Use Of Earth Observation Data For Hydrodynamic Modelling In The Mara Wetlands

Simple item page
dc.contributor.authorMtamba, Joseph
dc.contributor.authorVan der Velde, Rogier
dc.contributor.authorNdomba, Preksedis M.
dc.contributor.authorZoltan, Verkedy
dc.contributor.authorMtalo, Felix W.
dc.contributor.authorCrosato, Alessandra
dc.date.accessioned2016-03-23T08:41:40Z
dc.date.available2016-03-23T08:41:40Z
dc.date.issued2013-09-13
dc.description.abstractVegetation characteristics can not only be used to derive spatial hydrodynamic roughness parameters but also to correct vegetation artefacts in freely downloadable Digital Elevation Models for hydrodynamic modelling. An exponential backscattering model for vegetation canopy height model was developed using standard deviation of cross polarization backscatter coefficient of Radarsat-2 SAR wide swath mode and in situ vegetation height data. The retrieved spatial vegetation height was used to correct vegetation artefacts in freely downloadable Advanced Spaceborne Thermal Emission and Reflectance Radiometer Global Digital Elevation Model (ASTERDEM) released in 2011. The relative spatial hydrodynamic roughness within a vegetation class was derived from cross polarization ratio. Preliminary results show that the accuracy of ASTERDEM improved the elevation estimates by root mean square error from 5.1 m to 3.0m. Simulation results using Earth Observation (EO) data for calibration and validation using an internal gauging station yielded promising Nash - Sutcliffe efficiency criterion of 0.38 and 0.45. The results shows that if high resolution DEM is available, spatial roughness parametrization using cross-polarization ratio of Synthetic Aperture Radar (SAR) imagery may be useful in modelling extensive floodplains where optimization of roughness parameter is not necessary due to computational limitations.en_US
dc.identifier.citationMtamba, J.O., van der Velde, R., Ndomba, P.M., Zoltan, V., Mtalo, F.W. and Crosato, A., 2013, December. Use Of Earth Observation Data For Hydrodynamic Modelling In The Mara Wetlands. In ESA Special Publication (Vol. 722, p. 84).en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1242
dc.language.isoenen_US
dc.publisherESA Living Planet Symposiumen_US
dc.subjectBackscattering coefficienten_US
dc.subjectcanopy height modelen_US
dc.subjectflood modellingen_US
dc.subjectsurface roughnessen_US
dc.titleUse Of Earth Observation Data For Hydrodynamic Modelling In The Mara Wetlandsen_US
dc.typeConference Proceedingsen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Use Of Earth Observation Data For Hydrodynamic Modelling In The Mara Wetlands.pdf
Size:
2.61 MB
Format:
Adobe Portable Document Format
Description:
Full Text
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Department of Water Resources Engineering