WorldView 2 Image Sequence

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MAPPING NEAR SHORE BATHYMETRY USING WAVE KINEMATICS IN A TIME SERIES OF WORLDVIEW-2 SATELLITE IMAGES Ron Abileah. WorldView 2 Image Sequence. WorldView 2. WKB. WorldView 2. WKB. OSU Jetski. Depth Estimation Objective Function J – Evaluated pixel-by-pixel. - PowerPoint PPT Presentation

Transcript of WorldView 2 Image Sequence

  • MAPPING NEAR SHORE BATHYMETRY USING WAVE KINEMATICS IN A TIME SERIES OF WORLDVIEW-2 SATELLITE IMAGES

    Ron Abileah

  • WorldView 2 Image Sequence

  • WKBWorldView 2

  • WKBWorldView 2 OSU Jetski

  • Depth Estimation Objective Function J Evaluated pixel-by-pixel Image 1, propagated forward /2 seconds, at depth zImage 2, propagated backward /2 seconds, at depth z

  • Noise averaging over area A (e.g., 100m x 100m)Objective Function averaged over area A

  • Noise averaging over area A and all image pairs in Objective Function averaged over area A and all image pairs in set

  • Objective Function Minimization demonstrated with 1 image pair, A = 100m x 100m

  • A = 100 x 100 m7 image pairs

  • A = 100 x 100 m7 image pairs

    Truth + tide datum corrected regression

  • A = 100 x 100 m7 image pairs

  • The T Factor

    Depth averaged over distance that waves travel in time interval T. In shallow water limit

    Wave refraction

  • SummaryDepth mapping demonstrated at Agate Beach, ORT = 10 s7 image pairsHazeDepth accuracy +1m with 100 m resolution 50 m resolution achievable at shallower depths

    Possibility for greater depth mapping accuracyT = 7 s with WV02 Up to 40 image pairsBetter visibility

    WBK method works in turbid waters

  • AcknowledgementsSatellite 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

  • Thank you

    Ron Abileahabileah@jOmegak.com

  • Appendix A Waimanlo Beach

  • WKB vs. SHOALS depths

  • Appendix B Coronado Beach

  • WK CurrentBefore depth can be estimated, WK estimates the ocean surface current. The color scale is

    Red -1 m/s Green 0 m/sBlue +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.

  • WK BathymetryIKONOS image by SpaceImaging.WK depths are average values over the area of a tile, 150m x 150m. The color scale is Dark red 5mDark blue 25m

    Blank tiles are areas where depth could not be estimated reliably.

  • San Diego bathymetry with IKONOS

  • Appendix C WKB objective function in deep water

  • Appendix DAgate Beach with 1 image pair, 200m x 200 m

  • A = 200 x 200 m1 image pair

  • A = 200 x 200 m1 image pair

  • OSU Jet Ski Survey Transects