Investigation of the difference between thermal infrared canopy temperature and microwave effective canopy temperature over homogeneous corn canopy

Jing Liu; Qinhuo Liu; Hongzhang Ma; Le Yang; Jingjing Peng

doi:10.1117/12.971451

19 October 2012 Investigation of the difference between thermal infrared canopy temperature and microwave effective canopy temperature over homogeneous corn canopy

Jing Liu, Qinhuo Liu, Hongzhang Ma, Le Yang, Jingjing Peng

Author Affiliations +

Proceedings Volume 8531, Remote Sensing for Agriculture, Ecosystems, and Hydrology XIV; 85311Y (2012) https://doi.org/10.1117/12.971451
Event: SPIE Remote Sensing, 2012, Edinburgh, United Kingdom

Abstract

Land surface temperature (LST) is an important parameter that modulates land surface process. The combination of infrared temperature and microwave temperature is a trend in the research of LST. Thermal infrared temperature and microwave temperature have different physical significances and values. However, they are always treated as the same temperature nowadays in the research on the combination of infrared temperature and microwave temperature. In this study, the homogeneous canopy is the leaf-dominated crown layer ignoring the effect of branches. Two layers with different temperature, the canopy layer and the soil layer, are considered. MESCAM model based on matrix doubling method has been modified by getting rid of the effects of the main and secondary stems. The effect of multiple scattering at L and C band has been studied by comparing the results of taoomiga model with that of the modified MESCAM model. Tao-omiga model was adopted to compute the canopy brightness temperature at L band and a simple geometric-optical model basing on gap probabilities was used to compute the canopy brightness temperature at thermal infrared band in the same scene. The relationship and the difference between thermal infrared canopy surface physical temperature and L band canopy effective physical temperature with different soil moisture have been analyzed in three different situations of T_C (the temperature of the foliage component) and T_S (the temperature of the soil component). It is a base of further exploring the cooperative inversion combining thermal infrared remote sensing with passive microwave remote sensing.

Citation Download Citation

Jing Liu, Qinhuo Liu, Hongzhang Ma, Le Yang, and Jingjing Peng "Investigation of the difference between thermal infrared canopy temperature and microwave effective canopy temperature over homogeneous corn canopy", Proc. SPIE 8531, Remote Sensing for Agriculture, Ecosystems, and Hydrology XIV, 85311Y (19 October 2012); https://doi.org/10.1117/12.971451

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KEYWORDS

Infrared radiation

Thermography

Microwave radiation

L band

Polarization

Vegetation

Soil science

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