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Relationships between high resolution RapidEye based fPAR and MODIS vegetation indices in a heterogeneous agricultural region

机译：异质农业区高分辨率基于RapidEye的fPAR与MODIS植被指数之间的关系

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摘要

The Moderate Imaging Spectroradiometer (MODIS) provides operational products of the Normalized Difference Vegetation Index (NDVI), the Enhanced Vegetation Index (EVI), and the fraction of photosynthetic active radiation (fPAR). FPAR can be used in productivity models, but agricultural applications depend on sub-pixel heterogeneity. Examples for heterogeneous areas are the irrigation systems of the inner Aral Sea Basin, where the 1 km fPAR product proved less suited. An alternative can be to upscale fPAR to the 250 m scale, but there are few studies evaluating this approach. In this study, the use of MODIS 250 m NDVI and EVI for this approach was investigated in an irrigation system in western Uzbekistan. The analysis was based on high resolution fPAR maps and a crop map for the growing season 2009, derived from ground measurements and multitemporal RapidEye data. The data was used to explore statistical relationships between RapidEye fPAR and MODIS NDVI7EVI with respect to spatial heterogeneity. The correlations varied between products (daily NDVI, 8-day NDVI, 16-day NDVI/EVI), with results suggesting that 8-day NDVI performed best. The analyses and the compiled fPAR maps show that, compared to 1km MODIS fPAR, the 250m scale is more homogeneous, allows for crop-specific analyses, and better captures the spatial patterns in the study region.
机译：中度成像光谱仪（MODIS）提供归一化植被指数（NDVI），增强植被指数（EVI）和光合作用活性辐射（fPAR）的操作产品。 FPAR可用于生产力模型，但农业应用取决于亚像素异质性。异质地区的例子是内咸海盆地的灌溉系统，那里的1 km fPAR产品被证明不太合适。另一种选择是将fPAR升级到250 m规模，但是很少有研究评估这种方法。在这项研究中，在乌兹别克斯坦西部的灌溉系统中研究了使用MODIS 250 m NDVI和EVI进行此方法。该分析基于高分辨率fPAR图和2009年生长季节的作物图，这些图来自地面测量和多时相RapidEye数据。该数据用于探索RapidEye fPAR和MODIS NDVI7EVI之间在空间异质性方面的统计关系。产品之间的相关性有所不同（每天NDVI，8天NDVI，16天NDVI / EVI），结果表明8天NDVI表现最佳。分析和已编译的fPAR图显示，与1km MODIS fPAR相比，250m尺度更均匀，可以进行特定于作物的分析，并且可以更好地捕获研究区域中的空间格局。

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