A DVG survey created 100m and 300m interval of true ground spot heights, which was used by the Aerial Photogrammetry surveyor to enhance their contours. A much more accurate contour of the true ground was produced than if conventional aerial photogrammetry was used, thus the ground checking that usually takes months was eliminated.

This is an extension of the previous project which was done in November to December 1999. From the data submitted earlier, authorities concluded that more area needed to be studied. A DVG survey created 100m and 300m interval of profiling true ground spot heights and result was given to Aerial Photogrammetry surveyor to enhance their contour and to eliminate months of ground checking.