1. A non-transitory computer-readable medium having stored contents that configure one or more computing devices to perform a method, the method comprising: acquiring a plurality of images of an exterior of a pile of material in an outdoors environment, based on a mobile device with image acquisition capabilities moving around the exterior while the plurality of images are being acquired by the mobile device; selecting, by the one or more configured computing devices, a group of multiple images of the plurality for use in representing the exterior of the pile, wherein the selecting includes excluding, by the one or more configured computing devices, one or more images of the plurality from the group based at least in part on overlap in the exterior included in the one or more images and in the multiple images of the group; analyzing, by the one or more configured computing devices, the multiple images of the group to generate a three-dimensional computer representation of the exterior of the pile, the analyzing including identifying portions of at least some of the multiple images that correspond to some of the outdoors environment separate from the exterior of the pile, and further including excluding the identified portions from data used for the generated three-dimensional computer representation; determining, by the one or more configured computing devices, a volume of the pile based on the generated three-dimensional computer representation; and providing, by the one or more configured computing devices, information about the determined volume.