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Ground Failure

LIDAR Imagery of the San Andreas Fault zone at the Vedanta and Olema Ridge Paleoseismic Trench sites, Pt. Reyes, CA

Index Back to Geotech Home Page About These Web Pages Summary Olema Ridge Trench Color Channel & Intensity Models of the Trench Wall Vedanta Ranch Trench Abstract

Vedanta Ranch Trench

Photo of Riegl Z210i  tripod-mounted LiDAR. Plan view of the trench
Photo of lidar scanner at the Olema Ridge trench

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Field Methods: We used the Riegl Z210i tripod-mounted LiDAR system of the Geo-Engineering Laboratory of the USGS Coastal and Marine Team at Vedanta Ranch at Olema Hill. Here, the LiDAR is set up inside the trench to image the exposed fault. The unit weighs 13 kg, is rugged, and highly portable. The upper right image is a LiDAR plan view of the trench. The circular nadir is the set up location of the tripod. At these distances we can resolve features to <1cm, such that trench walk planks, tools, and pump hoses are clearly visible in the image.

LiDAR — View to East LiDAR — View to North
LiDAR — View to West Data Rotation: LiDAR data can be scaled and rotated in all directions allowing us to visualize the trench and fault in ways not possible in the field. These three images show point cloud rotations from east-looking to west-looking.

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3 views of the north wall of trench D.Click on image for larger view (54-99KB)
Traditional photo interpretation of the trench wall.


Abstract | Vedanta Ranch Trench | Color Channel & Intensity Models of the Trench Wall | Olema Ridge Trench
Summary | About These Web Pages | Geotech Home Page

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maintained by Diane Minasian
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last modified 13 April 2005

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