What will the expression Con("elevm" > 30, 1) return if the condition is false?

In this scenario, the expression Con("elevm" > 30, 1) utilizes a conditional function. The function is designed to evaluate a condition, which in this case checks if the value of "elevm" is greater than 30. If the condition is true, the function would return the value specified (which is 1), while if the condition is false, the function evaluates what it should return in that case.

When the condition is false, specifically in many programming contexts including GIS applications, sometimes no specific value is assigned to be returned, leading to a scenario where the function effectively returns nothing or null. This behavior can be context-dependent, but in the context of GIS and similar evaluation functions, it is reasonable to conclude that if the condition is not met, the value remains unaltered or undefined.

Thus, when the evaluated condition "elevm" > 30 is false, the expression leads to a situation where no output is generated, aligning with the interpretation that it "returns nothing."