Abstract
Abstract. EOS/MODIS land surface Bi-directional Reflectance Distribution Function (BRDF) product (MCD43), with the latest version C6, is one of the most important operational BRDF products with global coverage. The core sub-product MCD43A1 stores 3 parameters of the RossThick-LiSparseR semi-empirical kernel-driven BRDF model. It is important for confident use of the product to evaluate the accuracy of bi-directional reflectance factor (BRF) predicted by MCD43A1 BRDF model (mBRF). A typical region in the central part of Northeast Asia is selected as the study area. The performance of MCD43A1 BRDF model is analyzed in various observation geometries and phenological phases, using Multi-angle Imaging SpectroRadiometer (MISR) land-surface reflectance factor product (MILS_BRF) as the reference data. In addition, MODIS products MCD12Q1 and MOD/MYD10A1 are used to evaluate the impacts of land cover types and snow covers on the model accuracy, respectively. The results show an overall excellent performance of MCD43A1 in representing the anisotropic reflectance of land surface, with root mean square error (RMSE) of 0.0262 and correlation coefficient (R) of 0.9537, for all available comparable samples of MILS_BRF and mBRF pairs. The model accuracy varies in different months, which is related to the phenological phases of the study area. The accuracy for pixels labelled as ‘snow’ by MCD43 is obviously low, with RMSE/R of 0.0903/0.8401. Ephemeral snowfall events further decrease the accuracy, with RMSE/R of 0.1001/0.7715. These results provide meaningful information to MCD43 users, especially those, whose study regions are subject to phenological cycles as well as snow cover and change.
Highlights
The MODIS Bi-directional Reflectance Distribution Function (BRDF) Product (MCD43) is of the characteristics of high temporal resolution, high spatial resolution, full optical spectral coverage as well as global imaging
A large number of validation and accuracy analysis works have been carried out on RossThick-LiSparseR semiempirical BRDF (RTLSR) model and MCD43A1 products (Hu et al, 1997; Huang et al, 2013; Jin et al, 2003; Shuai et al, 2008). These works show that the RTLSR model has a wide range of adaptability, MCD43A1 products have good consistency for a long period, and its accuracy can meet the requirements of many applications and researches
A typical region in the central part of Northeast Asia is selected as the study area and the performance of MCD43A1 Collection 6 (C6) BRDF model is analysed in various observation geometries and phenological phases, using the Multi-angle Imaging SpectroRadiometer (MISR) land-surface reflectance factor (BRF) product (MILS_BRF) as the reference data
Summary
The MODIS Bi-directional Reflectance Distribution Function (BRDF) Product (MCD43) is of the characteristics of high temporal resolution, high spatial resolution, full optical spectral coverage as well as global imaging. It is currently one of the most important operational data sources of land surface BRDF. A large number of validation and accuracy analysis works have been carried out on RTLSR model and MCD43A1 products (Hu et al, 1997; Huang et al, 2013; Jin et al, 2003; Shuai et al, 2008). These works show that the RTLSR model has a wide range of adaptability, MCD43A1 products have good consistency for a long period, and its accuracy can meet the requirements of many applications and researches
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