Comparison of Sentinel-2 imagery with Landsat8 imagery for surface water extraction using four common water indexes

doi:10.6046/gtzyyg.2019.03.20

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Abstract

Extracting surface water like lake water areas from satellite images quickly and accurately has been an important research topic, which is of great significance to the water disaster monitoring and water resource management. Sentinel-2 multi spectral imager (MSI) and Landsat8 operational land imager (OLI) data are two popular medium- to high- resolution data sources that are freely available. Using the Poyang Lake as the study area and employing four popular water indices, i.e., normalized difference water index (NDWI), modified normalized difference water index (MNDWI), automatic water extraction index (AWEI_sh) and water index created with linear discriminant analysis (WI₂₀₁₅), the authors extracted water distribution from two types of images respectively. Water extraction results derived from different images and different water indices were analyzed. The accuracy of the water extraction results was evaluated by visual interpretation results of corresponding GF-1 images. The results reveal that, for these two remote sensing images, all water indices can detect most water body successfully. Among these indices, AWEI_sh and WI₂₀₁₅ have relatively higher extraction accuracy, reaching 98% and 94% respectively on Sentinel-2 and Landsat8 images. Compared with Landsat8 images, Sentinel-2 images are capable of reflecting more detailed water body information, and the overall extraction accuracy is higher.

Keywords Sentinel-2 Landsat8 NDWI MNDWI AWEI_sh WI₂₀₁₅

TP79

Corresponding Authors: Chang HUANG E-mail: changh@nwu.edu.cn

Issue Date: 30 August 2019

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	Dazhao WANG
	Simeng WANG
	Chang HUANG

Cite this article:

Dazhao WANG,Simeng WANG,Chang HUANG. Comparison of Sentinel-2 imagery with Landsat8 imagery for surface water extraction using four common water indexes[J]. Remote Sensing for Land & Resources, 2019, 31(3): 157-165.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2019.03.20 OR https://www.gtzyyg.com/EN/Y2019/V31/I3/157

Fig.1 Landsat8 composite image of Poyang Lake with B5(R),B4(G),B3(B)

Fig.2 Comparison of reflectance of six corresponding bands between Landsat8 and Sentinel-2

Fig.3 Water index images of Landsat8 and Sentinel-2

Fig.4 Water distribution derived from Landsat8 and Sentinel-2 using 0 as the threshold

Fig.5 Water distribution derived from Landsat8 and Sentinel-2 using customized threshold

Fig.6 Overlapping maps of water distribution of Landsat8 and Sentinel-2

Tab.1 Superimposed image percentage of various types of pixels(%)

Fig.7 Overlapping maps of four water indices from Landsat8 and Sentinel-2

Tab.2 Statistics of superimposed pixel number for four indices from Landsat8 and Sentinel-2 (%)

Tab.3 Accuracy evaluation of four water extraction results based on Landsat8 and Sentinel-2 images using four water indices

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