湖南石墨矿成矿规律与资源潜力分析   总被引：1，自引：0，他引：1  

安江华  唐分配  李杰 《江苏地质》2016,40(3):433-437

湖南石墨矿具有分布集中、成矿类型单一、品质优良等特点。总结了湖南石墨矿的成矿规律,分析了接触变质型石墨矿的典型矿床特征,并建立其成矿模式。对石墨矿的成矿区带进行了划分,并对成矿区带的资源潜力进行了探讨。  相似文献   

基于规则的拓扑在地理国情普查空间数据质量检查中的应用     

马建芳 《测绘与空间地理信息》2016,(12):124-126

在研究ArcGIS基于规则的拓扑关系的基础上,探讨了基于规则的拓扑在第一次全国地理国情普查空间数据的质量检查中的应用,并以某县地理国情普查数据为例,进行拓扑关系的创建与验证。  相似文献   

基于数据立方体的多最小支持度关联规则在犯罪分析中的应用     

王海波  张永田  吴升 《测绘科学技术学报》2016,(4):405-409

为了快速获取候选项集的支持度,避免频繁访问数据库而造成效率低下的问题,在MSapriori算法的基础上引入数据立方体,提出DC_MSapriori算法。该算法无需多次扫描事务数据库,减少了I/O操作,降低了搜索开销。实验基于福州市鼓楼区各大医院周边的案事件数据,快速挖掘出犯罪时空模式,验证了算法的有效性。  相似文献   

基于GIS的岷江上游流域土地利用／覆被变化研究     

李茂娇  杨斌  詹金凤  高桂胜  王世举 《测绘工程》2016,25(6):41-45

以岷江上游流域为对象,选取3期9景TM/+ETM遥感影像,通过多步骤最大似然监督分类、变化检测,结合空间动态分析测算模型,分析近20年土地利用/覆被变化情况。结果表明:从整个流域分析,林地面积减少,主要转化为未利用地、建设用地和耕地;未利用地在前8年以每年3.7%、后8年以每年0.4%的速度增加;建设用地在1994—2002年以每年34%的速度增加,到2002—2010年增长速度减缓;耕地总面积减少54 431hm2;从县域分析,1994—2002年间,松潘和黑水县大面积林地转为未利用地;2002—2010年间,松潘县未利用地转为林地和建设用地,茂县和汶川县未利用地面积大幅增加。该研究结论不仅为国土资源管理部门优化土地利用结构提供依据,亦为当地政府实现生态资源可持续发展提供数据支撑。  相似文献   

Implications of climate change for the management of North Sea cod (Gadus morhua)   总被引：1，自引：0，他引：1  

Kell  Laurence T.; Pilling  Graham M.; O'Brien  Carl M. 《ICES Journal of Marine Science》2005,62(7):1483-1491

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Another diet of worms: the applicability of polychaete feeding guilds as a useful conceptual framework and biological variable   总被引：1，自引：0，他引：1  

Paulo Roberto Pagliosa 《Marine Ecology》2005,26(3-4):246-254

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滦河三角洲及其周边海岸土地利用/覆被变化的遥感研究          下载免费PDF全文

郜昂  黄海军  樊辉 《海洋科学》2007,31(1):43-48

基于1987年和2000年LandSat卫星影像的分类结果,结合常规调查资料,得到了滦河三角洲及其邻近海岸地带近13年来土地利用/土地覆被变化的动态信息。通过对地类变化的细致分析,得出本区研究时段内自然与人类活动情况的地面指示。  相似文献   

Remote Sensing of Mangrove Change Along the Tanzania Coast     

Yeqiao Wang  Gregory Bonynge  Jarunee Nugranad  Michael Traber  Amani Ngusaru  James Tobey  Lynne Hale  Robert Bowen  Vedast Makota 《Marine Geodesy》2003,26(1):35-48

This article contributes to the understanding of the changes in distribution and total area of mangrove forests along the mainland Tanzania coast over the past decade. Mangroves are recognized as critical coastal habitat requiring protection and special attention. The Tanzania coastline forms a suitable habitat for establishment of mangrove forests. Mangrove forests are distributed from Tanga in the north to Mtwara in the south covering approximately 109,593 hectares from 1988-1990 and about 108,138 hectares in 2000. The largest continuous mangrove stands are found in the districts of Rufiji, Kilwa, Tanga-Muheza, and Mtwara. Comparison of data between these two time periods shows that the geographic coverage of mangroves has no dramatic change in the past decade. The Tanzania Mangrove Management Project and other closely related programs and efforts pertaining to mangrove conservation contribute to direct restoration and natural regeneration of mangroves. This study documents the changes of mangroves and demonstrates that remote sensing and GIS offer important data and tools in the advancement of coastal resource management and ecosystem monitoring. Application of geographic information technologies is critical for improved coastal resources management and decision making for sustainable development in Tanzania.  相似文献   

基于名画的数字地图设计初探     

李汝嫣  焦继宗  颉耀文  段含明  魏宝成 《测绘通报》2019,(11):114-120

绘画艺术具有基于情感体验唤起思想的能力，名画作为绘画艺术作品具有色调丰富、对比度高及色彩和谐的特点，尝试将其应用到地图设计中有一定新意。本文简单介绍了色彩学基本原理，提出了一种基于名画的地图色彩设计方法。通过提取名画的调色板，并分析其色彩模式；结合传统的地图制图规则从构图和色彩方面进行地图设计，并进行效果对比分析。结果表明：在地图设计中，基于用户需求选用与制图区域视觉结构相似的绘画，可以更好地在地图上表现出绘画的色彩及感情特征；参考绘画的色彩模式实现地图要素与真实地物的关联，能在地图上反映出制图区域的景观色彩特征和文化精神风貌。因此，该方法对于指导地图色彩方案设计、以"用户为中心"的地图设计有一定的参考价值。  相似文献   

Methods for ultimate limit state assessment of ships and ship-shaped offshore structures: Part I—Unstiffened plates     

Jeom Kee Paik  Bong Ju Kim  Jung Kwan Seo 《Ocean Engineering》2008,35(2):261-270

The present paper is Part I of a series of three papers prepared by the authors on the methods useful for ultimate limit state assessment of marine structures, that have been developed in the literature during the last few decades. It is considered that such methods are now mature enough to enter day-by-day design and strength assessment practice. The aims of the three papers are to conduct some benchmark studies of such methods on ultimate limit state assessment of (unstiffened) plates, stiffened panels, and hull girders of ships and ship-shaped offshore structures, using some candidate methods such as ANSYS nonlinear finite element analysis (FEA), DNV PULS, ALPS/ULSAP, ALPS/HULL, and IACS common structural rules (CSR) methods. As an illustrative example, an AFRAMAX-class hypothetical double hull oil tanker structure designed by CSR method is studied. In the present paper (Part I), the ultimate limit state assessment of unstiffened plates under combined biaxial compression and lateral pressure loads is emphasized using ANSYS, DNV PULS, and ALPS/ULSAP methods, and their resulting computations are compared. Part II will deal with methods for the ultimate limit state assessment of stiffened panels under combined biaxial compression and lateral pressure using ANSYS, DNV PULS, and ALPS/ULSAP methods, and Part III will treat methods for the progressive collapse analysis of the hull structure using ANSYS, ALPS/HULL, and IACS CSR methods.  相似文献