设为首页
加入收藏
用NOAA/AVHRR探测地表反射率和NDVI的订正及误差分析
CORRECTIONS TO NOAA/AVHRR REFLECTANCE AND NDVI AND THEIR ERROR ANALYSIS
-
摘要: NOAA/ AVHRR反射率和标准化差值植被指数 (NDVI) 资料在气象、水文等领域都有广泛的应用。但因为地表双向反射和大气对可见光和近红外辐射的影响, 即使在地表没有变化的情况下, 卫星探测到的反射率和NDVI也有很大的变化。在除云处理和NOAA-14/AVHRR衰减校准的基础上, 利用6S模式对NOAA-14/AVHRR可见光和近红外反射率及NDVI资料进行了大气订正, 并利用Roujean和Rahman模式在大气订正后进行了双向反射订正。大气订正使可见光反射率减小3.34(反射率单位), 近红外反射率增加3.43(反射率单位), NDVI增加了0.22, 分别占各自平均值的78.2%, 15.9%, 35.5%。双向反射订正对NDVI的绝对值影响不大, 但消除了反射率和NDVI的不规则变化, 订正后能够较好地反映森林植被的物候效应。对各订正参数进行了误差分析, 结果表明订正对太阳和卫星天顶角的误差最敏感。Abstract: NOAA/AVHRR reflectance and normalized difference vegetation index (NDVI) data have been widely used in meteorological and hydrological fields.Because the bi-directional reflectance distribution of surface and the scatter and absorption effects of atmosphere, even though the surface keeps unchanged, the reflectance obtained by satellites can vary greatly.After cloud-removing and degradation-correcting processing, atmospheric corrections are carried out to NOAA/AVHRR visible and near-inf rared reflectance and NDVI data using the 6S model, and then bi-directional reflectance corrections are carried out.The atmospheric correction makes the visible reflectanc decrease by 3.34 (reflectance unit), the near infrared reflectance increase by 3.43 (reflectance unit), and increases the NDVI increase by 0.22, equaling to 78.2 percent, 15.9 percent and 35.5 percent of theirown respectively.The bi-directional reflectance correction does not affect the amount of NDVI distinctively, but can remove the irregular variances of the reflectance and NDVI.After corrections, the reflectance and NDVI can reflect the phenological effect of deciduous forests (the land cover of the surface target).At last, based on the error analysis, the sensitivities of correction errors to the errors of correction parameters are given, and the results show that the solar and satellite zenith angles are the most sensitive parameters.
-
表 1 订正参数
表 2 大气各成分的平均订正差值
表 3 4参数Rahman模式拟合的结果
表 4 大气订正误差的敏感度
表 5 双向反射订正误差的敏感度
-
[1] 刘健, 许健民, 方宗义.利用NOAA卫星的AVHRR资料试分析云和雾顶部的粒子尺度特征.应用气象学报, 1999, 10(1):28-33. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990132&flag=1 [2] 石宇虹, 朴瀛, 张箐.应用NOAA/ AVHRR资料监测水稻长势的研究.应用气象学报, 1999, 10(2):243-248. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990264&flag=1 [3] 陈怀亮, 冯定原, 邹春辉.用遥感资料估算深层土壤水分的方法和模型.应用气象学报, 1999, 10(2):232-237. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990262&flag=1 [4] 秦益, 田国良.NOAA-AVHRR图像大气影响较正方法研究及软件研制:第一部分:原理和模型.环境遥感, 1994, 9(1):11-21. http://www.cnki.com.cn/Article/CJFDTOTAL-YGXB401.001.htm [5] 秦益, 田国良.NOAA-AVHRR图像大气影响较正方法研究及软件研制:第二部分:软件研制.环境遥感, 1994, 9(2):81-91. http://www.cnki.com.cn/Article/CJFDTOTAL-YGXB402.000.htm [6] 吴艾笙.黑河实验区AVHRR反射资料的各向异性订正.高原气象, 1990, 9(2):136-143. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX199002004.htm [7] Vermote E F, Tanre D, Herman M, et al.Second simulation of satellite signal in the solar spectrum, 6S :an overview.IEEE Transaction Geosciences and Remote Sensing, 1997, 35(35):675-686. [8] Roujean J L, Leroy M, Deschamps P, et al.A bi-directional reflectance model of the earth's surface for the correction ofremote sensing data.J.Geophys.Res., 1992, 97 :20455-20468. doi: 10.1029/92JD01411 [9] Rahman H, Pinty B, Verst raete M M, et al.Coupled surface-atmosphere reflectance (CSAR) model 2 :semiem piricalsurface model usable with NOAA advanced very high-resolution radiometer data.J.Geophys.Res., 1993, 98(D11):20791-20801. doi: 10.1029/93JD02072 [10] Wu Aisheng, Li Zhanqing, Cihler J, et al.Effects of land cover type and greenness on advanced very high resolution radiometer bi-directional reflectance:analysis and removal.J.Geophys.Res., 1995, 100(D5):9179-9192. doi: 10.1029/95JD00512 [11] Rao N C R, Chen J.Post-launch calibration of visible and near-infrared radiometer on the NOAA-14 spacecraft.Int.J.Remote Sens., 1996, 17 :2743-2747. [12] 周秀骥, 陶善昌, 姚克亚.高等大气物理学.北京:气象出版社, 1991.11. [13] Kaufman Y J, Holben B N.Calibration of the AVHRR visible and near-infrared band by atmospheric scattering, oceanglintand desert reflection.J.Applied Meteor., 1990, 29 :170-202. [14] Privette J L.Estimating spectralalbedo and nadir reflectance through inversion of simple BRDF models with AVHRR/Modis-like data.J.Geophys.Res., 1997, 102(D24):29529-29542. doi: 10.1029/97JD01215 [15] Duchemin B.NOAA/ AVHRR bi-directional reflectance :modeling and application for monitoring of atemperate forest.Remote Sense.Environ, 1999, 67 :51-67. doi: 10.1016/S0034-4257(98)00080-7 [16] Dutchmen B.Monitoring phonological key stages and cycle duration of temperate deciduous forest ecosystems with NOAA/AVHRR data.Remote Sens.Environ., 1999, 67 :68-8. doi: 10.1016/S0034-4257(98)00067-4 [17] 王永生主编.大气物理学.北京:气象出版社, 1987.370-379. -
下载:
图(3) / 表(5)
计量
- 摘要浏览量: 4192
- HTML全文浏览量: 576
- PDF下载量: 1856
- 被引次数: 0
