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Geosciences 2017, 7(3), 62; doi:10.3390/geosciences7030062

A Method for Correcting Tidal Effect on Shoreline Position Extracted from an Image with Unknown Capture Time

1
Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
2
Division of Civil Engineering, Thuyloi University - Southern Campus, 717000 Ho Chi Minh, Vietnam
3
Department of Civil and Environmental Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan
*
Author to whom correspondence should be addressed.
Received: 24 May 2017 / Revised: 19 July 2017 / Accepted: 21 July 2017 / Published: 24 July 2017
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Abstract

It is inevitable to find in studies that shoreline position extracted from unknown capture time aerial photograph or satellite image was not corrected to tidal effect. In this study, an approach is introduced that can estimate the capture time of image from the solar azimuth angle and the length of shadow of a vertical object on the horizontal surface on the earth. The capture time of tze aerial photograph estimated from solar azimuth angle has a much smaller deviation than the one estimated from the length of the shadow. This error is acceptable for tidal correction purposes. The approach was also utilized to estimate the capture time of a set of satellite images on Sendai coast. Therefore, the tidal correction was implemented for shoreline positions extracted from those images. View Full-Text
Keywords: tidal correction; solar azimuth angle; shoreline position; Google Earth; capture time tidal correction; solar azimuth angle; shoreline position; Google Earth; capture time
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hoang, V.C.; Tanaka, H.; Mitobe, Y. A Method for Correcting Tidal Effect on Shoreline Position Extracted from an Image with Unknown Capture Time. Geosciences 2017, 7, 62.

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