When it comes to surveying, the leg work is the most time consuming part. SEI can map an area in a fraction of the time it takes a traditional crew. The data collected is more accurate because thousands of reference points are taken each flight, as opposed to the handful, a manual crew can generate. Once the 3D, Topographic, Planimetric, or Volumetric map is created it can be incorporated directly into your engineering software avoiding the need for manual data entry.  This cuts overhead cost, and allows you to focus on completing the project without ever leaving your desk.