针对以往Open Street Map(OSM)数据质量评价中只考虑片面评价指标或只考虑单一层次评估对象的不足,本文选取典型研究区,以来自政府规划机构的权威数据集作为参照数据,基于模糊综合评价法,设计了质量评价指标与空间层次相结合的多层次多...针对以往Open Street Map(OSM)数据质量评价中只考虑片面评价指标或只考虑单一层次评估对象的不足,本文选取典型研究区,以来自政府规划机构的权威数据集作为参照数据,基于模糊综合评价法,设计了质量评价指标与空间层次相结合的多层次多粒度OSM路网目标数据质量评估模型,从单一目标、群组目标和整体目标3个粒度,集成构建集个体数量控制与群体结构控制于一体的数据质量评估指标体系,并解决评估模型中隶属度确定与最优组合权重赋权的关键技术问题,实现了宏观与微观相结合、全局与局部相结合的OSM数据质量的多维度多层次综合度量。实验结果表明,该方法具有可行性和实用性,可为基于VGI数据源实现相关行业应用提供实证依据和可靠的数据质量评估方法。展开更多
OpenStreetMap has a large number of volunteers.There is a hypothesis that volunteers with different cultural backgrounds may have different editing behaviors when contributing to OSM.It may be strongly related to data...OpenStreetMap has a large number of volunteers.There is a hypothesis that volunteers with different cultural backgrounds may have different editing behaviors when contributing to OSM.It may be strongly related to data quality and data reliability on OSM.As for the heterogeneity and the reliability of OSM data,previous research usually focuses on the geometric accuracy,spatial location accuracy and semantic integrity of OSM data,while few researchers have analyzed these problems from the perspective of editing behavior.On the grounds of relationship between mapping motivation and editing behavior,the dispersion of editing trajectory and clockwise direction index are proposed in the paper to explore whether the volunteers are sufficiently motivated and knowledgeable.In the experiments,the historical OSM data of four countries suggested that developed countries have lower trajectory dispersion.The lower degree of trajectory dispersion reflects the higher concentration and professionalism of volunteers.A high degree of drawing direction consistency shows volunteers who mapped French data were natives with local knowledge.From this point of view,this paper verifies that volunteer editing behavior is an effective method to analyze data quality heterogeneity and data reliability.展开更多
为了解决来自非专业用户协同编辑的众源地理空间数据质量问题,提出了一种众源地理空间数据质量评价技术框架。针对众源开放街道地图(open street map,OSM)数据特点,选取数据完整性、属性信息准确性和定位精度三方面质量要素,提出了面向...为了解决来自非专业用户协同编辑的众源地理空间数据质量问题,提出了一种众源地理空间数据质量评价技术框架。针对众源开放街道地图(open street map,OSM)数据特点,选取数据完整性、属性信息准确性和定位精度三方面质量要素,提出了面向众源开放街道地图(OSM)空间数据的质量模型和计算方法。展开更多
随着Web2.0的高速发展,基于用户创建的地理数据共享平台为广大用户提供了丰富的数据源。这种基于用户的自发地理信息(VGI)受到其数据采集、表达等特点的限制,其数据质量严重影响其进一步地应用。以VGI中较成功的案例——Open Street Map...随着Web2.0的高速发展,基于用户创建的地理数据共享平台为广大用户提供了丰富的数据源。这种基于用户的自发地理信息(VGI)受到其数据采集、表达等特点的限制,其数据质量严重影响其进一步地应用。以VGI中较成功的案例——Open Street Map(OSM)为例,对其路网数据质量和应用进行评价。首先从OSM数据的特点出发,给出了数据长度完整性和道路名称属性完整性2个定量质量要素的描述方法;其次选取国内外大、中、小4个城市做为实验区,与Baidu地图、Google地图的路网数据从长度和道路名称属性完整性进行比较、分析;最终通过实验结果表明,与Baidu地图相比,OSM的路网数据完整性和现势性在国内的3个城市整体上相当,但在国外具有较明显的优势,如果对其做进一步的处理,可以作为Baidu地图在海外电子地图的路网数据,进一步提高其应用价值。展开更多
文摘针对以往Open Street Map(OSM)数据质量评价中只考虑片面评价指标或只考虑单一层次评估对象的不足,本文选取典型研究区,以来自政府规划机构的权威数据集作为参照数据,基于模糊综合评价法,设计了质量评价指标与空间层次相结合的多层次多粒度OSM路网目标数据质量评估模型,从单一目标、群组目标和整体目标3个粒度,集成构建集个体数量控制与群体结构控制于一体的数据质量评估指标体系,并解决评估模型中隶属度确定与最优组合权重赋权的关键技术问题,实现了宏观与微观相结合、全局与局部相结合的OSM数据质量的多维度多层次综合度量。实验结果表明,该方法具有可行性和实用性,可为基于VGI数据源实现相关行业应用提供实证依据和可靠的数据质量评估方法。
基金National Natural Science Foundation of China(No.41771484)。
文摘OpenStreetMap has a large number of volunteers.There is a hypothesis that volunteers with different cultural backgrounds may have different editing behaviors when contributing to OSM.It may be strongly related to data quality and data reliability on OSM.As for the heterogeneity and the reliability of OSM data,previous research usually focuses on the geometric accuracy,spatial location accuracy and semantic integrity of OSM data,while few researchers have analyzed these problems from the perspective of editing behavior.On the grounds of relationship between mapping motivation and editing behavior,the dispersion of editing trajectory and clockwise direction index are proposed in the paper to explore whether the volunteers are sufficiently motivated and knowledgeable.In the experiments,the historical OSM data of four countries suggested that developed countries have lower trajectory dispersion.The lower degree of trajectory dispersion reflects the higher concentration and professionalism of volunteers.A high degree of drawing direction consistency shows volunteers who mapped French data were natives with local knowledge.From this point of view,this paper verifies that volunteer editing behavior is an effective method to analyze data quality heterogeneity and data reliability.
文摘随着Web2.0的高速发展,基于用户创建的地理数据共享平台为广大用户提供了丰富的数据源。这种基于用户的自发地理信息(VGI)受到其数据采集、表达等特点的限制,其数据质量严重影响其进一步地应用。以VGI中较成功的案例——Open Street Map(OSM)为例,对其路网数据质量和应用进行评价。首先从OSM数据的特点出发,给出了数据长度完整性和道路名称属性完整性2个定量质量要素的描述方法;其次选取国内外大、中、小4个城市做为实验区,与Baidu地图、Google地图的路网数据从长度和道路名称属性完整性进行比较、分析;最终通过实验结果表明,与Baidu地图相比,OSM的路网数据完整性和现势性在国内的3个城市整体上相当,但在国外具有较明显的优势,如果对其做进一步的处理,可以作为Baidu地图在海外电子地图的路网数据,进一步提高其应用价值。
