Airborne Laser Swath Mapping of Gal Veston Island and Bolivar Peninsula, Texas

摘要

In November 1997 The University of Texas at Austin and Optech surveyed Galveston Island and Bolivar Peninsula o nthe Texas Gulf Coast using an airborne laser swath mapping system, the Optech ALTM-1020. With the ALTM-1020 installed in a small aircraft we mapped more than 163 km~2 in one day with a laser ground point spacing of 2 to 6m. We merged laser data from multiple flightlines to create a high-resolution digital terrain model (DTM).Vegetation and cultural features are clearly discernible in the DTM. Gemorphic features identificable in the DTM include the shoreline, beach and foredunes, a series of accretionary spits, beach ridges, and small tidal creeks. Comprisons with ground surveys indicate that the laser DTM matches ground truth in all significant details and measures topography with a precision of about 0.15m.