Voluntary Geographic Information: how to establish and evaluate its quality?
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Abstract
A new trend has appeared in the field of cartography production: volunteered geo- graphic information or VGI. Currently, anyone can produce/share/use geographic information with web-based tools such as OpenStreetMap. The professional environment worries about the quality of these data. Analyzing data accuracy is the most important question. VGI considers that the same data collected by many people has a better result than data collected by different individuals. Some former research worNs determine a comparison between the accuracy of linear and point features collected with VGI and data from official sources. Nevertheless, in many cases there is no possibility to access reliable data sources. How can the quality of voluntary information be quantified? And how to use VGI, thus taNing advantage of free data? In this paper of the state of the art about IGV possible answers are pre- sented through the most relevant aspects of this Nind of voluntary contributions. Furthermore, methodologies and solutions are shown in several studies to establish a quality assessment procedure. An especially important issue for professionals is to distinguish when and how to use the VGI. Thus, taNe advantage of free data collec- tion without forgetting the accuracy of the information.
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