7d9b4a68__and_Dynamic_Raster_Mosaicking__Description
[Function] Arithmetic [Uses] Typically used to merge different bands of imagery together or apply conversions, for example, to compute radiance values. [Description] 
Performs an arithmetic operation between two partially or completely spatially overlapping rasters or a raster and one or more constant values.
On-the-Fly Processing and Dynamic Raster Mosaicking
Description