Performing QGIS modeler multiple raster calculations with data from external CSV?

Really old post but I guess a possible solution is to, unfortunately for your case, use a script in your modeler which:

• Retrieves the names all loaded raster layers.
• Iterate through the metadata which contains a column with raster names.
• Matches the loaded raster names with those in the metadata.
• If any matches are found, the raster's corresponding value is extracted.

1. You can create a script from:

   Processing Toolbox > Scripts > Tools > Create new script 

   Then use something like the following which:

   ##Example=name ##Table=table ##Field=Field Table ##Output_value=output Number from qgis.core import QgsMapLayer, QgsMapLayerRegistry import csv raster_list = [layer.name() for layer in QgsMapLayerRegistry.instance().mapLayers().values() if layer.type() == QgsMapLayer.RasterLayer] with open(Table) as f: reader = csv.reader(f) for row in reader: for raster in raster_list: if raster in row[0]: Output_value = row[1] print Output_value 

2. Then add the script into your modeler (I made a simple example with just two inputs):

   

   If I run this model using the script above, it simply prints the output value from the metadata which corresponds to the name of the raster:

   

3. Depending on how your model is contructed and possibly tweaking the script, you could perform your multiple raster calculations.