Determination of chlorophyll content of small water bodies (kettle holes) using hyperspectral airborne data
Igamberdiev, Rahmatulla and Grenzdoerffer, Goerres and Bill, Ralf and Schubert, Hendrik and Bachmann, Martin and Lennartz, Bernd (2011) Determination of chlorophyll content of small water bodies (kettle holes) using hyperspectral airborne data. International Journal of Applied Earth Observation and Geoinformation, 13 (6), pp. 912-921. DOI: http://dx.doi.org/10.1016/j.jag.2011.04.001.
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This study presents an approach for chlorophyll content determination of small shallow water bodies (kettle holes) from hyperspectral airborne ROSIS and HyMap data (acquired on 15 May and 29 July 2008 respectively). Investigated field and airborne spectra for almost all kettle holes do not correspond to each other due to differences in ground sampling distance. Field spectra were collected from the height of 30–35 cm (i.e. area of 0.01–0.015 m2). Airborne pixels of ROSIS and HyMap imageries cover an area of 4 m2 and 16 m2 respectively and their spectra are highly influenced by algae or bottom properties of the kettle holes. Analysis of airborne spectra revealed that chlorophyll absorption near 677 nm is the same for both datasets. In order to enhance absorption properties, both airborne hyperspectral datasets were normalized by the continuum removal approach. Linear regression algorithms for ROSIS and HyMap datasets were derived using normalized average chlorophyll absorption spectra for each kettle hole. Overall accuracy of biomass mapping for ROSIS data was 71%, and for HyMap 64%. Biomass mapping results showed that, depending on the type of kettle hole, algae distribution, the ‘packaging effect’ and bottom reflection lead to miscalculations of the chlorophyll content using hyperspectral airborne data.
|Title:||Determination of chlorophyll content of small water bodies (kettle holes) using hyperspectral airborne data|
|Journal or Publication Title:||International Journal of Applied Earth Observation and Geoinformation|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 912-921|
|Keywords:||Small shallow water body (kettle hole); Hyperspectral imagery; Chlorophyll mapping|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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|
|Institutes and Institutions:||German Remote Sensing Data Center > Land Surface|
|Deposited By:||Dr.rer.nat. Martin Bachmann|
|Deposited On:||28 Sep 2011 20:34|
|Last Modified:||19 Apr 2013 09:29|
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