面向新型测绘的时空数据属性连接及扩展方法研究     

王育红  刘康晨 《测绘通报》2021,(5):5-9

属性连接是整合集成新型测绘多源属性数据、扩展丰富实体信息、促进知识挖掘服务的重要操作和手段。在界定总结连接概念及类型的基础上,本文通过分析,明确了ArcMap现有属性连接工具在连接谓词、连接类型、连接基数等方面的局限。针对这些局限,选用目前流行的AO Addin技术,设计实现了一个属性连接扩展工具条插件——eJoin,详细讨论了该插件的主要功能及实现策略,并利用多种数据对其进行了试验验证。试验表明:该插件能够快速执行一般连接、自连接、m∶n连接、投影连接等操作并完整表达连接结果,为新型测绘时空数据属性连接提供了更加实用、便捷的工具支撑。  相似文献   

水利规划中基于航摄点云处理获取地表高程的研究     

刘忠贞  吴玉宏  蔡宗磊  刘明松  杜明义 《地理信息世界》2021,28(6):112-116

无人机航空技术的快速发展为地理空间信息外业数据采集提供了质的飞跃,但随之而来繁重的内业数据处理工作,生产效率提高不明显.如何充分地利用航摄成果快速实现地理信息产品高质量生产是目前业内普遍遇到的难题.本文通过生产实践,研究基于航摄点云分类综合处理方法提取地表高程信息及地形要素的方案,并验证分析该方案应用于水利规划中的可行性,为提高生产效率和工作质量提供参考.  相似文献   

鲸豚声信号实时采集与分析系统     

李玉红  徐铭  葛玉荣  黄城铭 《中国海洋大学学报(自然科学版)》2022,52(2):123-128

本文设计了一套基于FPGA的鲸豚声信号实时数据采集与分析系统,在采集存储水族馆内声信号的同时,应用改进的HHT算法处理鲸豚叫声中的click信号,实现实时的甄别瓶鼻海豚和白鲸功能,可用于针对大型哺乳动物的远洋实时跟踪科考。  相似文献   

Modeling land suitability/capability using fuzzy evaluation     

Fang Qiu  Bryan Chastain  Yuhong Zhou  Caiyun Zhang  Harini Sridharan 《GeoJournal》2014,79(2):167-182

Modeling the suitability of land to support specific land uses is an important and common GIS application. Three classic models, specifically pass/fail screening, graduated screening and weighted linear combination, are examined within a more general framework defined by fuzzy logic theory. The rationale underlying each model is explained using the concepts of fuzzy intersections, fuzzy unions and fuzzy averaging operations. These fuzzy implementations of the three classic models are then operationalized and used to analyze the distribution of kudzu in the conterminous United States. The fuzzy models achieve better predictive accuracies than their classic counterparts. By incorporating fuzzy suitability membership of environment factors in the modeling process, these fuzzy models also produce more informative fuzzy suitability maps. Through a defuzzification process, these fuzzy maps can be converted into conventional maps with clearly defined boundaries, suitable for use by individuals uncomfortable with fuzzy results.  相似文献   

新疆西准噶尔宏远钼矿床和吐克吐克钼铜矿床流体包裹体特征及成矿时代   总被引：5，自引：0，他引：5       下载免费PDF全文

鄢瑜宏  申萍  潘鸿迪  王军年  钟世华  刘晓刚 《地质科学》2014,(1):287-304

宏远（铜）钼矿和吐克吐克钼铜矿为新疆西准噶尔地区新发现的斑岩型矿床。流体包裹体测温和激光拉曼探针分析研究表明,宏远（铜）钼矿发育气液、气体和含子矿物包裹体等3类包裹体,气液比变化大,均一温度集中在140 ℃～200 ℃和260 ℃～340 ℃两个区间,吐克吐克钼铜矿只含有气液和含子矿物两类包裹体,气液比变化小,均一温度集中在180 ℃～220 ℃。两个矿区均发育高盐度和低盐度的NaCl-H₂O-CH₄-CO₂流体,显示含甲烷还原性流体的性质。宏远（铜）钼矿辉钼矿Re-Os同位素分析表明其成矿年龄为314.3±1.9 Ma,与西准噶尔包古图斑岩铜矿成矿时代一致。  相似文献   

Advances on Studies of Methane in the Arctic Ocean     

Li Yuhong  Zhan Liyang  Chen Liqi 《地球科学进展》2014,29(12):1355-1361

Methane(CH₄) is an important greenhouse gas, CH₄ concentrations in atmosphere hve increased by 2-3 times since the Industrial Revolution. Considering the huge CH₄ storage in the Arctic Ocean, the fast increasing flux and their consequences are attracting more and more attention. This paper summarized the advances in the study of CH₄ in the Arctic Ocean, especially the distribution pattern and air-sea flux and its biogeochemical cycle in the Arctic Ocean. It also presented the research prospect for the future.  相似文献   

Experimental Study on Adsorption of Rare Earth Elements on Kaolinite and Halloysite     

GAO Yuhong  FAN Chenzi  XU Hong 《《地质学报》英文版》2017,91(Z1):80-82

<正>1 Introduction The weathered crust rare earth deposits is one of the most significant rare earth deposits,which are mostly distributed in southern China,especially in the south of Jiangxi province(Chi et al.,2007).The compositions of these deposits,which are weathered from igneous rocks such as granite through biological,physical or chemical  相似文献   

城市化对北京室内外气温影响的研究   总被引：12，自引：2，他引：10  

张一平  张德山  李佑荣  马友鑫  刘玉洪 《气候与环境研究》2002,7(3):345-350

以北京市为研究对象,利用由于城市扩大而受到影响的北京近郊朝阳气象站室内外气温和受城市发展影响较小的远郊密云站气温资料,以及城市建成区面积和城市人口资料,通过比较分析,得出以下结果:北京市近郊区由于城市面积扩大和人口增加,导致了室内外气温均升高,其中室内气温升高幅度大于室外气温,冬半年大干夏半年;不论是冬半年还是夏半年,城市增温效应与城市人口均有较好地相关关系,城市人口的增加对平均室内气温的影响较大.以上结果有助于深入探讨城市化对城市气候的影响机制,并可为城市建筑的规划、设计提供参考.  相似文献   

Impacts of Different Land Reclamation Methods on Organic Carbon and Black Carbon in Soil in a Mine Subsided Area     

CAO Yuhong  LI Lulu  LIU Chonggang 《资源与生态学报(英文版)》2017,8(2):191-195

In this paper, changes in the amounts of organic carbon and black carbon in reclaimed soil were studied. The subsidence area was in a Xuzhou coal mining area that is part of a national land reclamation demonstration area. The significance of the paper is to explain the law of quality changes of reclaimed soil, improve the soil reclamation process and promote the sustainable use of soil in mining areas. In the study, four kinds of soils were collected using four land reclamation methods: coal gangue filling (CGF), mixed flat reclamation (MFR), mud pump filling (MPF) and fly ash filling (FAF); soil from the subsided area (SS) was used as the control. Organic carbon and black carbon on content were determined by elemental analysis, potassium dichromate titration and other methods. The result shows that reclamation methods do have an influence on the organic carbon and black carbon content in subsidence soil. The content of organic carbon and black carbon at different soil depths varies the most in FAF. Regression analysis of black carbon and organic carbon contents from the four different reclamation methods show that the levels are significant in all cases. Therefore, there is no obvious relationship between the proportion of black carbon and the accumulation of organic carbon in the study area.  相似文献   

LS-SVM曲面在多波束测深数据质量评估中的应用          下载免费PDF全文

刘玉红  王许  陈轶  范龙  黄贤源 《海洋测绘》2021,41(5):43-47

在利用曲面滤波方法对深度不符值进行自动筛选的过程中,针对多项式曲面函数无法有效削弱噪声影响的问题,提出了利用LS-SVM曲面求解深度不符值的方法。在对深度不符值计算方法分析的基础上,构建LS-SVM海底趋势面,该趋势面从整体上反映了海底地形的实际变化情况,并且保留了海底地形的细节信息,可有效削弱噪声的影响。实测算例表明,LS-SVM曲面筛选得到的重合点水深不符值不存在较大偏差,计算得到的水深测量结果,能准确地反映测量数据的成果质量。  相似文献