摘要
在分析固有光学参数和表观光学参数之间关系的基础上,提出一种提高悬浮物浓度的反演精度的算法。本文算法细化单位散射系数曲线的斜率s’值,并将b'bp(λ)×b*p(λ)视为一个一定数值范围内的变量,其中b’bp(λ)为波长λ处的悬浮物后向散射概率,b*p(λ)为悬浮物的单位散射系数。以太湖为实验区,进行了水体野外实测,获得了遥感反射率、吸收散射系数、后向散射系数、悬浮物浓度等必要参数。利用本文改进算法反演悬浮物浓度的平均相对误差绝对值为22.58%,均方根误差为13.12mg/L,均小于已有研究中将涉及的相关参数看做单一定值时,取得的平均绝对误差(44.78%)和均方根误差(31.57mg/L)。
On the basis of analysis of relation between inherent optical parameter and apparent optical parameter,this pa- per gave an algorithm for improving inversion precision of float concentration. The algorithm in this paper refined spe- cific scattering coefficient curve slope s＇ value, saw bbp（λ）×bρ（λ）as a specific scattering coefficient of float, in which b＇ bp（λ）is back scattering probability of float at wavelength λ, and b＊p （λ）specific scattering coefficient of float. With the Tai Lake as test area for field measurement on water body, such requisite parameters were obtained as remote sens- ing reflectivity, absorption and scattering coefficient, back scattering coefficient and float concentration. This improved algorithm gave inversed average absolute relative error of float concentration at 22.58%, root- mean- square error 13.12mg/L, both lower than 4.78% and 31.57mg/L respectively in relevant studies in which relevant parameter is seen as a single fixed value.
出处
《安徽地质》
2013年第4期295-298,共4页
Geology of Anhui
关键词
悬浮物浓度
近红外波段
生物光学模型
反演模型
float concentration
near infrared band
photobiological model
inversion model
