Homer Spit Beach Condition Surveys Homer, Alaska

We collected data using a Trimble GPS base and receiver with HYPACK software, and a gyro-stabilized digital compass and computer system mounted on a Honda All Terrain Vehicle (ATV). This ATV system was able to provide the positioning and topographic data collection in RTK mode, on corrections broadcast from a local base station.

The attitude of the vehicle was measured by digital compass. Data was processed with HYPACK & HYSWEEP and the points output were corrected for pitch and roll.

Data were collected running lines parallel with the beach and spaced no more than 100' apart, from the toe of the highway berm and past the Mean Lower Low Water (MLLW) line. Cross lines were run on 21 existing profiles from the road out to MLLW. Only ground topography was collected, no revetment or man-made structures were surveyed. Point files were provided to the USACE in a format compatible with AutoCAD/Softdesk.

Vertical control was based on existing USACE monuments. All temporary and permanent vertical control was tied to the primary USACE vertical control according to specification accuracy requirements.

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