遥感可见光波段的水体透视深度研究

A STUDY ON REMOTE SENSING PERSPECTIVE DEOTH INTO WATER IN VISIBLE BAND

可见光对水体具有一定的穿透能力,有必要对其穿透深度作定量的分析评价。本文在分析前人提出的阳光穿透深度 Z_(90)的基础上,综合考虑水体组成状况、大气条件和传感器接收特性等因素,提出了遥感透视深度 Z_R 的慨念,并推导出 Z_R 与 Z_(90)的关系式。用 Landsat MSS 磁带数码计算以及用Monte-Carlo 法模拟低增益 Landsat 3号 MSS4、MSS5波段在水体含有不同悬浮泥沙和叶绿素浓度下 Z_R 的数值大小。结果表明,在许多情况下 Z_R 与 Z_(90)有较大差异、

It is highly necessary to estimate correctly the remote sensing perspective depth in visible regions as sunlight is capable of penetrating water to some extent.The sanlight penetration depth put forward by Gordon et al only con- siders the optical characteristic of water body;The new concept of remote sen- sing perspective depth is defined,and an effort is made to deduce the relation- ship between both depths considering water optical property,atmospheric condition,receiving and recording characteristic of sensor and human interpre- tation level in an all-round way.The compatation using magnetic tape code of low gain Landsat MSS4,MSS5 and the computation using Monte-Carlo algori- thm of remote sensing perspective depth are made with different suspended matter and chlorophyll concentrations