Abstract
In an attempt to reduce the positional uncertainty in SAR images depicting floods and lakes, thereby largely improving the spatial accuracy of SAR-derived maps, this paper presents a Monte Carlo (MC) simulation-like image shifting procedure that shifts the X and Y coordinates of a SAR image until an acceptable minimum absolute error in elevation between the left and right flood extent level is found, whilst assuming a horizontal water surface on river cross sections. Independent Check Points (ICPs) indicating flood positions at bridges and elevated roads and railways are integrated with the MC-based procedure to provide direct validation of the image shifts. The proposed method, which requires hydraulic as well as event knowledge, greatly improves the positional accuracy of SAR-derived flood maps and thus presents an inviting alternative to adjust the initial inaccurate geo-referencing often encountered with SAR images. The importance of applying the proposed method is illustrated by applying it to a flood inundation model calibration procedure using a SAR-derived flood extent.
Original language | English |
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Title of host publication | Proceedings of ACCURACY 2006 - 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences |
Editors | Marco Painho, Mario Caetano |
Publisher | Instituto Geografica Portugues |
Pages | 633-642 |
Number of pages | 10 |
ISBN (Electronic) | 9728867271, 9789728867270 |
Publication status | Published - 1 Jan 2006 |
Event | 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, ACCURACY 2006 - Lisbon, Portugal Duration: 5 Jul 2006 → 7 Jul 2006 |
Conference
Conference | 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, ACCURACY 2006 |
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Country/Territory | Portugal |
City | Lisbon |
Period | 5/07/06 → 7/07/06 |
Keywords
- Flood inundation model calibration
- Geometric correction
- Monte Carlo Simulation
- Positional uncertainty
- SAR flood imagery
ASJC Scopus subject areas
- Geography, Planning and Development
- General Environmental Science
- Modelling and Simulation