Vol.18No.2Marine Science Bulletin Oct.2016 A cond modified normalized difference water index (SMNDWI)in the ca of extracting the shoreline
LI Ming,ZHENG Xiao-shen*
Tianjin Key Laboratory of Marine Resources and Chemistry,College of Marine and Environmental Science,Tianjin Marine Environmental Protection and Restoration Technology Engineening Center, Tianjin University of Science and Technology,Tianjin300457,China
Abstract:Due to the fast development of industrialization and urbanization,shoreline
extraction is necessary for the sustainable development and environment protection in
我毕业了many countries.This study focud on the accurate methods of extracting the
穷凶极恶的意思instantaneous waterline—shoreline obtained as the same instant as the satellite image
保密法学习心得is acquired.Bad on NDWI(Normalized Difference Water Index)and MNDWI
(Modified Normalized Difference Water Index),the study changed the band
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shape
combination and propod a cond modified normalized water index(SMNDWI)to
玛莉亚女子医院extract the waterline.And,this new index is applied to three types of coast to evaluate
the performance of this method with traditional ones.Results show that SNDWI is
better than NDWI and suitable for applying to the waterline extraction.手工发饰
钢琴指法入门图
Keywords:shoreline,normalized difference water index,Landsat
1Introduction
A shoreline is defined as the physical interface of land and a(Dolan et al.,1991; Gens,2010).The changes of the shoreline position are mainly caud by two factors:(i)natural activities,such as asonal storms and catastrophic winds,near-shore waves and currents,a level ri and other astronomical and meteorological factors (Pugh,2004);and(ii)anthropogenic factors.In many countries,especially developing countries,most people live by the a.Human activities include near-shore engineering, construction of docks and dams,land reclamation and other socio-economic activities. Some natural incidences lead to short-term(usually less than one year)changes of the shoreline,such as a-level changes,indicating the magnitude of the variability over the cour of a y
ear and so enable coastal management authority to define and establish protected shore areas.On the other hand,the long-term(usually more than three year) changes caud by deposition and erosion as well as human activities reveal a definite
Received on Sep.12,2016
*Corresponding author:
