1. A programmed computer system for removing artifacts from aerial images of a region of interest, including: a memory for storing program instructions that are executable by a processor; a processor configured to execute the stored program instructions in order to: receive two or more input aerial images of the region of interest that are obtained at different times; create a false-color image by applying the two or more aerial images to different color channels; identifying artifacts in the two or more input aerial images based on the color of the pixels in the false-color image; and creating an artifact-free output image of the region of interest by combining pixels representing clear areas in the two or more input aerial images.