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I recently started with GIS and I am learning as I go about implementing things.
Take the case of JHU Dashboard or the first world map in this NYT article or the maps in this Guardian article, what I do not yet understand is how do they decide the radius of the bubble on the maps?

In some maps I can see a discrete nature of radius like -
enter image description here

But what I do not understand is that we do not know the upper limit of the numbers we would end up mapping. Moreover in most of the maps it is not discrete but continuous.

Especially for me, I made a website too where I display India's infections as an iframe. I arbitrarily multiply the cases with 2000 to make them look good on the screen. But then a few days ago the numbers went up a lot and now everything looks out of proportion even after reducing the multiplying factor from 2000 to 1500.

I just feel very bad about not knowing how to correctly represent this data.

Additional Info -
I use folium to make an html which I embed as iframe. Folium uses Leaflet internally.

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    One of the main policies of this site is focused question, which means one question per question. Please edit your question and limit it to only one question. – TomazicM Apr 3 '20 at 8:41
  • @TomazicM sorry about that. Deleted them. – jar Apr 3 '20 at 8:46
  • @TomazicM I have removed the secondary questions – jar Apr 3 '20 at 9:40
  • It looks like this question is more suitable for data visualization at Stats site: stats.stackexchange.com/questions/tagged/data-visualization. It has no clear GIS part. – TomazicM Apr 3 '20 at 9:47
  • Can you migrate it to that site? I don't have the reputation to do that. If I ask another question there then it will be flagged since I have asked it here too. – jar Apr 3 '20 at 9:52

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