Spectral estimates of net radiation and soil heat flux

C. S.T. Daughtry, W. P. Kustas, M. S. Moran, P. J. Pinter, R. D. Jackson, P. W. Brown, W. D. Nichols, L. W. Gay

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

Conventional methods of measuring surface energy balance are point measurements and represent only a small area. Remote sensing offers a potential means of measuring outgoing fluxes over large areas at the spatial resolution of the sensor. The objective of this study was to estimate net radiation (Rn) and soil heat flux (G) using remotely sensed multispectral data acquired from an aircraft over large agricultural fields. Ground-based instruments measured Rn and G at nine locations along the flight lines. Incoming fluxes were also measured by ground-based instruments. Outgoing fluxes were estimated using remotely sensed data. Remote Rn, estimated as the algebraic sum of incoming and outgoing fluxes, slightly underestimated Rn measured by the ground-based net radiometers. The mean absolute errors for remote Rn minus measured Rn were less than 7%. Remote G, estimated as a function of a spectral vegetation index and remote Rn, slightly overestimated measured G; however, the mean absolute error for remote G was 13%. Some of the differences between measured and remote values of Rn and G are associated with differences in instrument designs and measurement techniques. The root mean square error for available energy (Rn - G) was 12%. Thus, methods using both ground-based and remotely sensed data can provide reliable estimates of the available energy which can be partitioned into sensible and latent heat under nonadvective conditions.

Original languageEnglish (US)
Pages (from-to)111-124
Number of pages14
JournalRemote Sensing of Environment
Volume32
Issue number2-3
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • Soil Science
  • Geology
  • Computers in Earth Sciences

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    Daughtry, C. S. T., Kustas, W. P., Moran, M. S., Pinter, P. J., Jackson, R. D., Brown, P. W., Nichols, W. D., & Gay, L. W. (1990). Spectral estimates of net radiation and soil heat flux. Remote Sensing of Environment, 32(2-3), 111-124. https://doi.org/10.1016/0034-4257(90)90012-B