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I have what I hope is a simple question. I'm doing convex hull calculations. What I have is area(convex_hull($geometry)).

I get a number and that's all well and fine. Since I need to get a ratio of that area with the original polygon, I need to know what units the convex hull area is in. Does anyone have an idea on this?

Also, am I doing something naive?

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    The same units as the features that generated the convex hull.. what did you create it from? – Michael Stimson Oct 17 '17 at 2:17
  • NAD 83. This makes me think I need to recheck the area of the feature to make I didn't do something weird. I figured that's what the units were, it's just that the comparison between one and the other made no sense. – Dagoski Oct 17 '17 at 2:33
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This has to do with the difference between area($geometry) and $area. Once I used the former, I get numbers that make sense.

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