基于星载数据的水库水质遥感监测研究

Water Quality Mapping Using In-situ Measurements and Landsat-5 TM Satellite Data

以吉林长春石头口门水库这一重要水源地作为研究区,在现场实测的基础上采用Landsat-5 TM卫星影像作为水质反演的数据源,实现水质参数空间反演.地面数据在TM过境当天2007年8月29日于石头口门水库采集所得.用经验模型生成水质参数叶绿素a的空间分布图,并对水库的营养状态实施评估.几何校正、辐射定标、大气校正、图像滤波以及水质图生成等图像处理步骤在软件ENVI4.8与ARCGIS9.3中实现.结果显示同步的地面实测参数与卫星遥感数据高度相关(R2=0.87).石头口门水库的叶绿素a浓度平均值为14.6μg/l,处于中度富营养化水平.

In this paper an application of water quality mapping was presented using real-time satellite and ground truth data. The Reservoir Shitoukoumen which is one of the largest fresh water lake and drinking water resource in the City of Changchun was selected as the study area. Landsat-5 TM satellite image is used as remote sensing data source for water quality mapping in addition to simulta- neously performed in-situ measurements. Ground data is collected simuhaneously with the TM sensor overpass on August 29, 2007 over the Reservoir Shitoukoumen. The spatial distribution map is developed by using conventional regression technique for water quality pa- rameter, which is chlorophyll-a （chl-a）. The results indicate that simultaneous ground and satellite remote sensing data are highly correlated （R^2 〉 0.86）. In the image processing step, geometric correction, image filtering and development of water quality map proce- dures are performed with the ENVI 4.8 and ArcGIS 9.3 software package. The trophic status of Reservoir Shitoukoumen is considered to be mesotrophic with an average 14.6 μg/l chl-a concentration.