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

作     者：Ramesh SIVANPILLAI Kevin M.JACOBS Chloe M.MATTILIO Ela V.PISKORSKI Ramesh SIVANPILLAI;Kevin M.JACOBS;Chloe M.MATTILIO;Ela V.PISKORSKI

作者机构：Wyoming Geographic Information Science CenterUniversity of WyomingLaramieWY 82071USA Department of Ecosystem Science&ManagementUniversity of WyomingLaramieWY 82071USA Haub School of Environment&Natural ResourcesUniversity of WyomingLaramieWY 82071USA Department of Plant SciencesUniversity of WyomingLaramieWY 82071USA 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2021年第15卷第1期

页      面：1-11页

核心收录：

学科分类：08[工学] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：We thank the US Geological Survey (USGS) for providing no-cost Landsat data and supporting this work under Grant/Cooperative Agreement No. G18AP00077 to the first author 

主　　题：Rapid Flood Mapping(RFM) inundation maps Satellite data NDWI MNDWI 

摘      要：Following flooding disasters,satellite images provide valuable information required for generating flood inundation *** or optical imagery can be used for generating flood maps when the inundated areas are not covered by *** 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 *** 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 *** on a threshold value,pixels corresponding to the flooded areas can be separated from non-flooded *** maps derived from differencing MNDWI values accurately captured the flooded *** 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 *** the inundation maps generated using this method have to be overlaid on the post-flood satellite image in order to orient personnel to landscape *** 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 *** 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.