[求助]water quality classifications

<P>hi, recently i have a project by using the CHRIS images (manly beach, a beach in Sydney) to identify the water quality based on ENVI. All the images are captured by different time and with different looking angles.(-55~+55), i think it is possible to figure out some other information just like coastline contours map and the wave pattern. however i have no idea about how to do that. anyone can give some suggestion?</P>
<P>cheers!</P>

<P>envi提供了很多种分类方法了，具体你可以看看envi那本教程了</P>
<P>偶对水质方面不太懂：（</P>
<P>这里有些资料下载：）</P>
<P>ftp://ftp.westgis.ac.cn/数字流域论坛/遥感版/ </P>

<P>thanks, normally I use spectral angle mapping to classify, but the problem is that i need to import the spectral library to identify the different objects, however you konw these spectral signatures are always changing. Anyway, thank you for your message.</P>
<P>cheers!</P>