[Qgis-user] Less Ambiguous Legends for Continuous/Gradient Variables

Mike Treglia mtreglia at gmail.com
Tue Jan 3 11:15:39 PST 2023


Hi All,

Happy New Year!  Quick question that has come up various times, and never
asked here for some reason:

With legends for continuous variables, as generated by QGIS, the values for
class boundaries tend to be a bit ambiguous, in that its not clear whether
a unit with that value would fall in the upper or lower bin of data due to
how the numbers are represented. For example, with a 2-class legend as
follows, this might be the case:
0-1
1-2

Confusion could be avoided by using more precise values and adjusting the
bins (possible in QGIS by unlinking class boundaries and manually adjusting
ranges) - e.g., it would look like something this:
0.0-0.9
1.0-2.0

Or it could be clarified with different symbology such as below, but I
don't believe this is available in QGIS:
0.0 < x <= 1
1 < x <= 2

Am I missing any way to more automatically address this in QGIS via
existing tools, either built-in or via a Plug-In?  I've seen a bug report
on this front, but it looks like its still open (albeit there's a potential
solution within the thread) - https://github.com/qgis/QGIS/issues/29852.

Thanks! Knowing there are so many sharp QGIS users out there, I imagine
others have figured out great approaches that I'm just behind on.

Mike
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