Quantitative relations between spatial similarity degree and map scale change of individual linear objects in multi-scale map spaces   总被引：1，自引：0，他引：1  

Haowen Yan 《国际地球制图》2015,30(4):472-482

Quantitative relations between spatial similarity degree and map scale change in multi-scale map spaces play important roles in map generalization and construction of spatial data infrastructure. Nevertheless, no achievements have been made regarding this issue. To fill the gap, this paper firstly proposes a model for calculating spatial similarity degrees between an individual linear object at one scale and its generalized counterpart at the other scale. Then psychological experiments are designed to validate the new model, taking four different individual linear objects at five different scales as test samples. The experiments have shown that spatial similarity degrees calculated by the new model can be accepted by a majority of the subjects. After this, it constructs a formula that can calculate spatial similarity degree using map scale change (and vice versa) for individual linear objects in multi-scale map spaces by the curve fitting method using the point data from the psychological experiments. Both the formula and the model can calculate quantitative relations between spatial similarity degree and map scale change of individual linear objects in multi-scale map spaces, which facilitates automation of map generalization algorithms for linear features.  相似文献   

A cyberinfrastructure for community resilience assessment and visualization     

Kenan Li  Nina S. N. Lam  Yi Qiang  Lei Zou  Heng Cai 《制图学和地理信息科学》2015,42(4):34-39

Disaster resilience is a major societal challenge. Cartography and GIS can contribute substantially to this research area. This paper describes a cyberinfrastructure for disaster resilience assessment and visualization for all counties in the United States. Aided by the Application Programming Interface-enabled web mapping and component-oriented web tools, the cyberinfrastructure is designed to better serve the US communities with comprehensive resilience information. The resilience assessment tool is based on the resilience inference measurement model. This web application delivers the resilience assessment tool to the users through applets. It provides an interactive tool for the users to visualize the historical natural hazards exposure and damages in the areas of their interest, compute the resilience indices, and produce on-the-fly maps and statistics. The app could serve as a useful tool for decision makers. This app won the top 10 runners-up in the Environmental Systems Research Institute (ESRI) Climate Resilience App Challenge 2014 and the top 5 in the scientific section of the ESRI Global Disaster App Challenge 2014.  相似文献   

基于TIN的面要素聚合优化算法     

王彦坤  李光强  尹健  职露 《测绘科学技术学报》2015,32(2):183-186,196

针对TIN三角网在实现地图面要素聚合过程中效率低下的问题,提出了一种基于TIN面要素聚合的优化方法。首先,利用格网的方法聚类面要素,缩小TIN搜索范围;然后,在聚类的基础上进行TIN三角网的构建实现面要素的综合;最后,实验验证了综合结果,并通过对比证明了算法的效率。  相似文献   

The need for disciplinarity,interdisciplinarity and scientific societies-the cartographic perspective     

Jochen Schiewe 《地球空间信息科学学报》2021,24(1):160-166

Do we still need Cartography?Do we still need a cartographic society?These questions,which can also be transferred to other disciplines,are answered from disciplinary and interdisciplinary perspectives-which creates an ideal connection to the networked and interdisciplinary thinking of Gottfried Konecny.The need for Cartography as a discipline is discussed based on a view on historic,current and future functions of maps and changing research and development require-ments.With respect to interdisciplinarity,Cartography shows connections to various domains while more and more relationships with young areas from the field of Computer Science are developing.With regard to cartographic societies,their central role and importance as network-ing platforms are emphasized.Nevertheless,geographical and thematic granularities of societies as well as networking formats(including online versions)need to be evaluated and further developed on a constant basis.  相似文献   

大数据时代综合性城市地图集设计的思考     

杜清运  任福  侯宛玥  孙晓娟 《测绘地理信息》2021,46(1):16-20

大数据时代,数据要素和信息通信技术变革给综合性城市地图集的设计带来一系列新挑战,包括制图对象拓展到城市三元空间,制图内容聚焦大数据揭示的"城市性格",地图符号表达融合信息图表设计,地图阅读方式趋向"线上线下"融合等。城市地图集设计亟需适应时代特征,从科学、技术、设计、文化、媒体和产业6个维度寻求创新突破。以2020版的《深圳市地图集》为例,分析其空间、时间和属性3条设计主线,以及在内容体系、地图表达和工艺集成等方面的创新。  相似文献   

第三次国土调查的图斑自动综合方法     

梁磊  周启  任东宇  文学虎 《测绘通报》2021,(12):124-129

从第三次国土调查数据库快速缩编派生出多尺度数据库,是地图制图的重要任务。本文针对大量图斑,首先通过研究图斑栅格综合,减少碎图斑数量;然后构建图斑语义邻近度模型、空间几何拓扑模型,分析了顾及拓扑和地区地理特征约束下的地类图斑制图综合方法;最后形成了自动化图斑缩编生产工艺流程。基于上述方法,采用计算机编程技术研发国土三调缩编系统,并应用于四川省某县23万图斑量的三调数据并试验验证。试验结果表明,通过本文方法的成果符合专题制图要求,极大地提高了三调图斑的自动综合效率。  相似文献   

基于深度卷积神经网络的云检测方法     

段雅鸣  张锦水  朱爽 《测绘通报》2021,(4):33-39

本文将Fmask云检测结果作为标记样本对深度卷积神经网络进行训练以实现云检测。在仅利用可见光波段和近红外波段的前提下,本文方法的云检测总体精度达到87.65%,高于Fmask的86.92%,而且单景Landsat 8影像的识别用时18 s,远低于Fmask的72 s,具有更高的精度和效率。另外,该方法适用于不同的地表土地覆盖类型,具有很强的泛化能力,是一个通用性强的算法,为进一步的遥感应用打下基础。  相似文献   

基于Web的人口普查地图标绘系统的设计与实现   总被引：1，自引：0，他引：1  

罗斌  李洪省  王英杰  余卓渊 《地球信息科学学报》2009,11(6):826-832

本文根据人口普查地图制图的需求,从系统架构、功能设计等方面介绍了基于Web的人口普查地图制图系统的设计方案,讨论并解决了人口普查地理区域划分、人口普查地图在线绘制、人口普查地址编码等关键技术问题。该系统主要功能包括标绘底图制作、地图(点、线、面)标绘和符号化、标绘成果审核、地图打印、权限控制等,能够完全满足人口普查地图绘制中的区域划分及建筑物等地形地物和要素名称的标绘。如在第六次全国人口普查中得到应用,将能够首次实现全国"一幅图"的精细到调查小区级别的数字化人口基础地理数据框架,进而大大推进中国人口普查工作和数据分析的现代化进程,为充分发挥人口普查数据的作用和价值提升打下基础。  相似文献   

三维建筑综合基本方法的探讨   总被引：2，自引：0，他引：2  

葛磊  武芳  朱强 《测绘信息与工程》2009,34(2):15-17

分析了三维建筑分类和识别，探讨了取舍、化简、概括和位移等二维综合的基本方法的应用，总结了三维建筑综合具有方法多样性、实现复杂性和综合结果不确定性等特点。  相似文献   

双向缓冲区算法及其在海图线状要素综合中的应用研究   总被引：1，自引：0，他引：1  

高王军  彭认灿  陈轶  郭立新  刘国辉 《测绘科学》2009,34(2)

本文分析了海图线状要素自动制图综合的现状以及现有常用的几种自动制图综合的算法,介绍了双向缓冲区算法的概念并给出了双向缓冲区算法的定义,研究并证明了双向缓冲区算法的特性。分析了利用双向缓冲区算法综合海图线状要素的原理,并比较了双向缓冲区算法与现有算法在综合海图线状要素上的优越性。给出了几种确定缓冲区半径的方法,并通过实验验证了由这几种方法确定缓冲区半径的可行性。  相似文献