Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia
The Sentinel-1 SAR dataset provides the opportunity to monitor floods at unprecedentedly high spatial and temporal resolutions. However, the accuracy of the flood maps can be affected by the image polarization, the flood detection method used, and the reference data. This research compared change de...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Elsevier
2022
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/120381 |
| _version_ | 1855537742578974720 |
|---|---|
| author | Bekele, Tilaye Worku Haile, Alemseged Tamiru Trigg, M. A. Walsh, C. L. |
| author_browse | Bekele, Tilaye Worku Haile, Alemseged Tamiru Trigg, M. A. Walsh, C. L. |
| author_facet | Bekele, Tilaye Worku Haile, Alemseged Tamiru Trigg, M. A. Walsh, C. L. |
| author_sort | Bekele, Tilaye Worku |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The Sentinel-1 SAR dataset provides the opportunity to monitor floods at unprecedentedly high spatial and temporal resolutions. However, the accuracy of the flood maps can be affected by the image polarization, the flood detection method used, and the reference data. This research compared change detection and histogram thresholding methods using co-polarization (VV) and cross-polarization (VH) images for flood mapping in the Akaki catchment, Ethiopia, where Addis Ababa city is located. Reference data for the accuracy assessment were collected on the satellite overpass date. A new method, Root of Normalized Image Difference (RNID), has been developed for change detection. Multi-temporal flood maps using the best performing method and image polarization were generated from April to November of 2017–2020. Better accuracy was observed when using the RNID method on the VH polarization image with an overall accuracy of 95% and a kappa coefficient of 0.86. Results showed that flooding in the Akaki commonly begins in May and recedes in November, but flooding was most frequent and widespread from June to September. Irrigated land and built-up area accounted for 1057 ha and 544 ha of the inundated area, respectively. Several major roads in the study area were also affected by the floods during this period. Our findings indicate that the S-1 images were very useful for flood inundation mapping, the new change detection method (RNID) performed better in urban and peri-urban flood mapping, but the accuracy of the flood map significantly varied with the flood detection method and the image polarization. |
| format | Journal Article |
| id | CGSpace120381 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace1203812024-06-26T10:18:13Z Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia Bekele, Tilaye Worku Haile, Alemseged Tamiru Trigg, M. A. Walsh, C. L. flooding mapping remote sensing urban areas periurban areas catchment areas satellite imagery polarization sar (radar) datasets land use land cover The Sentinel-1 SAR dataset provides the opportunity to monitor floods at unprecedentedly high spatial and temporal resolutions. However, the accuracy of the flood maps can be affected by the image polarization, the flood detection method used, and the reference data. This research compared change detection and histogram thresholding methods using co-polarization (VV) and cross-polarization (VH) images for flood mapping in the Akaki catchment, Ethiopia, where Addis Ababa city is located. Reference data for the accuracy assessment were collected on the satellite overpass date. A new method, Root of Normalized Image Difference (RNID), has been developed for change detection. Multi-temporal flood maps using the best performing method and image polarization were generated from April to November of 2017–2020. Better accuracy was observed when using the RNID method on the VH polarization image with an overall accuracy of 95% and a kappa coefficient of 0.86. Results showed that flooding in the Akaki commonly begins in May and recedes in November, but flooding was most frequent and widespread from June to September. Irrigated land and built-up area accounted for 1057 ha and 544 ha of the inundated area, respectively. Several major roads in the study area were also affected by the floods during this period. Our findings indicate that the S-1 images were very useful for flood inundation mapping, the new change detection method (RNID) performed better in urban and peri-urban flood mapping, but the accuracy of the flood map significantly varied with the flood detection method and the image polarization. 2022-06 2022-07-31T23:23:03Z 2022-07-31T23:23:03Z Journal Article https://hdl.handle.net/10568/120381 en Open Access Elsevier Bekele, Tilaye Worku; Haile, Alemseged Tamiru; Trigg, M. A.; Walsh, C. L. 2022. Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia. Natural Hazards Research, 2(2):97-110. [doi: https://doi.org/10.1016/j.nhres.2022.03.001] |
| spellingShingle | flooding mapping remote sensing urban areas periurban areas catchment areas satellite imagery polarization sar (radar) datasets land use land cover Bekele, Tilaye Worku Haile, Alemseged Tamiru Trigg, M. A. Walsh, C. L. Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title | Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title_full | Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title_fullStr | Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title_full_unstemmed | Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title_short | Evaluating a new method of remote sensing for flood mapping in the urban and peri-urban areas: applied to Addis Ababa and the Akaki Catchment in Ethiopia |
| title_sort | evaluating a new method of remote sensing for flood mapping in the urban and peri urban areas applied to addis ababa and the akaki catchment in ethiopia |
| topic | flooding mapping remote sensing urban areas periurban areas catchment areas satellite imagery polarization sar (radar) datasets land use land cover |
| url | https://hdl.handle.net/10568/120381 |
| work_keys_str_mv | AT bekeletilayeworku evaluatinganewmethodofremotesensingforfloodmappingintheurbanandperiurbanareasappliedtoaddisababaandtheakakicatchmentinethiopia AT hailealemsegedtamiru evaluatinganewmethodofremotesensingforfloodmappingintheurbanandperiurbanareasappliedtoaddisababaandtheakakicatchmentinethiopia AT triggma evaluatinganewmethodofremotesensingforfloodmappingintheurbanandperiurbanareasappliedtoaddisababaandtheakakicatchmentinethiopia AT walshcl evaluatinganewmethodofremotesensingforfloodmappingintheurbanandperiurbanareasappliedtoaddisababaandtheakakicatchmentinethiopia |