1. A method of providing a map for display comprising: determining, by one or more computing devices, whether a first image of a geographic location contains a feature having first image characteristics consistent with image characteristics of a person's shadow, the image being associated with a first time of day of a first calendar day, and the first image characteristics of a person's shadow being based at least in part on the first time of day; determining, by the one or more computing devices, whether a second image of the geographic location contains a feature having second image characteristics consistent with image characteristics of a person's shadow, the second image being associated with a second time of day of a second calendar day, the image characteristics of a person's shadow being based at least in part on the second time of day, and the second time of day and second calendar day being different from the first time of day and first calendar day, respectively; determining, by the one or more computing devices, the likelihood of the geographic location being publicly accessible based at least in part on whether the first and second image are both determined to contain image characteristics consistent with image characteristics of a person's shadow; generating, by one or more computing devices, a map of the geographic location and visual indicia, wherein the visual indicia is indicative of the determined likelihood of the geographic location being publicly accessible; and providing for display, by one or more computing devices, the map of the geographic location and the visual indicia.