Section 9: Extracting a Shoreline from Lidar Data.

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Presentation transcript:

Section 9: Extracting a Shoreline from Lidar Data

Historical Aerial Photography ( Provides Historical Shoreline Positions) 1930’s to 1990’s - Vertical Aerial Photographs

Shoreline Interpretation on Photography ( Wet/Dry Line) Gulf of Mexico Matagorda Bay

MHHW+0.6 m msl Geotube Landward boundary BEG-02 Beach profile QAd496Gibeaut_CCC_Jan31_2002 Lidar Digital Elevation Model (1 - m Grid) Ellipsoidal heights converted to orthometric heights (NAVD 88) using GEOID99 gravity model. Local mean sea level (MSL) correction applied.

Lidar Survey Video

Galveston Beach Wet/Dry Line

Intensity Draped on Topography

Galveston Island Profile

Representative Wet/Dry Elevation 0.6 m along Upper Tx Gulf Coast MHHW Height relative to MSL (m) Distance (m) 50 upper berm crest vegetation line

Why Use a Wet/Dry Elevation? Consistent with historical photography. Consistent with 2d ground GPS surveys. Lidar can measure reliably even during elevated water levels. Geomorphologically significant elevation not as susceptible to short-term erosion/depositional cycles compared to lower elevations.

Hand-Smoothed Shoreline