The high spatial resolution and temporal observation frequency of HJ-1/CCD make it suitable for aerosol monitoring.However,because of the lack of a shortwave infrared band,it is difficult to use HJ-1/CCD imagery to re...The high spatial resolution and temporal observation frequency of HJ-1/CCD make it suitable for aerosol monitoring.However,because of the lack of a shortwave infrared band,it is difficult to use HJ-1/CCD imagery to retrieve aerosol optical depth(AOD).We developed a new algorithm for HJ-1/CCD AOD retrieval by introducing MODIS surface reflectance outputs(MOD09) as support.In this algorithm HJ-1/CCD blue band surface reflectance was retrieved through MOD09 blue band surface reflectance by band matching of the two sensors.AOD at 550 nm was then generated through a pre-calculated look-up table for HJ-1/CCD.Eighteen HJ-1/CCD images covering the Jing-Jin-Tang(Beijing-Tianjin-Tangshan) region were used to retrieve AOD using the new algorithm,and the AODs were then validated using AERONET ground measurements in Beijing and Xianghe.The validation shows that compared with AERONET ground measurements,27/29 AODs have error less than 0.1 in absolute value.展开更多
利用LAI2000测量了帽儿山实验林场23个不同类型森林样区的叶面积指数(leaf area index,LA,I),根据LA,I观测数据和由环境一号卫星HJ—1CCD数据及Landsat—5 TM数据计算的比植被指数(SR),分别建立了研究区森林LA,I的估算模型。在此基础上...利用LAI2000测量了帽儿山实验林场23个不同类型森林样区的叶面积指数(leaf area index,LA,I),根据LA,I观测数据和由环境一号卫星HJ—1CCD数据及Landsat—5 TM数据计算的比植被指数(SR),分别建立了研究区森林LA,I的估算模型。在此基础上,对比分析了CCD和TM数据在红光和近红外波段的特征,评价了利用这两种遥感数据提取的研究区LA,I的差别。结果表明,CCD数据在红光波段的质量比TM3稍偏低,CCD数据在近红外波段的信息量丰富;利用CCD与TM数据提取的LA,I具有很好的相关性(R2=0.736 4,n=180 339),但前者提取的LA,I比后者平均偏高0.23(4.5%);CCD数据在空间分辨率、辐射分辨率、波段设置上都与TM数据具有较好的一致性,同时,CCD还具有比TM高得多的时间分辨率(2 d),可以有效应用于较大范围森林LA,I的提取。展开更多
基金National Key Research and Development Program of China(2018YFC1508301,2018YFC1508302)National Natural Science Foundation of China(31871516)Hubei Natural Science Foundation(2019CFB507)。
基金supported by National Natural Science Foundation of China (Grant No.40701112)National Key Technology R & D Program of China (Grant No.2008BAC34B03)National High-tech R & D Program of China (Grant No.2009AA12Z147)
文摘The high spatial resolution and temporal observation frequency of HJ-1/CCD make it suitable for aerosol monitoring.However,because of the lack of a shortwave infrared band,it is difficult to use HJ-1/CCD imagery to retrieve aerosol optical depth(AOD).We developed a new algorithm for HJ-1/CCD AOD retrieval by introducing MODIS surface reflectance outputs(MOD09) as support.In this algorithm HJ-1/CCD blue band surface reflectance was retrieved through MOD09 blue band surface reflectance by band matching of the two sensors.AOD at 550 nm was then generated through a pre-calculated look-up table for HJ-1/CCD.Eighteen HJ-1/CCD images covering the Jing-Jin-Tang(Beijing-Tianjin-Tangshan) region were used to retrieve AOD using the new algorithm,and the AODs were then validated using AERONET ground measurements in Beijing and Xianghe.The validation shows that compared with AERONET ground measurements,27/29 AODs have error less than 0.1 in absolute value.
