DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING
Change detection has been widely used in many flood-mapping algorithms using pairs of Synthetic Aperture Radar (SAR) intensity images as floodwater often leads to a substantial decrease of backscatter. However, limitations still exist in many areas, such as shadow, layover, urban areas and densely v...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-08-01
|
| Series: | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/V-1-2020/395/2020/isprs-annals-V-1-2020-395-2020.pdf |
| _version_ | 1818256312334548992 |
|---|---|
| author | J. Zhao J. Zhao M. Chini R. Pelich P. Matgen R. Hostache S. Cao W. Wagner |
| author_facet | J. Zhao J. Zhao M. Chini R. Pelich P. Matgen R. Hostache S. Cao W. Wagner |
| author_sort | J. Zhao |
| collection | DOAJ |
| description | Change detection has been widely used in many flood-mapping algorithms using pairs of Synthetic Aperture Radar (SAR) intensity images as floodwater often leads to a substantial decrease of backscatter. However, limitations still exist in many areas, such as shadow, layover, urban areas and densely vegetated areas, where the SAR backscatter is not sufficiently impacted by floodwater-related surface changes. This study focuses on these so-called exclusion areas, i.e. areas where SAR does not allow detecting water based on change detection. Our approach considers both pixel-based time series analyses and object-based spatial analyses using 20m Sentinel-1 Interferometric Wide Swath data, including 922 Sentinel-1 tiles covering the River Severn basin (UK) and the Lake Maggiore area (Italy). The results show that our exclusion map presents a good agreement (∼63%) with reference data derived from different data sources and indicate that it may complement SAR-derived flood extent maps. Allowing to accurately identify potential misclassifications in flood extent mapping, our exclusion map provides valuable information for flood management and, in particular, flood forecasting and prediction. |
| first_indexed | 2024-12-12T17:25:45Z |
| format | Article |
| id | doaj.art-2bafda8a8c084be8bb641d3c9f3f51c4 |
| institution | Directory Open Access Journal |
| issn | 2194-9042 2194-9050 |
| language | English |
| last_indexed | 2024-12-12T17:25:45Z |
| publishDate | 2020-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-2bafda8a8c084be8bb641d3c9f3f51c42022-12-22T00:17:31ZengCopernicus PublicationsISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences2194-90422194-90502020-08-01V-1-202039540010.5194/isprs-annals-V-1-2020-395-2020DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPINGJ. Zhao0J. Zhao1M. Chini2R. Pelich3P. Matgen4R. Hostache5S. Cao6W. Wagner7Department of Environmental Research and Innovation, Luxembourg Institute of Science and Technology, LuxembourgResearch Group Remote Sensing, Department of Geodesy and Geoinformation, Vienna University of Technology, AustriaDepartment of Environmental Research and Innovation, Luxembourg Institute of Science and Technology, LuxembourgDepartment of Environmental Research and Innovation, Luxembourg Institute of Science and Technology, LuxembourgDepartment of Environmental Research and Innovation, Luxembourg Institute of Science and Technology, LuxembourgDepartment of Environmental Research and Innovation, Luxembourg Institute of Science and Technology, LuxembourgResearch Group Remote Sensing, Department of Geodesy and Geoinformation, Vienna University of Technology, AustriaResearch Group Remote Sensing, Department of Geodesy and Geoinformation, Vienna University of Technology, AustriaChange detection has been widely used in many flood-mapping algorithms using pairs of Synthetic Aperture Radar (SAR) intensity images as floodwater often leads to a substantial decrease of backscatter. However, limitations still exist in many areas, such as shadow, layover, urban areas and densely vegetated areas, where the SAR backscatter is not sufficiently impacted by floodwater-related surface changes. This study focuses on these so-called exclusion areas, i.e. areas where SAR does not allow detecting water based on change detection. Our approach considers both pixel-based time series analyses and object-based spatial analyses using 20m Sentinel-1 Interferometric Wide Swath data, including 922 Sentinel-1 tiles covering the River Severn basin (UK) and the Lake Maggiore area (Italy). The results show that our exclusion map presents a good agreement (∼63%) with reference data derived from different data sources and indicate that it may complement SAR-derived flood extent maps. Allowing to accurately identify potential misclassifications in flood extent mapping, our exclusion map provides valuable information for flood management and, in particular, flood forecasting and prediction.https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/V-1-2020/395/2020/isprs-annals-V-1-2020-395-2020.pdf |
| spellingShingle | J. Zhao J. Zhao M. Chini R. Pelich P. Matgen R. Hostache S. Cao W. Wagner DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING |
| title_full | DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING |
| title_fullStr | DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING |
| title_full_unstemmed | DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING |
| title_short | DERIVING EXCLUSION MAPS FROM C-BAND SAR TIME-SERIES: AN ADDITIONAL INFORMATION LAYER FOR SAR-BASED FLOOD EXTENT MAPPING |
| title_sort | deriving exclusion maps from c band sar time series an additional information layer for sar based flood extent mapping |
| url | https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/V-1-2020/395/2020/isprs-annals-V-1-2020-395-2020.pdf |
| work_keys_str_mv | AT jzhao derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT jzhao derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT mchini derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT rpelich derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT pmatgen derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT rhostache derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT scao derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping AT wwagner derivingexclusionmapsfromcbandsartimeseriesanadditionalinformationlayerforsarbasedfloodextentmapping |