Processing of grid superposition nodata in ArcGIS

The two grids are superimposed. Sometimes there is a part of the data that does not exist, that is, click this area with identify, and the value is nodat.
A, instead of having a value like other non-empty regions.

Note that the nodata area must be assigned a value of 0, because nodata + any number = nodata, so use the conditional query function
The value of nodata is 0.

The method is arctools-> Spatial Analyst tools-> Map Algebra-> Single Output map algebra.
AlgorithmThe expression is con (isnull ([raster]), 0, [raster]). [Raster] indicates the name of the input grid.
A Raster image in the range of an external rectangle of the input Raster image is automatically generated, and the non-empty area is the raster value,
The value of nodata is 0. If the nodata area with a value of 0 is greater than the external rectangle
In the output Map Algebra dialog box, environment-> General setting-> extent, set the required mask.

Then you can directly use spatial analysis-> raster calculate for calculation.