Open WL Archief (OWA)

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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.

Basisinformatie over ‘Open Access to scholarly information'.

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Bathymetric mapping of coral reefs in the Red Sea (Hurghada-Egypt) using Landsat7 ETM+ data Vanderstraete, T.; Goossens, R.; Ghabour, T.K. (2002). Bathymetric mapping of coral reefs in the Red Sea (Hurghada-Egypt) using Landsat7 ETM+ data. Presented at the Seventh International Conference on Remote Sensing for Marine and Coastal Environments, Miami, Florida, 20-22 May 2002. [S.n.]: [s.l.]. 8 pp.

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 118892 [ download pdf ]
Documenttype: Congresbijdrage

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Trefwoorden

Audiovisual materials > Graphics > Maps > Hydrographic charts > Bathymetric charts Reefs > Biogenic deposits > Coral reefs Remote sensing Remote sensing > Geosensing > Satellite sensing ISW, Red Sea, Hurghada Marien/Kust

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Auteurs		Top
Vanderstraete, T., meer Goossens, R., meer Ghabour, T.K., meer

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Abstract

For monitoring threats posed on coral reefs a bathymetric map is useful as a base to locate vulnerable areas. For mapping shallow features as coral reefs in the Red Sea, conventional echo sounding methods are usually inappropriate due to the draught of the vessels used. Here remote sensing can bring a solution. Different methods have already been developed to map bathymetry using passive remote sensing. In this paper the modified Depth of Penetration mapping method suggested by Green et al. (2000) is implemented on a Landsat7 ETM+ image. This method is mainly based on the different attenuation coefficients of sequencing wavelengths in water. Using additional ground-truth observations, depths can be estimated. Although this method results in an acceptable bathymetric map, some deviations from groundtruth occur. These differences caused by errors inherent to the method used, field sampling or implementation, are examined and possible solutions are presented.

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