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For the remote areas like the Longitudinal Range-Gorge Region(LRGR),it is hard to measure the sus- pended 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.
This is attempted to estimate SSC by employing the three atmospheric correction methods: COST, iCOST (modified from (TZ), and it uses Band 5 to eliminate the path radiation of Bands 1- 4.The water surface reflectance at Band 4 obtained using TZB5 has a extends 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 also also effective in the Middle Yangtze River.