How to use Set Null in Model Builder?

Question

I am trying to emulate the raster calculator that takes a flow accumulation raster and turns it into a stream raster. Where the number "849840" is the threshold value.

How would I use the Set Null tool in the model builder that will give me the same results?

What would I put in the fields?

curtvprice · Answer

Alternatively, you can add the Raster Calculator tool in Model Builder and use it the same way you used it interactively.

ChrisDonohue__GISP · Answer

If I remember correctly, SetNull (Spatial Analyst) would be done like this to complete your task:

The Input Conditional Raster:  dem_fa .  (your source raster to operate on)

Expression (optional) would be:  VALUE > 849840 .  (values above 849840 are evaluated by the tool as True, so will become Null)

Input File raster or constant value: 1 .  (constant value to set if False/Not Null, ie your streams will have a value of 1)

Output raster:  (your output file name goes here)

Note:  be sure to set the Environments (button at bottom of tool).  Also, I would avoid using the Default Geodatabase (Default.gdb) and instead set up a geodatabase specifically for this data and its processing.

Chris Donohue, GISP