Data trustworthiness and user reputation as indicators of VGI quality

Figures & data

Figure 1. OSM provenance ontology diagram.

Figure 2. Versioning establishes a temporal ordering on feature states.

Figure 3. Wordnet graph example.

Figure 4. Geometric comparison between versions.

Figure 5. A small geometric change may correspond to a qualitative spatial change.

Figure 6. Conceptual neighborhood graph of topological relations, as defined in 9–Intersection model.

Figure 7. Versions that determine indirect effect.

Figure 8. Temporal effect contribution on trustworthiness.

Figure 9. Graphic explanation of the composition of trustworthiness (reputation looks identical).

Figure 10. Domain ontology: HVGI.

Figure 11. Domain ontology: trustworthiness and reputation.

Figure 12. The TandR framework: component diagram.

Figure 13. Wien ground truth data-set from open government Wien.

Figure 14. Screenshot of the selected area in OSM.

Figure 15. Trustworthiness values for the OSM feature 32506491 varying over edits and feature versions.

Table 1. Validation indexes for feature id 38838966.

Version Number	Trustworthiness	Similarity
3.0	0.1179	0.4166
4.0	0.6138	0.3888
5.0	0.4462	0.3888
6.0	0.4874	0.3888

Table 2. Validation indexes for feature id 45275690.

Version Number	Trustworthiness	Similarity
3.0	0.5065	0.3749
3.1	0.4419	0.3749

Figure 16. Two versions of feature 38838966 superimposed on the ground truth data-set.

Figure 17. Two versions of feature 45275690 superimposed on the ground truth data-set.