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Research Letters in Ecology
Volume 2008 (2008), Article ID 146217, 4 pages
http://dx.doi.org/10.1155/2008/146217
Research Letter

Chlorophyll Detection and Mapping of Shallow Water Impoundments Using Image Spectrometry

1Meadowlands Environmental Research Institute, New Jersey Meadowlands Commission, 1 DeKorte Park Plaza, Lyndhurst, NJ 07071, USA
2Department of Earth and Environmental Sciences, Rutgers University, 249 University Avenue, Newark, NJ 07102, USA
3Department of Physics, Harvard University, 9 Oxford Street, Cambridge, MA 02138, USA
4Department of Biological Sciences, Rutgers University, 249 University Avenue, Newark, NJ 07102, USA

Received 25 June 2008; Accepted 1 December 2008

Academic Editor: Patricia Mosto

Copyright © 2008 Francisco Artigas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

The supplementary material consists of three figures and one table.

Figure 1 shows the geographical location of the study site and position of the sampling transects, where the field measurements were taken.

Figure 2 displays the trends in total suspended solid (TSS) and chlorophyll a (Chl a) concentrations along the three study transects starting from the shore and heading towards the open water.

Figure 3 is a collection of typical spectral profiles associated with living plant pigments in the visible and near-infrared range of light. The spectral curves were first smoothed using a seven point moving window average (Savitzky-Goley algorithm). Next, the smoothed data was approximated by a LaGrange polynomial which was then used to calculate the first and second derivatives of the curves.

Table 1 in the supplementary materials shows the relationship between several published spectral indices (see columns) and water constituents (TSS and Chl a). In calculating the indices, raw curves as well as their first and second derivatives were used (see rows).

  1. Supplementary Materials