Remote measurement of algal chlorophyll in surface waters: The case for the first derivative of reflectance near 690 nm

Donald C. Rundquist, Luoheng Han, John Schalles, Jeffrey S. Peake

Research output: Contribution to journalArticle

123 Scopus citations


Remote sensing is an important technology for measuring algal-chlorophyll concentrations in surface waters. Our paper provides hyperspectral signatures, in the visible and near-infrared, associated with two experiments conducted outdoors in large water tanks; one involving relatively low amounts of chlorophyll over a narrow range and a second involving relatively high amounts over a wide range. The principal finding was that the commonly used near-infrared/red ratio is best for estimating pigment amounts when the concentration of chlorophyll is relatively low, and the first derivative of reflectance around 690 nm is best when the concentration is relatively high.

Original languageEnglish
Pages (from-to)195-200
Number of pages6
JournalPhotogrammetric Engineering and Remote Sensing
Issue number2
Publication statusPublished - Feb 1996


All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences (miscellaneous)
  • Computers in Earth Sciences
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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