Abstract
Remote sensing (RS) of land surface temperature (LST) is a very challenging problem at the present development stage of RS science. Tremendous efforts have been devoted to atmosphere correction and temperature emissivity separation (TES) of new LST product algorithms. However, the mechanism of directionality of thermal emission from land surface remains unknown, and even worse, there are confusions on the definition of the effective emissivity of land surface at the scale of RS pixels. The mechanism of directionality of thermal emission for isothermal pixels and non-isothermal pixels is different. For non-isothermal pixels (case in most canopy/soil structures), the directionality of their thermal emission is determined by both bidirectional reflectance distribution function (BRDF) derived emissivity and distribution patterns of temperature differences. A new definition is suggested to take into account material mixture, multiple scattering, and temperature variation within thermal infrared (TIR) RS pixels.
Similar content being viewed by others
References
Wan, Z., Dozier, J., A generalized split-window algorithm for retrieving land-surface temperature fmm spac:o,IEEE Trans. Geosci. Remote Sens., 1996, 34(4): 892.
Norman, J., Becker, F., Terminology in thermal infrared remote sensing of natural surfaces,Agr. and For. Meteo., 1995, 77: 153. also inRemote Sensing Review, 1995, 12: 159.
Becker, F., Li, Z., Surface temperature and emissivity at various scales: definition, measurement, and related problems.Remote Sensing Review, 1995, 12: 225.
Kimes, D. S., Smith, J. A., Link, I. E., Thermal IR exitance model of a plant canopy,App. Optics., 1981, 20(4): 623.
Dazier, J., Warren, S. G., Effect of viewing angle on the infd brightness temperature of snow,Water Resour. Res., 1982, 18(5): 1424.
Balick, L., Scoggins, R., Link, L., Inclusion of a simple vegetation layer in terrain temperature models for TIR signature prediction,IEEE Tranc. Geosci. Remote Sens., 1981, GE19(3): 143.
Li, X., Strahler, A.. Woodcock, C., A hybrid geometric optical-radiative transfer appronch for modeling albedo and dimtional reflectance of discontinuous canopies,IEEE Trans. Geosci. Remote Sens., 1995, 33(2): 466.
Dozier, J.. A method for satellite identification of surface temperature fields of subpixel nrsolution,Remote Sens. Environ., 1981, 11: 221.
Author information
Authors and Affiliations
About this article
Cite this article
Li, X., Wang, J. The definition of effective emissivity of land surface at the scale of remote sensing pixels. Chin. Sci. Bull. 44, 2154–2158 (1999). https://doi.org/10.1007/BF03182699
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03182699