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Similar to layer stack feature in ERDAS what functionality is available in GRASS. I am aware of r.composite, but it can accept only 3 layers. To obtain a stack of more than 3 layers what can be done?

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You want to use r.patch instead (r.composite accepts only 3 layers since it is dealing with RGB maps).

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    Make sure you check on each layer's resolution and your current region settings before using either r.composite or r.patch.
    – maning
    May 17, 2011 at 10:22
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try gdal_merge.py command ( in qgis--rast menu)

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