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Wednesday, April 26 • 12:30pm - 2:00pm
Evaluating The Time Efficiency Of Using Structure-From-Motion Methods To Generate Digital Elevation Models For Use In Strike-Slip Fault Offset Studies

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Light detection and Ranging (LiDAR) is valuable for geologic studies due to its ability to detect sub-meter scale geomorphic features remotely. However, the high cost of air-based systems and the time required to operate ground-based terrestrial laser scanners (TLS) can limit efficiency when utilized for certain fault offset studies. Structure-from-Motion (SfM) can generate high-resolution digital elevation models (DEMs) using photographs and is becoming increasingly explored due to its cheaper cost. The time-consuming tasks with SfM primarily involve collecting aerial photographs and GPS ground control points (GCPs). To maximize time-efficiency with SfM, this study addresses the minimum quantity and quality of GPS GCPs required to achieve LiDAR accuracy. These questions were tested by comparing airborne LiDAR and SfM generated DEMs along the dextral Benton Springs fault in western NV. The SfM DEMs utilized aerial photographs obtained from a Cessna flying at ~300 meters. This methodology required minimal time and resulted in 0.2 m per pixel DEM resolution. Four DEMs of the same area were generated with SfM utilizing: (1) 10 high-accuracy GPS GCPs, (2) five high-accuracy GPS GCPs, (3) 10 handheld GPS GCPs, and (4) 5 handheld GPS GCPs. The two high-accuracy GPS GCP DEMs had minor elevation differences compared to airborne LiDAR, however, the two handheld GPS GCP DEMs had significant differences. Horizontal errors were assessed by comparing dextral fault offsets of SfM DEMs to airborne LiDAR DEMs. These ranged from ~4 to 33 m. Both 10 GCP SfM DEMs had percent errors


Wednesday April 26, 2017 12:30pm - 2:00pm PDT
Concourse - Wilma Sherrill Center

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