An imaging system includes an offset focal array including a plurality of photosensitive elements disposed at different focal lengths from at least one lens to output an image simulating an orthogonal view of an oblique coverage area. A formula is associated with one or more selected elements in the report to generate a result for the one or more selected elements. In one embodiment, the cams move in rectilinear directions and have flat actuating surfaces engaged with flat actuating surfaces of the pawls, while another embodiment has the cams moved in curved paths and having curved actuating surfaces slidably engaged with curved actuating surfaces of the pawls.