Oct 8th. 1999

Brian Junck and Harry Jol take GPR readings of a large sand dune located in the Carson Sink area.

Summary of Ground Penetrating Radar:

Ground penetrating radar (GPR) is a relatively new method of interpreting stratigraphic sequences and profiles. The GPR process involves shooting electromagnetic energy (radar) into a section of ground being studied using portable dipole transmitting antennae which are placed at ground level over the site. The radar waves are sent into the ground and portions of this energy is reflected back upwards to a receiving antennae and is then processed using appropriate software within a computer to create a side profile of the sedimentary layers. Profiles can then be analyzed to determine stratigraphic content and boundaries, water table elevations, and the presence of archaeological items. GPR has been proven to be an effective means of accomplishing these tasks.

Laser Leveling Equipment:

Laser leveling allows topographic profiles of an area to be mapped quickly and accurately with a laser. A base unit transmits a laser beam in a 360 degree circle from the base to a range of about 1500 meters. A large pole with measurment markings on it is used in correlation with a receiver that slides on the pole. The reciever is slid up or down the pole until it locks directly onto the laser beam and and emits a constant beep. The height is then measured off of the pole based on the position of the receiver.

This unit emits a laser in 360 degrees.