Rapid flood inundation mapping by differencing water indices from pre- and post-flood Landsat images

doi:10.1007/s11707-020-0818-0

Front. Earth Sci.

2021, Vol. 15

Issue (1) : 1-11 https://doi.org/10.1007/s11707-020-0818-0

RESEARCH ARTICLE

Rapid flood inundation mapping by differencing water indices from pre- and post-flood Landsat images

Ramesh SIVANPILLAI¹(

), Kevin M. JACOBS^2,³, Chloe M. MATTILIO⁴, Ela V. PISKORSKI²

¹. Wyoming Geographic Information Science Center, University of Wyoming, Laramie, WY 82071, USA
². Department of Ecosystem Science & Management, University of Wyoming, Laramie, WY 82071, USA
³. Haub School of Environment & Natural Resources, University of Wyoming, Laramie, WY 82071, USA
⁴. Department of Plant Sciences, University of Wyoming, Laramie, WY 82071, USA

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Abstract

Following flooding disasters, satellite images provide valuable information required for generating flood inundation maps. Multispectral or optical imagery can be used for generating flood maps when the inundated areas are not covered by clouds. We propose a rapid mapping method for identifying inundated areas based on the increase in the water index value between the pre- and post-flood satellite images. Values of the Normalized Difference Water Index (NDWI) and Modified NDWI (MNDWI) will be higher in the post-flood image for flooded areas compared to the pre-flood image. Based on a threshold value, pixels corresponding to the flooded areas can be separated from non-flooded areas. Inundation maps derived from differencing MNDWI values accurately captured the flooded areas. However the output image will be influenced by the choice of the pre-flood image, hence analysts have to avoid selecting pre-flood images acquired in drought or earlier flood years. Also the inundation maps generated using this method have to be overlaid on the post-flood satellite image in order to orient personnel to landscape features. Advantages of the proposed technique are that flood impacted areas can be identified rapidly, and that the pre-existing water bodies can be excluded from the inundation maps. Using pairs of other satellite data, several maps can be generated within a single flood which would enable emergency response agencies to focus on newly flooded areas.

Keywords Rapid Flood Mapping (RFM) inundation maps Satellite data NDWI MNDWI

Corresponding Author(s): Ramesh SIVANPILLAI

Online First Date: 23 April 2020 Issue Date: 19 April 2021

Cite this article:

Ramesh SIVANPILLAI,Kevin M. JACOBS,Chloe M. MATTILIO, et al. Rapid flood inundation mapping by differencing water indices from pre- and post-flood Landsat images[J]. Front. Earth Sci., 2021, 15(1): 1-11.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-020-0818-0
https://academic.hep.com.cn/fesci/EN/Y2021/V15/I1/1

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