》2012,36(1):42-53
Environment and development agendas are increasingly being characterised by regional-scale initiatives. This trend is in part motivated by recognition of the need to account for global drivers of change (e.g., climate change, migration, and globalisation), the aspirations of achieving large-scale ecological goals (such as maintaining ecosystem processes), and reconciling potentially conflicting priorities in multi-use planning. However, regional-scale governance is challenging and there is little theoretical guidance or empirical evidence to suggest how it can be achieved. This paper uses the Institutional Analysis and Development framework to highlight the diverse contextual factors that challenge governance of a large-scale marine common, using an example of the Coral Triangle Initiative. The analysis points to the need for a critical, reflexive approach to the Coral Triangle Initiative if it is to effectively navigate diverse contexts and reconcile multiple objectives in the region. Recognising the heterogeneous, multi-scale and interlinked nature of large-scale marine systems is critical. Coping with contextual complexity will require innovative approaches that strive to be inclusive of varied perspectives and actors, enable and support effective collective-choice arrangements at lower levels of organisation, and organise and link diverse institutional arrangements at multiple scales. Large-scale marine governance will also involve a great deal of experimentation and regular adjustments to governance arrangements to account for the dynamic nature of regional commons. 相似文献
40.
The Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security (CTI), adopted recently in response to the degradation of coastal and marine environments in the Southeast Asia-Pacific’s Coral Triangle, emphasises the need for using existing international and regional fora to promote implementation. Large-scale marine initiatives, including the CTI, very often must contend with a remarkably complex institutional system. This raises the question of whether and how such complexity can be conducive to marine resources management. To answer this question, this paper aims to better understand the governance context in which the CTI was established (i.e., map governance fragmentation/complexity), and explore how such a context may support the implementation of the CTI goals (i.e., examine normative interplay). To conduct this examination, it uses an objective method that allows users to view and explore institutional arrangements through a network approach. By documenting the system of existing institutions in the Coral Triangle, the study shows that the Coral Triangle governance system is illustrative of those of international environmental governance. It involves multiple policy domains, and features different institutional arrangements and variability in terms of geographical scope and main subject matter. Such a system is complex and fragmented, marked by jurisdiction and functional overlaps. The paper suggests interplay management, such as inter-institutional learning and enhancing institutional synergy, as a promising process to promote inter-institutional coordination. 相似文献