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Is there a reasonable Stack Exchange site to ask about data visualization questions, that are not related to the programming of visualization software/libraries, but rather the best way to present a certain type of data in a visualization?
For example; a question might be
"How do I best represent a timelapse heatmap of two different data sets, and the differences between the two?"
Is there any site where this would be on-topic? If there are multiple, what is the best site to ask it on?
This question is completely on-topic on the CrossValidated SE and the DataScience SE, as it asks about the representation of data sets on a heat map.
You can ask about the relevance in the site's meta.
And as the comment above says, data visualization is indeed on-topic on CrossValidated. So, it is better suited there, than on the DataScience SE.
User Experience seems to be what you are looking for. It's about Specific UX design problems which is what that seems to be, for instance the site has a heatmaps tag with several questions.
As always be sure to check out the help centre first. If you're still not sure even after that, you could always ask on the site meta whether your question is on-topic.
Graphic Design allows questions about the non-programmatic aspects of data visualizations.
