ASSESSING THE RELIABILITY OF CONTRIBUTORS IN VGI USING IMPLICIT FACTORS

Abstract. VGI projects include geographic information, which are the product of many unorganized volunteers, making it a challenge to ensure quality their information. In this field study, several researchers have suggested using intrinsic factors evaluate instead explicit methods such as comparing with real or reference datasets. addition, measurement reliability contributors an essential factor in determining credibility contributions remains open question. Various types contributors’ activities and interactions introduced discussed detail study at first. Then comprehensive spatio-temporal contributor model is proposed assess performance based on multiple implicit between volunteers contribution process. Finally, cities different rate (based population, number users area extent) chosen applied data selected regions, finally results compared discussed.