A comparison between above-water surface and subsurface spectral reflectances collected over inland waters

Asif M. Bhatti, Donald Rundquist, John Schalles, Luis Ramirez, Seigo Nasu

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The objective of the research was to undertake a quantitative comparison of spectral-reflectance measurements made slightly above the surface of water bodies with the measurements made slightly below the surface. The study is focused on three rivers; two in Georgia, USA and one in Japan. As expected, the differences in reflectance are not constant and vary with the wavelength. The contribution of surface-reflection effects to the surface reflectance measured slightly above the water is both pronounced and highly variable, but although they do alter the magnitude of the upwelling signal, they do not change the general shape of the spectral profiles. The correction of surface-reflection effects by assuming a proportionality factor (ρ) is not considered to be efficient for inland fresh water bodies. For in situ spectroscopy, the recommended approach is to measure upwelling radiance slightly below the water's surface as a means of minimizing extraneous noise. Researchers should be aware of the potential for diminishing the validity of findings because of measurement errors.

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalGeocarto International
Volume24
Issue number2
DOIs
StatePublished - 2009

Fingerprint

spectral reflectance
surface water
water
bodies of water
upwelling
proportionality
surface reflectance
river
Japan
radiance
reflectance
spectroscopy
wavelength
inland water
comparison
water body
effect

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Geography, Planning and Development

Cite this

A comparison between above-water surface and subsurface spectral reflectances collected over inland waters. / Bhatti, Asif M.; Rundquist, Donald; Schalles, John; Ramirez, Luis; Nasu, Seigo.

In: Geocarto International, Vol. 24, No. 2, 2009, p. 133-141.

Research output: Contribution to journalArticle

Bhatti, Asif M. ; Rundquist, Donald ; Schalles, John ; Ramirez, Luis ; Nasu, Seigo. / A comparison between above-water surface and subsurface spectral reflectances collected over inland waters. In: Geocarto International. 2009 ; Vol. 24, No. 2. pp. 133-141.
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