共查询到19条相似文献，搜索用时 125 毫秒
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基于影像匹配的自发地理信息道路精度评价与改善 总被引：1，自引：0，他引：1
针对无矢量参考数据自发地理信息道路精度难以评价的问题,提出了一种基于影像匹配的道路精度评价方法。首先提取影像与自发地理信息中的道路交叉口作为控制点,并将对应的交叉口进行匹配,以同名控制点的均方根误差作为自发地理信息的道路精度;然后以两组控制点分别构建Delaunay三角网,利用两组控制点的对应关系对每个三角网进行仿射变换,从而实现对自发地理信息道路的几何纠正,以提高其精度。最后以郑州市的Open Street Map道路数据进行试验,结果表明本文算法能够有效提高自发地理信息的道路精度。 相似文献
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通过分析地理信息数据生产中的数据质量和空间数据基础设施的数据质量内容和特性,基于数字南极地理信息公共服务平台建设中的数据内容,讨论了在地理信息数据生产和地理信息公共服务平台建设中质量控制和元数据制作工作的重要性,并以保证数字南极地理信息公共服务平台建设的数据质量为目标提出了数据质量元素和评价方法,最后就进一步提高平台数据质量提出了建议。 相似文献
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针对现有的大量地理信息服务存在质量要素数据缺失,且直接影响了地理信息服务质量评价的有效性问题,提出了一种基于PageRank的地理信息服务质量数据缺失处理方法。借鉴PageRank算法思想,结合两者之间的相似之处,在计算质量要素缺失数据时,同时考虑要素数据缺失的服务质量以及与其相似的服务的数量和质量,从而提高质量数据的完整度和准确度,便于后续地理信息服务质量的评价。选取德国人工智能研究中心发布的基于OWL-S的地理信息服务语义匹配测试集OWLS-TC4中有关地理信息领域的服务作为测试用例,通过与平均值填充法在数据缺失处理偏差值和准确率的对比分析实验,进一步验证了本文提出的基于PageRank的地理信息服务质量数据缺失处理方法的有效性。 相似文献
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本文提出一种分析志愿者地理信息(VGI)中点要素的空间语义交互方法,将要素类型对社区约定的表达作为评估空间语义交互的主要基础,通过开放街道图(OpenStreetMap,OSM)空间语义子集中元素的历史变化介绍了一种新的语义相似性方法。研究结果为构建辅助志愿者地理信息的贡献者的系统创造了条件,这种系统可以用来推荐新的要素类型,清理已有数据并且集成异源数据。 相似文献
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Modeling aggregated expertise of user contributions to assess the credibility of OpenStreetMap features 总被引：1，自引：0，他引：1 
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下载免费PDF全文 The emergence of volunteered geographic information (VGI) during the past decade has fueled a wide range of research and applications. The assessment of VGI quality and fitness‐of‐use is still a challenge because of the non‐standardized and crowdsourced data collection process, as well as the unknown skill and motivation of the contributors. However, the frequent approach of assessing VGI quality against external data sources using ISO quality standard measures is problematic because of a frequent lack of available external (reference) data, and because for certain types of features, VGI might be more up‐to‐date than the reference data. Therefore, a VGI‐intrinsic measure of quality is highly desirable. This study proposes such an intrinsic measure of quality by developing the concept of aggregated expertise based on the characteristics of a feature's contributors. The article further operationalizes this concept and examines its feasibility through a case study using OpenStreetMap (OSM). The comparison of model OSM feature quality with information from a field survey demonstrates the successful implementation of this novel approach. 相似文献
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Assessing the Accuracy of Volunteered Geographic Information arising from Multiple Contributors to an Internet Based Collaborative Project 总被引：2，自引：1，他引：1
G. M. Foody L. See S. Fritz M. Van der Velde C. Perger C. Schill D. S. Boyd 《Transactions in GIS》2013,17(6):847-860
The recent rise of neogeography and citizen sensing has increased the opportunities for the use of crowdsourcing as a means to acquire data to support geographical research. The value of the resulting volunteered geographic information is, however, often limited by concerns associated with its quality and the degree to which the contributing data sources may be trusted. Here, information on the quality of sources of volunteered geographic information was derived using a latent class analysis. The volunteered information was on land cover interpreted visually from satellite sensor images and the main focus was on the labeling of 299 sites by seven of the 65 volunteers who contributed to an Internet‐based collaborative project. Using the information on land cover acquired by the multiple volunteers it was shown that the relative, but not absolute, quality of the data from different volunteers could be characterized accurately. Additionally, class‐specific variations in the quality of the information provided by a single volunteer could be characterized by the analysis. The latent class analysis, therefore, was able to provide information on the quality of information provided on an inter‐ and intra‐volunteer basis. 相似文献
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杜浩强 《测绘与空间地理信息》2014,(10):209-211
结合地名地址数据的特点,着重分析了地名地址数据的质量评价体系。从采集的原始地名点和地址点数据生产及应用方面出发,通过明确评价指标和质量元素,采用定量和定性两种方法对地名地址数据进行质量评价,为完善相关评价机制提供参考。 相似文献
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Sepehr Honarparvar Rouzbeh Forouzandeh Jonaghani Ali Asghar Alesheikh Behnam Atazadeh 《国际地球制图》2013,28(13):1496-1513
AbstractRecommender systems (RS), as supportive tools, filter information from a massive amount of data based on the determined preferences. Most of the RS require information about the context of users such as their locations. In such cases, location-aware recommender systems (LARS) can be employed to suggest more personalized items to the users. The most current research projects on LARS focus on the development of algorithms, evaluation methods and applications. However, the role of up-to-date spatial databases in LARS is not a well-researched area. The up-to-date spatial information would potentially improve the accuracy of items which are recommended by LARS. Volunteered geographic information (VGI) could be a low-cost source of up-to-date spatial information for LARS. This article proposes an approach to enrich spatial databases of LARS by VGI. Since not all records of VGI are fitted for use in LARS, a mechanism is developed to identify useful information. Some VGI data sets refer to existing spatial data in the database while other VGI data sets are shared for the first time. Therefore, the proposed method assessed the quality of VGI with reference source (for VGI which is existed in the database) and VGI without reference source (for VGI which is shared for the first time). To demonstrate the feasibility of the proposed approach, a mobile application has been developed to recommend suitable restaurants to the users based on their geospatial locations. The evaluation of the method indicates that VGI can potentially enhance the functionality of the LARS in predicting the users’ interests. 相似文献
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On predicting and improving the quality of Volunteer Geographic Information projects 总被引：1，自引：0，他引：1
Gloria Bordogna Paola Carrara Monica Pepe Anna Rampini 《International Journal of Digital Earth》2016,9(2):134-155
Initiatives that rely upon the contributions of volunteers to reach a specific goal are growing more and more with the success of Web 2.0–interactive applications. Also scientific projects are testing and exploiting volunteers' collaboration, but the quality of information obtained with this approach is often puzzling. This paper offers a rich overview of many scientific projects where geographic contributions are committed to volunteers, to the aim of defining strategies to improve information quality. By describing real examples of Volunteer Geographic Information (VGI), the contribution establishes a categorization based on the characteristics of the information, tasks, and scopes of the projects. After a discussion on the relationships of categories and VGI quality, the paper analyses techniques to improve the quality of volunteered information according to the moment of its assessment (i.e., ex ante, ex post, or both with respect to information creation). The paper outlines the main limitations of the different approaches and indicates some guidelines for future developments. 相似文献
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空间信息服务质量评价 总被引：2，自引：0，他引：2
随着信息技术在测绘领域的广泛应用和信息化测绘的广泛实践,测绘不再只是提供地图或地图数据,而是提供包括空间数据在内的空间信息服务.首先提出空间信息服务质量是由空间数据质量、信息可达度以及信息交互质量三个质量指标决定的,其中每一个质量指标又包括若干下级质量指标,以此构成一个地理信息服务质量的指标树.在构建空间信息服务质量指... 相似文献
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介绍了DEM的NSDTF-DEM格式及Arc GIS明码Grid格式,后者的DEM格式应用更广泛并支持更多的GIS软件对其进行读取及处理,故本文通过自编程序实现了前者到后者的转换。 相似文献