 Volunteered Geographic Information, VGI, is a subset of crowdsourced data, CSD, which has recently increased in popularity and is used in disaster management, but quality issues such as credibility, reliability, and relevance limit its advantages. A naive Bayesian network approach based on spam email detection systems was used to assess the credibility of the Australian Broadcasting Corporation's Usher Heidi crowd map dataset during the 2011 Australian floods, resulting in an accuracy of over 90% using a forced classification methodology. This article was authored by Salman Kosswat, Kevin McDougal, and Shia Yehlu.