网络地图用户访问会话时空特征分析

Spatio-Temporal Characteristics of WMTS Access Sessions

【目的】探究会话尺度下群体用户对WMTS访问的时空统计特征。【方法】对用户访问会话进行识别并设计有效算法提取用户访问目标。从日访问会话数、会话请求数、会话时长、瓦片访问速度4个维度,深入探究用户访问的时间属性分布特征;从省份、城市及距离三个维度,探究用户所在地与访问目标之间的空间关系。【结果】WMTS访问行为具有幂律特征,大多数用户的访问简洁高效,有明确访问需求;信息化建设程度高的省份,其用户访问更为集中和深入;在访问内容的空间分布上,以同省、同城访问为主,约30%的访问目标集中于用户所在城市中心点43千米范围内。【局限】研究对象为访问WMTS频次较多的用户,普适性有待验证。【结论】从会话尺度描述WMTS访问会话特征,有利于深入理解用户地理信息需求的时空分布特征。

[Objective] This paper explores the spatio-temporal statistical characteristics of users’ visits to Web Map Tile Service(WMTS).[Methods] First,we identified the WMTS sessions and extracted the targets based on an efficient algorithm.Then,we studied the temporal features of user access sessions with daily session numbers,requests and duration of each session,as well as assess speed per tile.For spatial characteristics,we described the relationship between users’ locations and their access targets,such as provinces,cities,and distances.[Results] The users’ WMTS sessions possessed power-law distribution,and most of them were brief and efficient with clear objectives.Users from provinces with better information infrastructure tended to have more centralized and deeper WMTS sessions.Most of the WMTS sessions searched for targets within the same province or city,while 30% of the targets were within 43 km of the users’ city centers.[Limitations] The data was collected from users who access WMTS frequently,which needs to be expanded.[Conclusions] Describing users’ access characteristics from session granularity,helps us understand users’ geographical information needs.