如何使用ArcGIS裁减多波段图像

To use this procedure a masking dataset that covers the area to be clipped is required. The dataset may be a raster or a polygon feature class and should be in the same coordinate system as the raster being clipped.<BR><BR>
<OL>
<LI>Add the individual bands of raster to ArcMap. Do not add the raster as a multiband. Each band should be its own separate layer in ArcMap's Table of Contents.
<LI>Add the masking dataset to ArcMap.
<LI>Navigate to Spatial Analyst > Options.
<LI>On the General tab set the Working Directory. <BR><BR>
The path to the Working Directory may not have any spaces. For example, a folder called 'My Documents' may cause an error, but 'My_Documents' does not.<BR>
<LI>On the General tab set the Analysis Mask to the masking dataset.
<LI>On the Extent tab set the extent to the masking dataset.
<LI>On the Cell Size tab set the cell size to the clipping raster.
<LI>Click OK.
<LI>Open Spatial Analyst > Raster Calculator.
<LI>Double-click on the first band in the Layers list. This will put the band into the expression box below.
<LI>Click Evaluate. A new calculation layer will be added to ArcMap's Table of Contents.
<LI>Repeat Steps 10 and 11 until all bands of the raster have been clipped.
<LI>Right-click on each new calculation layer and save it to a raster dataset with Make Permanent.
<LI>Open Spatial Analyst > Raster Calculator.
<LI>Use the MAKESTACK function to make an ESRI Grid Stack from the calculation layers. </LI>
<LI>Where <outstack> is a name for the output stack and <band1>, <band2>, <band3> are the calculation layers. </LI>
<LI>Optionally, the output stack may be converted to a TIFF, IMG or ArcSDE Raster in ArcCatalog. </LI></OL>

<P>very good , thank you very much</P>

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