基于Crosta方法的珠江口总悬浮物遥感异常信息提取研究

Study on Remote Sensing Abnormal Information Extraction of Total Suspended Matter in the Pearl River Estuary Based on Crosta Method

指出了水体总悬浮物浓度是水质评价的重要参数之一,通过遥感影像和实测总悬浮物浓度建立的总悬浮物浓度定量遥感反演模式在区域应用上往往具有局限性。基于Crosta方法,利用波段组合TM1、TM2、TM3、TM4和TM1、TM2、TM3、TM4、TM5和TM7提取了水体总悬浮物遥感异常信息。结果表明:两组波段组合的主分量PC1可以作为水体总悬浮物浓度遥感异常信息的指示分量,并且利用MERIS总悬浮物浓度产品数据对该指示分量做了验证。该研究结果可以为缺乏实测数据的河口和内陆水体提供一种新的研究水体总悬浮物浓度的思路。利用长时间序列的Landsat TM影像数据,从宏观角度研究内陆水体总悬浮物浓度的时空分布和动态变化等。

Total suspended matter(TSM)concentration is one of the most important parameters for the assessment of water quality.The quantitative remote sensing inversion model of TSM concentration established by remote sensing images and measured TSM concentration often has limitations in regional application.Band combination of Landsat TM1,TM2,TM3,TM4and TM1,TM2,TM3,TM4,TM5,TM7 were used to extract remote sensing abnormal information of TSM based on Crosta method.The results show that the first principal component(PC1)of two set of band combinations can be used to represent the remote sensing abnormal information of TSM.This indicator(PC1)was also validated using MERIS TSM product data.The results of this study can provide a new idea for studying the concentration of TSM in estuary and inland waters,where field TSM data was unavailable.In addition,this indicator can also be used to study the spatial distribution and dynamics of TSM from long-term Landsat TM archives.