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I'm using QGIS Version 3.16.4. I thought one can do heatmaps by going to the properties of a layer and selecting it under symbolization. But as you can see, it's not available in the dropdown menu. Does anyone know what's the reason for that or how I can activate the heatmap option? The Vector-Layer only consists of polygons which have 3 attributes, so nothing fancy there. Maybe there's a plugin I can use? The two which I found need a timestamp unfortunately, which is not part of my layer Layer properties -> symbolization

I know you can do something similar by using graduated in the drop down menu, it's explained in this thread but I still want to know why I can't do it with heatmaps.

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    Heatmaps are available for point layers only. Covert yout polygons to points, e.g. using Menu Processing / Toolbox / Geometry by expression with this expression: centroid ($geometry) – Babel Mar 29 at 15:20
  • oh, did not know that, thanks. Well that's a bit disappointing, I don't see any reason why it shouldn't be available for polygons...Guess I'll use graduated then or convert to points – Jonas Mar 29 at 15:22
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    The very concept of a heatmap is based on points as it is a kind of representing density, each point having a radius (kind of a buffer) so that it overlaps the symbols of other features. You could emulate that using buffers and layer/feature blending modes with polygons – Babel Mar 29 at 15:24
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Heatmap renderer is only available on point vector layers.

But you probably don't want a heatmap, you probably want a graduated symbology (which I think is your Abgestuft option), which you can use to make the polygons more red based on an attribute.

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    Yes, thank you. I knew about the graduated symbology, just didn't know heatmaps are for point layers only :) – Jonas Mar 29 at 15:23

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