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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Validating MODIS and Sentinel-2 NDVI Products at a Temperate Deciduous Forest Site Using Two Independent Ground-Based Sensors
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Validating MODIS and Sentinel-2 NDVI Products at a Temperate Deciduous Forest Site Using Two Independent Ground-Based Sensors

机译：使用两个独立的地面传感器在温带落叶林现场验证MODIS和Sentinel-2 NDVI产品

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Quantifying the accuracy of remote sensing products is a timely endeavor given the rapid increase in Earth observation missions. A validation site for Sentinel-2 products was hence established in central Germany. Automatic multispectral and hyperspectral sensor systems were installed in parallel with an existing eddy covariance flux tower, providing spectral information of the vegetation present at high temporal resolution. Normalized Difference Vegetation Index (NDVI) values from ground-based hyperspectral and multispectral sensors were compared with NDVI products derived from Sentinel-2A and Moderate-resolution Imaging Spectroradiometer (MODIS). The influence of different spatial and temporal resolutions was assessed. High correlations and similar phenological patterns between in situ and satellite-based NDVI time series demonstrated the reliability of satellite-based phenological metrics. Sentinel-2-derived metrics showed better agreement with in situ measurements than MODIS-derived metrics. Dynamic filtering with the best index slope extraction algorithm was nevertheless beneficial for Sentinel-2 NDVI time series despite the availability of quality information from the atmospheric correction procedure.
机译：鉴于对地观测任务的迅速增加，量化遥感产品的准确性是一项及时的工作。因此，在德国中部建立了Sentinel-2产品的验证站点。自动多光谱和高光谱传感器系统与现有的涡旋协方差通量塔并行安装，可提供高时间分辨率下存在的植被的光谱信息。将来自地面高光谱和多光谱传感器的归一化植被指数（NDVI）值与Sentinel-2A和中​​等分辨率成像光谱仪（MODIS）衍生的NDVI产品进行了比较。评估了不同时空分辨率的影响。原位和基于卫星的NDVI时间序列之间的高度相关性和相似的物候模式证明了基于卫星的物候指标的可靠性。与MODIS衍生的指标相比，Sentinel-2衍生的指标与原位测量显示出更好的一致性。尽管具有大气校正程序提供的质量信息，但具有最佳索引斜率提取算法的动态滤波仍对Sentinel-2 NDVI时间序列有利。

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