1. A method of determining candidate white space channels for use by a white space device (WSD), the method comprising: obtaining sensing results from the WSD, the sensing results including information regarding detection of channel signals by the WSD; determining one or more coarse high probability geographic areas (HPAs) for the WSD using at least a portion of the sensing results; refining the determined one or more coarse HPAs using at least an additional portion of the sensing results to thereby provide one or more refined HPAs; determining availability probabilities of white space channels within the refined one or more HPAs; and selecting one or more white space channels as the candidate white space channels for use by the WSD based at least in part on the determined white space channel availability probabilities.