Hydraulic and event knowledge to reduce the positional uncertainty in SAR flood images for improved flood model calibration and development

TY - GEN

T1 - Hydraulic and event knowledge to reduce the positional uncertainty in SAR flood images for improved flood model calibration and development

AU - Schumann, Guy

AU - Black, Andrew

AU - Cutler, Mark

AU - Henry, Jean Baptiste

AU - Hoffmann, Lucien

AU - Matgen, Patrick

AU - Pfister, Laurent

PY - 2006/1/1

Y1 - 2006/1/1

N2 - 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.

AB - 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.

KW - Flood inundation model calibration

KW - Geometric correction

KW - Monte Carlo Simulation

KW - Positional uncertainty

KW - SAR flood imagery

UR - https://www.scopus.com/pages/publications/34249808414

M3 - Conference contribution

AN - SCOPUS:34249808414

SP - 633

EP - 642

BT - Proceedings of ACCURACY 2006 - 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences

A2 - Painho, Marco

A2 - Caetano, Mario

PB - Instituto Geografica Portugues

T2 - 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, ACCURACY 2006

Y2 - 5 July 2006 through 7 July 2006

ER -