Estimation of maize canopy properties from remote sensing by inversion of 1-D and 4-D models
Estimation of maize canopy properties from remote sensing by inversion of 1-D and 4-D models
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DOI：
10.1007/s11119-010-9162-9
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发表时间：
2010-08-01
影响因子：
6.2
通讯作者：
Jones, H. G.
中科院分区：
文献类型：
--
作者：
Casa, R.;Baret, F.;Jones, H. G.
植被冠层反射率模型反演是植被遥感反演的重要方法。然而，估计的准确性取决于一系列的因素，最显着的现实主义与树冠是由模型和引入先验知识的树冠特征，以约束反演过程的可能性。本工作的目的是比较两种对比类型的辐射传输模型的性能和操作限制：一个经典的一维冠层反射率模型，前景+SAIL（PROSAIL），和一个三维动态（4-D）玉米模型。后者在描述冠层结构和隐含的作物先验信息方面引入了更大的真实性。该评估是利用从阶段V5至V8的玉米田间实验记录的多视角数据进行的。单纯形数值优化算法被用来反演这两个模型，光谱反射率数据PROSAIL和空隙率数据的4-D玉米模型。叶面积指数（LAI）估计与RMSE为0.48 PROSAIL和0.35的4-D模型。检索平均叶倾角（ALA）是有问题的两个模型。观察视角的数量和分布的影响进行了检查，结果突出了斜角测量的优势。
The inversion of canopy reflectance models is widely used for the retrieval of vegetation properties from remote sensing. However the accuracy of the estimates depends on a range of factors, most notably the realism with which the canopy is represented by the models and the possibility of introducing a priori knowledge on canopy characteristics to constrain the inversion procedure. The objective of the present work was to compare the performances and operational limitations of two contrasting types of radiative transfer models: a classical one-dimensional canopy reflectance model, PROSPECT+SAIL (PROSAIL), and a three-dimensional dynamic (4-D) maize model. The latter introduces greater realism into the description of the canopy structure and implicit a priori information on the crop. The assessment was carried out with multiple view angle data recorded from field experiments on maize at stages V5 to V8. The simplex numerical optimization algorithm was used to invert the two models, using spectral reflectance data for PROSAIL and gap fraction data for the 4-D maize model. Leaf area index (LAI) was estimated with a RMSE of 0.48 for PROSAIL and 0.35 for the 4-D model. Retrieval of average leaf inclination angle (ALA) was problematic with both models. The effect of the number and distribution of observation view angles was examined, and the results highlight the advantage of oblique angle measurements.