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政大典藏 > College of Social Science > Department of Land Economics > Periodical Articles > Item 140.119/140113

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/140113

Title:	Combining Spectral Water Indices and Mathematical Morphology to Evaluate Surface Water Extraction in Taiwan
Authors:	甯方璽 Ning, Fang-Shii Lee, Yu-Chan
Contributors:	地政系
Keywords:	remote sensing;spectral water index;mathematical morphology
Date:	2021-10
Issue Date:	2022-05-18 16:07:53 (UTC+8)
Abstract:	Rivers in Taiwan are characterised by steep slopes and high sediment concentrations. Moreover, with global climate change, the dynamics of channel meandering have become complicated and frequent. The primary task of river governance and disaster prevention is to analyse river changes. Spectral water indices are mostly used for surface water estimation, which separates the water from the background based on a threshold value, but it can be challenging in the case of environmental noise. Edge detection uses a canny edge detector and mathematical morphology for extracting geometrical features from the image and effective edge detection. This study combined spectral water indices and mathematical morphology to capture water bodies based on downloaded remote sensing images. From the findings, this study summarised the applicability of various spectral water body indices to the surface water extraction of different river channel patterns in Taiwan. The normalised difference water index and the modified normalised difference water index are suitable for braided rivers, whereas the automated water extraction index is ideal for meandering rivers.
Relation:	Water, 13(19), pp.2774
Data Type:	article
DOI link:	https://doi.org/10.3390/w13192774
Appears in Collections:	[Department of Land Economics] Periodical Articles

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