基于VIIRS数据的南黄海区域激光测深性能评估

Performance evaluation of laser bathymetryin the South Yellow Sea region based on VIIRS data

机载激光测深技术因其特有的优势备受关注,但现阶段其探测能力有限,为解决其适用范围问题,本文利用VIIRS(Visible Infrared Imaging Radiometer Suite)数据对南黄海区域的激光测深性能进行评估,首先利用外业实测数据和卫星影像反演南黄海区域的490nm波段漫衰减系数,其次建立490nm和532nm波段漫衰减系数之间的线性关系,最后以CZMIL(Coastal Zone Mapping and Imaging LiDAR)系统为例评估了南黄海区域激光测深能力,并给出了江苏沿岸海域CZMIL系统的适用范围。研究结果表明:CZMIL系统在南黄海区域的最大测深能力范围为0.5～40m;理论最低潮面时,江苏沿海海域CZMIL系统的适用范围约为4 700km^2。

Airborne laser bathymetry gets a lot of attention because of its unique advantages.But its detection capability is limited at present.In order to solve the problem of its applicability,VIIRS data were used to evaluate the performance of laser bathymetry in the South Yellow Sea region.Firstly,the diffuse attenuation coefficients of 490 nm band in the South Yellow Sea region were retrieved by using field measured data and satellite images.Secondly,the linear relationship between diffuse attenuation coefficients of 490 nm band and 532 nm band was established.Finally,taking CZMIL system as an example,the ability of laser bathymetry in the South Yellow Sea region was evaluated,and the applicable range of CZMIL system along the coast of Jiangsu Province was estimated.The results show that the maximum sounding capability of the CZMIL system in the South Yellow Sea region is about 0.5-40 meters,and the applicable range of CZMIL system in the coastal waters of Jiangsu Province is about 4 700m^2 when the water surface is at the theoretical the lowest low water.