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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >The Effect of Spatial Resolution on Satellite Aerosol Optical Depth Retrieval
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The Effect of Spatial Resolution on Satellite Aerosol Optical Depth Retrieval

机译:空间分辨率对卫星气溶胶光学深度反演的影响

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We use data from the Multispectral Thermal Imager (MTI) to evaluate the effects of spatial resolution on the accuracy of aerosol optical depth (AOD) retrieval. Our results show that increasing the pixel size by itself has little effect on AOD retrieval accuracy at our chosen study site. However, increased pixel size does increase the error in AOD retrieval as a result of clouds. High-resolution sensors like MTI are able to avoid most clouds, but as the pixel size increases, subpixel clouds avoid the cloud mask, creep into selected pixels, and add a positive bias to the retrieved value of AOD. In accompanying work, we show that increasing pixel size has a small but noticeable impact on the normalized difference vegetation index (NDVI) and the 2.2-$mu$m reflectance, both used in the retrieval algorithm. We also examine the uniformity of the aerosol layer and show that the AOD varies by less than 0.02 in optical depth units over a 2.3$,times,$3.8 km$^2$area. An analysis of the temporal variability of Aerosol Robotic Network-retrieved AOD shows a standard deviation of 0.02 on partly cloudy days and 0.004 on clear days.
机译:我们使用来自多光谱热像仪(MTI)的数据来评估空间分辨率对气溶胶光学深度(AOD)检索精度的影响。我们的结果表明,在我们选择的研究站点中,单独增加像素大小对AOD检索精度几乎没有影响。但是,由于云的增加,像素大小的增加确实会增加AOD检索中的误差。像MTI这样的高分辨率传感器能够避免大多数云,但是随着像素大小的增加,子像素云会避开云遮罩,爬到选定的像素中,并对AOD的检索值增加正偏差。在伴随的工作中,我们表明,增加像素大小对归一化植被指数(NDVI)和2.2-μm反射率均具有较小但显着的影响,两者均用于检索算法中。我们还检查了气溶胶层的均匀性,结果表明,在光学深度单位中,AOD变化超过2.3 $,3.8 km $ ^ 2 $区域的光学深度单位小于0.02。气溶胶机器人网络获取的AOD的时间变化分析表明,在部分阴天,标准偏差为0.02;在晴天,标准偏差为0.004。

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