Table of Contents
ISPRS Int. J. Geo-Inf., Volume 5, Issue 12 (December 2016)
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Cover Story (view full-size image) The causes of VGI imprecision and uncertainty in citizen science projects are investigated [...] Read more. The causes of VGI imprecision and uncertainty in citizen science projects are investigated supported by an experience within a case study in agriculture: “contextualized VGI” about in situ observations of crops is created by means of a smart app that aids volunteers by providing both their viewpoint direction and an agronomic ontology. Furthermore, fuzzy domain ontologies are proposed for creating VGI in the cases of ill-defined domain knowledge; and level-based approximate reasoning is suggested for allowing VGI consumers to filter VGI that satisfies their quality needs.