基于MODIS数据的云南抚仙湖星云湖水质污染遥感调查方法研究

A study of remote sensing investigation for water quality pollution of the Fuxian and Xingyun Lakes in Yunnan Province using MODIS data

摘要: 水质遥感监测方法可以反映水质在空间和时间上的分布情况和变化,满足目前对水质调查实时、大尺度的评价要求。文章以云南抚仙湖星云湖为研究区,将实测的叶绿素a浓度、悬浮物含量和MODIS遥感数据各波段比值进行相关分析,结果表明:MODIS数据250m分辨率的r2/r1的波段组合能够较好地反演叶绿素a浓度,而500m分辨率的(r4-r3)/(r4+r3)的波段组合对于悬浮物浓度的反演能力最好。通过对它们进行回归关系分析,得到适合抚仙湖星云湖的遥感定量模型。

Abstract: Remote sensing monitoring of water quality is capable of showing the distribution and variation of water quality in space and time and meets the demand of large-scale and real-time water quality assessment.In this paper,the spectral characteristics of Fuxian and Xingyun Lakes water are studied by analyzing the field spectra measurements.The observed of Chlorophyll-a(Chl-a) concentration,Suspended Sediment(SS) concentration and MODIS band combination were compared.The results show that the ratio of band 2 to band 1(r2/r1) with 250 m resolution is suitable to retrieve Chl-a concentration,while the proportion of sum-difference band 4 to band 3(r4-r3)/(r4+r3) with 500 m resolution is related closely to SS concentration.Utilizing the best band combinations,semi-empirical retrieval models for Chl-a,the SS concentrations are composed in the Fuxian and Xingyun Lakes.