I am wondering if there is a way/tool in QGIS (2.6) could produce similar output as ArcGIS "Combine" tool does. I am trying to integrate values from overlapping rasters, and then create a single raster with unique value for each unique combination of input values. If there is a tool in QGIS could be used to get that will be the best. If not, should I using a script to automate reading through each pixel values? I am afraid it will take a large amount of time to processing national-wide data.
Here is the link to document for the "Combine" tool: http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/combine.htm