Land and Aerial Surveying
Clean Harbors' methods of line layout and surveying in forested areas take advantage of GPS for positioning on all aspects of a land and aerial surveying project. With the use of GPS technology, we preprogram positional data; and with the use of differential GPS techniques, we lay out a seismic program as was intended by the seismic program designer. Clean Harbors employs GPS units with much higher degrees of accuracy to locate the exact ground position required. GPS land surveying under the tree canopy is accurate on the horizontal plane and can be accomplished in a short time span.
Light Detection and Ranging (Lidar) Survey Techniques
To gain a reliable vertical component on the survey, longer occupation times are required. By using Lidar survey techniques, we limit the time required to gain a survey position on the ground and can cover larger distances during the day, which allows us to work with a smaller, more efficient crew.
Lidar uses a scanning laser mounted on an aircraft, and coupled with GPS and an inertial measurement unit, creates a Digital Elevation Model (DEM) of the project area. The DEM can be produced with all culture left on for field mapping or, as in the final product, a bare earth model of the project area. We can then extract the vertical information for the survey points on the project.