Volunteered geographic information research in the first decade: a narrative review of selected journal articles in GIScience     

Yingwei Yan  Chen-Chieh Feng  Wei Huang  Hongchao Fan  Yi-Chen Wang  Alexander Zipf 《International journal of geographical information science》2020,34(9):1765-1791

ABSTRACT

More than 10 years have passed since the coining of the term volunteered geographic information (VGI) in 2007. This article presents the results of a review of the literature concerning VGI. A total of 346 articles published in 24 international refereed journals in GIScience between 2007 and 2017 have been reviewed. The review has uncovered varying levels of popularity of VGI research over space and time, and varying interests in various sources of VGI (e.g. OpenStreetMap) and VGI-related terms (e.g. user-generated content) that point to the multi-perspective nature of VGI. Content-wise, using latent Dirichlet allocation (LDA), this study has extracted 50 specific research topics pertinent to VGI. The 50 topics have been subsequently clustered into 13 intermediate topics and three overarching themes to allow a hierarchical topic review. The overarching VGI research themes include (1) VGI contributions and contributors, (2) main fields applying VGI, and (3) conceptions and envisions. The review of the articles under the three themes has revealed the progress and the points that demand attention regarding the individual topics. This article also discusses the areas that the existing research has not yet adequately explored and proposes an agenda for potential future research endeavors.  相似文献   

Stormwater capture and antecedent moisture characteristics of permeable pavements          下载免费PDF全文

Rui Guo  Yiping Guo  Jun Wang 《水文研究》2018,32(17):2708-2720

An approach based on individual rainfall events is introduced to mathematically describe the hydrologic responses and estimate the stormwater capture efficiencies of permeable pavement systems (PPSs). A stochastic model describing the instantaneous dynamic water balance of a PPS is established, from which the probability distribution of the antecedent moisture content of the PPS at the beginning of a rainfall event is analytically derived. Based on this probability distribution and the event‐based approach, an analytical equation that can be used for estimating the stormwater capture efficiencies of PPSs is also derived. The derived analytical equation is verified by comparing its results with those from continuous simulations for a wide range of PPSs with different sizes and underlying soils and operating under various climate conditions. It was found that the antecedent moisture contents of PPSs at the test locations are usually fairly close to zero, suggesting that PPSs at these locations are always almost empty at the start of a rainfall event. The derived analytical equation accounts for many key processes influencing the behaviour and operation of PPSs; it may serve as an easy‐to‐use tool that is essential for the planning and design of PPSs.  相似文献   

北斗一张网业务管理与服务系统设计与实现     

唐晓霏  车一鸣  孙小超  魏以宽  赵鹏 《测绘通报》2020,(1):142-145

针对北斗一张网体系建设与运营项目的实际需求与现状，整合已有基础设施资源，深入研究挖掘了潜在的信息资源，搭建了一个标准化管理与服务应用统一平台——业务管理与服务系统，提高了系统的移动管理能力、系统管理水平及系统服务效率，改变了传统CORS的管理与运维模式，同时也为海量用户提供了更高效便捷的个性化服务，真正从应用层面上实现了规范化、体系化与便捷化。在这一系统的支撑下，北斗一张网服务体系确立了全新的管理机制，也为北斗未来更广泛地推广应用打下坚实基础。  相似文献   

基于北斗导航定位技术的通用型自然资源实地调查信息系统研究与实现     

胡恬  唐芝青 《测绘与空间地理信息》2020,(3):118-120,123

首先分析了目前传统外业调绘及外业调绘系统普遍存在的问题,随后提出了一种"基于北斗导航定位技术的通用型自然资源实地调查信息系统"的信息化技术解决方案,并对该方案的设计原则、总体架构进行了描述。最后,详细地分析了该技术方案涉及的关键技术。本文旨在为自然资源实地调查工作带来全新信息化作业模式,提出一套探索思路,贡献一份力量。  相似文献   

海上构筑物用海存在的问题及管理政策建议          下载免费PDF全文

李珊  徐伟  刘淑芬 《海洋开发与管理》2020,37(6):108-114

随着社会经济的发展和海洋资源开发利用水平的提高，海上人工构筑物呈现种类、数量和规模都迅速增长的态势。但目前我国大部分海上构筑物尚未纳入统一的管理体系，导致管理权限不清和管理环节缺位。文章分析我国海上构筑物管理的现状和存在的问题，从海洋管理实践出发，对海上构筑物管理进行有益探索，提出在协调众多涉海部门的基础上，从审批、登记、竣工验收、弃置管理、事中事后监管等方面，解决最紧迫的管理需求，先易后难地完善海上构筑物管理的缺位环节，逐步建立和完善海上构筑物管理制度体系，更好地服务于海洋经济建设。  相似文献   

无人船运动控制方法综述   总被引：1，自引：1，他引：0  

裴志远  戴永寿  李立刚  金久才  邵峰 《海洋科学》2020,44(3):153-162

为实现无人船海上自主作业,无人船运动控制的快速性、准确性以及鲁棒性亟待提高。首先从全驱动控制和欠驱动控制角度,分别概括了国内外无人船航向控制、航速控制、轨迹跟踪控制以及路径跟踪控制的主流控制方法。其次,归纳总结了处理海洋环境不确定扰动的研究进展,包括扰动的建模和消除、抑制扰动的主流方法。最后,总结了无人船运动控制现状与存在的问题,并从工程应用和理论研究两个角度对未来的研究方向进行了展望。  相似文献   

海洋信息技术新进展     

姜晓轶  康林冲  符昱  孙苗 《海洋信息》2020,35(1):1-5

海洋信息技术是认识和开发利用海洋最直接、最便捷的手段.本文主要概述自2015年以来,围绕海洋观测监测、海洋物联网、海上通信组网、海洋信息基础设施、海洋数据处理以及信息应用服务等方面的新发展和新技术,并对后续发展提出简要建议.  相似文献   

中国海洋生态环境特征分析          下载免费PDF全文

林天维  孙子钧  柴清志  严志宇  孙冰 《海洋开发与管理》2020,37(5):36-40

随着社会不断地发展，资源需求不断增加，海洋生态环境污染日益严重的问题开始逐渐显现出来。文章对近18年的相关数据进行计算研究，从水体质量、富营养化、赤潮情况等方面对我国海洋水体环境进行了分析，指出虽然我国四大海区水质问题逐年改善，但南海的近岸污染问题、东海和渤海的赤潮问题等仍需加以重视。文章的大量数据分析为我国建立更符合国情的海洋生态环境治理决策提供了参考。  相似文献   

State of seawater intrusion and its adaptive management countermeasures in Longkou City of China          下载免费PDF全文

ZHONG Hua-ping  WU Yong-xiang 《地下水科学与工程》2020,8(1):30-42

Longkou City is a coastal area,and lacks water resources.The overexploitation of groundwater causes seawater intrusion.At present,seawater intrudes an area of 68 km2.With the decrease of groundwater extraction,the seawater intrusion area has generally declined.The paper expounds the development process of seawater intrusion as well as the corresponding prevention and control measures of using groundwater replenishment and groundwater throttling in Longkou City.In view of the seawater intrusion problem in Longkou City,some adaptive management countermeasures are put forward,which include:Adjusting industrial and agricultural structure,promoting economic and social development to match water resources;improving water usage structure,optimizing the utilization of water resources;advancing the construction of a water-saving society,using water resources efficiently;implementing inter-basin water transfer,using water resources rationally;developing and utilizing unconventional water sources,making full use of water resources;strengthening water infrastructure construction,increasing the development and utilization potential of water resources;carrying out ecological restoration,protecting water resources and ecological environment;improving the management informationalization level,strengthening the capabilities of groundwater monitoring and management;increasing publicity,improving public awareness of participation.  相似文献   

Revisiting the death of geography in the era of Big Data: the friction of distance in cyberspace and real space   总被引：1，自引：0，他引：1  

Su Yeon Han  Keith C. Clarke 《International Journal of Digital Earth》2018,11(5):451-469

Many scholars have argued that the importance of geographic proximity in human interactions has been diminished by the use of the Internet, while others disagree with this argument. Studies have noted the distance decay effect in both cyberspace and real space, showing that interactions occur with an inverse relationship between the number of interactions and the distance between the locations of the interactors. However, these studies rarely provide strong evidence to show the influence of distance on interactions in cyberspace, nor do they quantify the differences in the amount of friction of distance between cyberspace and real space. To fill this gap, this study used massive amounts of social media data (Twitter) to compare the influence of distance decay on human interactions between cyberspace and real space in a quantitative manner. To estimate the distance decay effect in both cyberspace and real space, the distance decay function of interactions in each space was modeled. Estimating the distance decay in cyberspace in this study can help predict the degree of information flow across space through social media. Measuring how far ideas can be diffused through social media is useful for users of location-based services, policy advocates, public health officials, and political campaigners.  相似文献