Temporal and Spatial Thermal Radiation Distribution Analysis within and above Crop Canopies by 3D Simulation

Huaguo Huang 1, 2, Lei Wang 1, Yang Zhang 2 and Qinhuo Liu 2 + 
1 Key Laboratory for Silviculture and Conservation, Ministry of Education;            
College of Forestry, Beijing Forestry University, 100083, Beijing, P.R. China
2 State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, 100101, Beijing, P.R. China

Abstract. The thermal radiation distribution within and above the canopy is explored. CUPID model is chosen to simulate the canopy component temperatures. TRGM model, based on 3D realistic structure and radiosity solution, is used to simulate the component brightness temperature distribution within canopy and thermal radiation emission directionality distribution  TB  (θ) above canopy. It is noted that the shape of vegetation component temperature profile mostly like an inverse “S” curve. Component temperature histogram is very good indicator to show daily variation. The difference between component brightness temperature and thermodynamic temperature mainly varies with LAI, relative height and leaf angle distribution. Through establishing relationship between TB (θ) variation, LAI and environmental parameters on crop canopies, the temporal effects or angular effects of the thermal radiation distribution is discussed.

Keywords: 3D simulation, thermal radiation distribution, TRGM, CUPID model

In: Wan, Y. et al. (eds) Proceeding of the 8th international symposium on spatial accuracy assessment in natural resources and environmental sciences, World Academic Union (Press).

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