1. A machine control system, comprising: a machine mounted stereo imaging apparatus configured to provide a 3-D model indicative of an area of a job site, the area being in view of the stereo imaging apparatus; and a control module configured to: determine a geographic location of the area; and incorporate the 3-D model into a location in a 3-D map of the job site based on the geographic location of the area, the 3-D map of the job site covering the area and one or more other areas of the job site outside the view of the stereo imaging apparatus.