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http://dx.doi.org/10.7780/kjrs.2005.21.6.445

A Reflectance Normalization Via BRDF Model for the Korean Vegetation using MODIS 250m Data  

Yeom, Jong-Min (Dept. of Environmental Atmospheric Science, Pukyung National University)
Han, Kyung-Soo (Dept. of Satellite Information Science. Pukyung National University)
Kim, Young-Seup (Dept. of Satellite Information Science. Pukyung National University)
Publication Information
Korean Journal of Remote Sensing / v.21, no.6, 2005 , pp. 445-456 More about this Journal
Abstract
The land surface parameters should be determined with sufficient accuracy, because these play an important role in climate change near the ground. As the surface reflectance presents strong anisotropy, off-nadir viewing results a strong dependency of observations on the Sun - target - sensor geometry. They contribute to the random noise which is produced by surface angular effects. The principal objective of the study is to provide a database of accurate surface reflectance eliminated the angular effects from MODIS 250m reflective channel data over Korea. The MODIS (Moderate Resolution Imaging Spectroradiometer) sensor has provided visible and near infrared channel reflectance at 250m resolution on a daily basis. The successive analytic processing steps were firstly performed on a per-pixel basis to remove cloudy pixels. And for the geometric distortion, the correction process were performed by the nearest neighbor resampling using 2nd-order polynomial obtained from the geolocation information of MODIS Data set. In order to correct the surface anisotropy effects, this paper attempted the semiempirical kernel-driven Bi- directional Reflectance Distribution Function(BRDF) model. The algorithm yields an inversion of the kernel-driven model to the angular components, such as viewing zenith angle, solar zenith angle, viewing azimuth angle, solar azimuth angle from reflectance observed by satellite. First we consider sets of the model observations comprised with a 31-day period to perform the BRDF model. In the next step, Nadir view reflectance normalization is carried out through the modification of the angular components, separated by BRDF model for each spectral band and each pixel. Modeled reflectance values show a good agreement with measured reflectance values and their RMSE(Root Mean Square Error) was totally about 0.01(maximum=0.03). Finally, we provide a normalized surface reflectance database consisted of 36 images for 2001 over Korea.
Keywords
MODIS 250m; BRDF; nearest neighbor; normalized reflectance;
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