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Influences to in situ reflectance measurements in shallow water

Pinnel, Nicole and Gege, Peter (2009) Influences to in situ reflectance measurements in shallow water. 6th EARSeL SIG IS Workshop, 2009-03-16 - 2009-03-19, Tel Aviv (Israel).

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Abstract

In situ reflectance measurements taken under water may provide useful information about spectral discrimination of shallow water habitats. Often used as input in physical based inversion models or in supervised classification techniques of hyperspectral images, under water spectral libraries are essential to extract these fingerprints of various benthic substrate types. The advantage of reflectance measurements carried out under water is low attenuation of the small water column between substrate and sensor, but the disadvantage is the increased sensitivity to changing illumination, sun-angle, wave action and varying distance to the substrate. It often can lead to exclusion of many valuable spectral readings and/or time intensive statistical corrections. Transferability to other shallow water systems or comparison with other spectral libraries can thus become difficult. A physical understanding of various factors influencing bottom albedo is required. Radiance and irradiance reflectance spectra of homogeneous freshwater macrophytes and sand floor measured with a submersible spectroradiometer in 2003 and 2004 at two different lakes were used to investigate these influencing factors. The aim of this paper is to provide better understanding spectral variability and achieve a better comparison between spectral libraries making usage of such databases more reliable.

Document Type:Conference or Workshop Item (Speech)
Title:Influences to in situ reflectance measurements in shallow water
Authors:
AuthorsInstitution or Email of Authors
Pinnel, NicoleMurdoch University, Perth, Australia
Gege, PeterUNSPECIFIED
Date:17 March 2009
Keywords:Hyperspectral, shallow water, in situ, error sources
Event Title:6th EARSeL SIG IS Workshop
Event Location:Tel Aviv (Israel)
Event Type:international Conference
Event Dates:2009-03-16 - 2009-03-19
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Dr.rer.nat. Peter Gege
Deposited On:02 Apr 2009
Last Modified:27 Apr 2009 15:56

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