I need to create a calculation attribute rule that takes values from two different feature classes.
For example, there are two feature classes: "woodland" and "openSpace". These two feature classes have a common column "id" that I can join them by. Both of these feature classes also have "area" field (with an immediate calculation rule for this already set up) - calculating the area within each id.
I have a field "totalArea" in "woodland" feature class, and I need to sum the area fields from both "woodland" and "openSpace" into the "totalArea" with an Arcade expression - so every time the geometry is updated in either of these feature classes, I do not need to calculate fields to get updated areas - including for "totalArea".
I am fairly new to Arcade but expecting that this is going to be a simple expression to set up. I cannot seem to find an answer on how to achieve this.
Thank you.
