We fly the Sony RX100. It produces remarkably sharp 20 megapixel photographs with DSLR quality. We started out with a GoPro. GoPros are good action cameras, but all of their lenses are wide angle which results in a "fisheye" effect on the photograph where the viewer will actually see a curvature to the horizon. This is not desirable when you're hoping to get a "real estate" quality photograph. All of your photographs will be 5742 x 3080 pixels with no fisheye effect, and will surpass the minimum resolutions required for poster-sized printing.