I have 7 bands of Landsat and I would like to combine all layers into one layer.
Can ArcMap 10 do this like Erdas software can?
You need to use the Composite Bands ArcGIS Geoprocessing tool.
According to the ArcGIS Help,
This tool can also create a raster dataset containing subset of the original raster dataset bands. This is useful if you need to create a new raster dataset with a specific band combination and order.
Go to the following steps if you have ArcGIS 10:
The files you have selected will be stacked into a one composite layer with colors and bands combination.