multiply two rasters but ignore no data values from first raster

Question

Attached is a pdf depicting what I need to do with 2 raster layers.  This has to be an easy task but I can't find a tool that won't combine all the no data cells in the output raster.  For example, if a cell in raster 1 is 'no data' and the associated cell in raster 2 has a value of '8', I want that cell in the output file to be 8.  All the tools I looked at would assign that cell as 'no data'.

example.pdf

IMG_20200630_134641_.jpg

KansasGeologicalSurvey_0-1780094050708.png

ArfanaraNajnin · Answer

For multiplication is that command OK, Or it's for adding two raster?
Con( IsNull( [Raster1] ), 0, [Raster1] ) + Con( IsNull( [Raster2] ), 0, [Raster2] )

For Multiply we should use the * (multiplication) Symbol as normal math, isn't it?
So the expression may be this one if I am not wrong.
  'Con( IsNull( [Raster1] ), 0, [Raster1] ) * Con( IsNull( [Raster2] ), 0, [Raster2] )'

Regrads,

Najnin

GaryYoung · Answer

Con( IsNull( [Raster1] ), 0, [Raster1] ) + Con( IsNull( [Raster2] ), 0, [Raster2] )

will do it.

Where do I use that conditional statement?  I do not do python.

The reclassify suggestion offered will not work for me, as it will not preserve the unique values of all the other cells, it will lump them into a small set of new values.

Gary

JoannaWhittier · Answer

Thank you!