MAPPING NEAR SHORE BATHYMETRY USING WAVE KINEMATICS IN A TIME SERIES OF WORLDVIEW-2 SATELLITE IMAGES Ron Abileah 2/25/2019.

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Presentation transcript:

MAPPING NEAR SHORE BATHYMETRY USING WAVE KINEMATICS IN A TIME SERIES OF WORLDVIEW-2 SATELLITE IMAGES Ron Abileah 2/25/2019

WorldView 2 Image Sequence 2/25/2019 IGARSS 2013 Melbourne

WorldView 2 WKB 2/25/2019 IGARSS 2013 Melbourne

WorldView 2 WKB OSU Jetski 2/25/2019 IGARSS 2013 Melbourne

Depth Estimation Objective Function J – Evaluated pixel-by-pixel Image 1, propagated forward τ/2 seconds, at depth z Image 2, propagated backward τ/2 seconds, at depth z 2/25/2019 IGARSS 2013 Melbourne

Objective Function – averaged over area A Noise averaging over area A (e.g., 100m x 100m) 2/25/2019 IGARSS 2013 Melbourne

Objective Function – averaged over area A and all image pairs in set Noise averaging over area A and all image pairs in 2/25/2019 IGARSS 2013 Melbourne

Objective Function Minimization demonstrated with 1 image pair, A = 100m x 100m 2/25/2019 IGARSS 2013 Melbourne

A = 100 x 100 m 7 image pairs 2/25/2019 IGARSS 2013 Melbourne

A = 100 x 100 m 7 image pairs Truth + tide datum corrected regression 2/25/2019 IGARSS 2013 Melbourne

2/25/2019 IGARSS 2013 Melbourne

2/25/2019 IGARSS 2013 Melbourne

A = 100 x 100 m 7 image pairs 2/25/2019 IGARSS 2013 Melbourne

The ΔT Factor Depth averaged over distance that waves travel in time interval ΔT. In shallow water limit Wave refraction 2/25/2019 IGARSS 2013 Melbourne

Summary Depth mapping demonstrated at Agate Beach, OR ΔT = 10 s 7 image pairs Haze Depth accuracy +1m with 100 m resolution ≤50 m resolution achievable at shallower depths Possibility for greater depth mapping accuracy ΔT = 7 s with WV02 Up to 40 image pairs Better visibility WBK method works in turbid waters 2/25/2019 IGARSS 2013 Melbourne

Acknowledgements Satellite imagery provided by Digital Globe under a data exchange agreement DigitalGlobe's Gregory Miecznik, Dan Lester, and Chuck Chaapel provided much technical assistance throughout this study Jet ski survey funded by Oregon's Department of Geology and Mineral Industries (DOGAMI) and The Northwest Association of Networked Ocean Observing Systems (NANOOS) Peter Ruggiero, Oregon State University, provided the 2012 jet ski survey data 2/25/2019 IGARSS 2013 Melbourne

Thank you Ron Abileah abileah@jOmegak.com 2/25/2019 IGARSS 2013 Melbourne

Appendix A Waimanlo Beach 2/25/2019 IGARSS 2013 Melbourne

WKB vs. SHOALS depths 2/25/2019 IGARSS 2013 Melbourne

2/25/2019 IGARSS 2013 Melbourne

2/25/2019 IGARSS 2013 Melbourne

Appendix B Coronado Beach 2/25/2019 IGARSS 2013 Melbourne

WK Current 2/25/2019 IGARSS 2013 Melbourne Before depth can be estimated, WK estimates the ocean surface current. The color scale is Red -1 m/s Green 0 m/s Blue +1 m/s Positive x is to the right; positive y is up. Note strong outward jet at the San Diego Bay inlet. IKONOS image by SpaceImaging. 2/25/2019 IGARSS 2013 Melbourne

WK Bathymetry 2/25/2019 IGARSS 2013 Melbourne WK depths are average values over the area of a tile, 150m x 150m. The color scale is Dark red 5m Dark blue 25m Blank tiles are areas where depth could not be estimated reliably. IKONOS image by SpaceImaging. 2/25/2019 IGARSS 2013 Melbourne

San Diego bathymetry with IKONOS 2/25/2019 IGARSS 2013 Melbourne

Appendix C WKB objective function in deep water 2/25/2019 IGARSS 2013 Melbourne

2/25/2019 IGARSS 2013 Melbourne

Appendix D Agate Beach with 1 image pair, 200m x 200 m 2/25/2019 IGARSS 2013 Melbourne

A = 200 x 200 m 1 image pair 2/25/2019 IGARSS 2013 Melbourne

A = 200 x 200 m 1 image pair 2/25/2019 IGARSS 2013 Melbourne

OSU Jet Ski Survey Transects 2/25/2019 IGARSS 2013 Melbourne