Improvement of MODIS 8-day LAI/FPAR product with temporal filters to generate high quality time-series product

Huifang Zhang, Runhe Shi, H. Zhong, P. Qu, Juan Sun, Wenpeng Lin, Su Li
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引用次数: 2

Abstract

Numerous studies have reported that the time-series terrestrial parameters such as the Normalized Difference Vegetation Index (NDVI), Leaf Area of Index (LAI), Fraction of Absorbed Photosynthetic Active Radiation (FPAR), derived from NOAA/AVHRR, SPOT/VEGETATION, TERRA or AQUA/MODIS, have played significant roles in researching the global environment, terrestrial ecosystems and related ecological researches. However, the remotely sensed signals are interfered severely by atmospheric conditions especially clouds and such noises exists in the time-series products as well. Therefore, to obtain a high quality time-series of terrestrial parameter is a necessary step before further studies. At present several methods have been applied to reduce the noise to construct a fine time-series of NDVI, but few studies concerning the other key terrestrial parameters, such as LAI, FPAR etc. In this paper, after comparing general methods in literatures, we designed a new method based on the Savitzky-Golay filter, which was applied to improve the quality of MODIS 8-Day LAI/FPAR Product to generate time-series of LAI and FPAR with high quality. Our validation results indicate that more smooth and realistic time-series curves of LAI/FPAR can be obtained by using this new method, which exemplify the dynamic change of forests, crop or plants and key input parameters in modeling the complex land surface processing.
用时间滤波器改进MODIS 8天LAI/FPAR产品,生成高质量的时间序列产品
大量研究报道,NOAA/AVHRR、SPOT/ Vegetation、TERRA或AQUA/MODIS等反演的归一化植被指数(NDVI)、叶面积指数(LAI)、吸收光合有效辐射分数(FPAR)等时间序列陆地参数在研究全球环境、陆地生态系统及相关生态学研究中发挥了重要作用。然而,遥感信号受大气条件尤其是云层的干扰严重,这种噪声也存在于时间序列产品中。因此,获得高质量的地面参数时间序列是进一步研究的必要步骤。目前已有几种降噪方法用于构建精细的NDVI时间序列,但对其他关键地面参数如LAI、FPAR等的研究较少。本文在比较文献中常用方法的基础上,设计了一种基于Savitzky-Golay滤波的新方法,用于提高MODIS 8天LAI/FPAR产品的质量,生成高质量的LAI和FPAR时间序列。验证结果表明,该方法可获得更平滑、更真实的LAI/FPAR时序曲线,体现了森林、作物或植物的动态变化以及模拟复杂地表处理的关键输入参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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