Journal
REMOTE SENSING
Volume 5, Issue 11, Pages 6138-6158Publisher
MDPI
DOI: 10.3390/rs5116138
Keywords
tidal flats; coastal morphology; digital elevation model; the waterline method
Categories
Funding
- National Natural Science Foundation of China [41171325, 41230751, J1103408]
- Program for New Century Excellent Talents in University [NCET-12-0264]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
- National Key Project of Scientific and Technical Supporting Programs
- Ministry of Science and Technology of China [2012BAH28B02]
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Although the topography of tidal flats is important for understanding their evolution, the spatial and temporal sampling frequency of such data remains limited. The waterline method has the potential to retrieve past tidal flat topography by utilizing large archives of satellite images. This study performs a quantitative analysis of the relationship between the accuracy of tidal flat digital elevation models (DEMs) that are based on the waterline method and the factors that influence the DEMs. The three major conclusions of the study are as follows: (1) the coverage rate of the waterline points and the number of satellite images used to create the DEM are highly linearly correlated with the error of the resultant DEMs, and the former is more significant in indicating the accuracy of the resultant DEMs than the latter; (2) both the area and the slope of the tidal flats are linearly correlated with the error of the resultant DEMs; and (3) the availability analysis of the archived satellite images indicates that the waterline method can retrieve tidal flat terrains from the past forty years. The upper limit of the temporal resolution of the tidal flat DEM can be refined to within one year since 1993, to half a year since 2004 and to three months since 2009.
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