Available with Spatial Analyst license.
The relational math tools compare the values of inputs and return the results as a Boolean value of 0 for False and 1 for True. The input rasters are tested on a cell-by-cell basis.
There are six tools for performing relational logical operations: Equal To, Not Equal, Greater Than, Greater Than Equal, Less Than, and Less Than Equal.
Relational tool logic
Equal To
If both values are equal, the output is 1. If the values are not equal, the output is 0.
Input1 = Input2, Output = 1 Input1 ≠ Input2, Output = 0
Not Equal
If both values are not equal, the output is 1. If the values are equal, the output is 0.
Input1 = Input2, Output = 0 Input1 ≠ Input2, Output = 1
Greater Than
If the first input is greater than the second, the output is 1. If not, the output is 0.
Input1 > Input2, Output = 1 Input1 = Input2, Output = 0 Input1 < Input2, Output = 0
Greater Than Equal
If the first input is greater than or equal to the second, the output is 1. If not, the output is 0.
Input1 > Input2, Output = 1 Input1 = Input2, Output = 1 Input1 < Input2, Output = 0
Less Than
If the first input is less than the second, the output is 1. If not, the output is 0.
Input1 > Input2, Output = 0 Input1 = Input2, Output = 0 Input1 < Input2, Output = 1
Less Than Equal
If the first input is less than or equal to the second, the output is 1. If not, the output is 0.
Input1 > Input2, Output = 0 Input1 = Input2, Output = 1 Input1 < Input2, Output = 1
NoData handling
If any of the input cell values is NoData, the output value will be NoData.