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46 Principles of Radiative Transfer

Part 5. Remote Sensing

  1. Matthias Drusch1,
  2. Susanne Crewell2

Published Online: 15 APR 2006

DOI: 10.1002/0470848944.hsa049

Encyclopedia of Hydrological Sciences

Encyclopedia of Hydrological Sciences

How to Cite

Drusch, M. and Crewell, S. 2006. Principles of Radiative Transfer. Encyclopedia of Hydrological Sciences. 5:46.

Author Information

  1. 1

    European Centre for Medium-Range Weather Forecasts, Reading, UK

  2. 2

    Munich University, Munich, Germany

Publication History

  1. Published Online: 15 APR 2006

Abstract

The article gives an introduction to classical vector radiative transfer theory (RTT). It comprises a brief summary of the fundamental quantities in RTT and the corresponding definitions. Based on these quantities, the transfer equation for radiation will be introduced in its basic form for a plane-parallel, horizontally homogeneous atmosphere. Polarization and the Stokes vector are introduced, which extend the scalar radiative transfer equation to the more general form of the vector radiative transfer equation. Scattering processes and interactions with the surface are discussed within the mathematical framework given in the first part of the paper. As an example, the theoretical concept presented is then applied to passive microwave remote sensing. A solution for the radiative transfer equation, which is commonly used for the retrieval of atmospheric quantities (e.g. water vapor) and land surface properties (e.g. soil moisture), is derived based on approximations and simplifications. More general approaches to solve the radiative transfer equation including multiple scattering are described and discussed in a separate section.

Keywords:

  • polarization;
  • radiative transfer;
  • remote sensing;
  • scattering