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Spatial Downscaling for Global Precipitation Measurement Using a Geographically and Temporally Weighted Regression Model

机译:使用地理上和时间加权回归模型的全球降水测量的空间缩小

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High-resolution precipitation data are crucial to monitor disasters in urban areas, especially in cases with abundant precipitation. Based on the spatiotemporal, non-stationary relationship between precipitation and normalized differential vegetation index (NDVI), in this paper we introduce a geographically and temporally weighted regression (GTWR) model and further evaluate it in a case study in Guangdong province, China, in the summer of 2015. Our results indicate that there is a mainly negative correlation between precipitation and NDVI in the summer. Our GTWR downscaling model performs better than a previously available geographically weighted regression (GWR) model, providing more accurate downscaled precipitation estimations. This suggests that considering the spatiotemporal, non-stationarity relationship between NDVI and precipitation, our GTWR downscaling model can provide high-spatial resolution precipitation estimates, with more details in urban areas with abundant precipitation.
机译:高分辨率降水数据对于监测城市地区的灾害至关重要,特别是在降水量丰富的情况下。基于沉淀和归一化差分植被指数(NDVI)之间的时空,非静止关系(NDVI),在本文中,我们在地理上和时间加权回归(GTWR)模型中,进一步评估了中国广东省的案例研究2015年夏天。我们的结果表明,夏季,降水和NDVI之间存在负相关性。我们的GTWR缩小模型比以前可用的地理加权回归(GWR)模型更好地执行,提供更准确的较低的降水估计。这表明,考虑到NDVI和降水之间的时空,非公平关系,我们的GTWR缩小模型可以提供高空间分辨率降水估计,以及丰富降水的城市地区有更多细节。

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