A computerized system including a computer system running image display and analysis software is described. The computer system displays an oblique image, references positional data for the oblique image, creates a ground plane for the oblique image, receives a selection of at least two pixels within the oblique image and calculates a desired measurement using the selection of the at least two pixels and the ground plane, the desired measurement taking into account changes within the topography of the area captured within the oblique image.