Differential GPS

What is Differential GPS?

A Global Positioning System (GPS) reads impulses from satellites orbiting Earth in order to pinpoint one's location.  Because of the altitude of satellites orbiting Earth, atmospheric disturbances of the signals ("static"), and the general complexity of the system, a normal GPS has a given range of error, defined as P-Dop.  A Differential-GPS (D-GPS) uses signals from more satellites, and configures the signals to generate a better P-Dop.  The result of the D-GPS is the ability to resolve one's position to within a fraction of a meter in any direction.

Ross records the location of a Ground Penetrating Radar transect.  The D-GPS team recorded the location and geometric shape of the beach, location of beach facilities, and positions of GPR sites.

Why collect D-GPS data at Hapuna Beach?

Through the use of a D-GPS, we can, with great accuracy, map the beach vicinity.  The information gathered concerning the beach surface (laser leveling),  material structure of the beach (GPR), and biotic relations (biogeography) can then be integrated into a Geographic Information System.

Mark, Ross, and Patrick walk and record the perimeter of the beach

GPS, GPR, Laser Leveling, Biogeography, Luau, Return to Hapuna Beach Contents