基于用户信誉的自发地理信息可信度计算模型

Computing Model of Volunteered Geographic Information Trustworthiness Based on User Reputation

自发地理信息(volunteered geographic information,VGI)由大众志愿者自发标报,导致其可信度具有诸多不确定性,但目前的研究工作很少考虑用户信誉对于VGI质量的影响,因此提出基于用户信誉的VGI可信度计算模型。首先提出了VGI的用户信誉模型,模型综合考虑了用户的初始信誉和评价信誉两方面,在此基础上综合地理要素的编辑过程和贡献者的信誉等因素发展了地理对象的可信度计算模型。最后采用OpenStreetMap的真实历史数据中的线对象进行实验,实验结果表明,线要素的质量和可信度值呈正相关关系。本文从可信度的角度来评价自发地理信息,为VGI的质量评价和筛选提供了新的视角。

Volunteered geographic information（VGI）is a new kind of geospatial data collected by nonprofessional volunteers,and it will lead to uncertainty of its credibility.At present,little research works focuses on VGI quality according to its contributor＇s reputation.This paper proposes integrating user reputation with VGI trustworthiness.A user reputation model is put up at first,which aggregates initial reputation and experience reputation of contributor.Then,a computing model of VGI trustworthiness is developed,which take factors such as the editing process of geographic feature,reputation of contributors and so on into consideration.At last,historical polyline data from OpenStreetMap is employed for experiments.The experimental results demonstrate that the quality of polyline features has high positive correlation with its trustworthiness.In this paper,VGI is assessed by means of its trustworthiness,which offers a fresh perspective for evaluating and screening VGI.