CAJ | 학술논문

研究了植被冠层的热辐射方向性并建立了有关模型.从辐射传输机理出发,建立了3D冠层场景,并将场景以微分体元方式进行离散,根据给定的观测几何参数进行逐个体元内部与体元之间的多次散射及发射辐射传输计算,最终通过积分运算得到所有微分体在半球空间上对给定观测方向上的热辐射,得出整个冠层的热辐射方向性.利用两个时相的地面观测数据对3D辐射传输模型及模拟结果进行了验证和分析,相关系数分别为0.91和0.79,RMSE分别为0.4K和0.6K,证明建立的模型是有效的,能改进热红外温度反演精度和实现组分温度反演.
연구료식피관층적열복사방향성병건립료유관모형.종복사전수궤리출발,건립료3D관층장경,병장장경이미분체원방식진행리산,근거급정적관측궤하삼수진행축개체원내부여체원지간적다차산사급발사복사전수계산,최종통과적분운산득도소유미분체재반구공간상대급정관측방향상적열복사,득출정개관층적열복사방향성.이용량개시상적지면관측수거대3D복사전수모형급모의결과진행료험증화분석,상관계수분별위0.91화0.79,RMSE분별위0.4K화0.6K,증명건립적모형시유효적,능개진열홍외온도반연정도화실현조분온도반연.
Directional thermal radiation of canopy was studied and the related model was set up. According to the mechanism of radiative transfer, 3D canopy scenes were established and the scenes were discretized by differential cells. According to the observed geometric parameters, the radiative transfer of scatter and emission for every internal cell and among cells was calculated. Finally, the directional thermal radiation of canopy could be retrieved from the integral calculation of all differential bodies in the hemisphere. The existing in-situ data were used to test the 3D radiative transfer model and the simulating results. The correlation coefficients are 0.91 and 0.79, the RMSE are 0.4K and 0.6K, respetively. The results show that the model is effective and it can improve the precision of temperature inversion and realize component temperature inversion.