摘要
为象纵的范围峡区域(LRGR ) 一样的遥远的区域，它是难的测量推迟的沉积集中(SSC ) 。这研究试图由采用三个大气的修正方法估计 SSC：费用， iCOST (从费用修改了) 并且 TZB5 (最新求婚了) 。TZB5 能更精确地从太阳的天顶角度(TZ ) 沿着太阳地面表面路径(TAUz ) 决定大气的发射度，并且消除乐队的路径发光使用乐队 5 14。在 4 获得了使用 TZB5 的乐队的水表面反射在 03000 mg/L 的范围以内与 SSC 有一种更强壮的关系。发达算法能精确地在混浊的上面的长江从 ETM+ 图象直接估计 SSC，并且在中间的长江也是有效的。
For the remote areas like the Longitudinal Range-Gorge Region （LRGR）, it is hard to measure the suspended sediment concentrations （SSC）. This study attempted to estimate SSC by employing the three atmospheric correction methods： COST, iCOST （modified from COST） and TZB5 （newly proposed）. TZB5 can more accurately determine the atmospheric transmittance along the sun-ground surface path （TAUz） from the solar zenith angle （TZ）, and it uses Band 5 to eliminate the path radiance of Bands 1 - 4. The water surface reflectance at Band 4 obtained using TZB5 has a stronger relation with SSC within the range of 0--3000 mg/L. The developed algorithms could accurately estimate SSC directly from ETM＋ images in the turbid Upper Yangtze River, and were also effective in the Middle Yangtze River.
基金
Supported by the National Basic Research Program of China(Grant No.2003CB415105-6)
National University of Singapore(Grant No.R-109-000034-112)
关键词
长江
生态系统
修补措施
水质
image-based atmospheric correction, suspended sediment concentration （SSC）, Landsat ETM＋ image, turbid water, the Upper Yangtze River
