[求助]ImathOp和ImapAlgebraOp的区别

 
<P><FONT face=黑体 size=4>第一问题：</FONT><BR>Dim pMathOp As IMathOp<BR>Set pMathOp = New RasterMathOps  ‘数学运算 </P>
<P>Dim pMapAlgebraOp As IMapAlgebraOp<BR>Set pMapAlgebraOp = New RasterMapAlgebraOp   ’地图代数运算</P>
<P> 数学运算和地图代数运算两者的功能差别？请告知</P>
<H1><FONT face=宋体 size=3>第二问题BindRaster Method (</FONT><a href="mk:@MSITStore:C:\Program%20Files\ArcGIS\DeveloperKit\Help\VB\esriSpatialAnalyst.chm::/SpatialAnalyst_library.htm" target="_blank" ><FONT face=宋体 size=3>esriSpatialAnalyst</FONT></A><FONT face=宋体 size=3>)</FONT></H1>
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<P>    Binds a symbol to a GeoDataset. </P>
<P>  <I>object</I>.<B>BindRaster</B> <B>(</B><I>geoDataset</I>, <I>symbol</I><B> )   其准确含义是什么？谢谢各位！</B></P>