Please cite SAGA whenever you use it for your publications:

Fill gaps of a grid with data from another grid. If the target is not set, the changes will be stored to the original grid.

Name	Type	Identifier	Constraints
Input
Grid	grid, input	ORIGINAL
Patch Grid	grid, input	ADDITIONAL
Output
Patched Grid	grid, output, optional	COMPLETED
Options
Resampling	choice	RESAMPLING	Available Choices: [0] Nearest Neighbour [1] Bilinear [2] Cubic 1 [3] Cubic 2 Default: 3