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How about creating a filter that lets the user focus on a specific area? When using a filter, marks outside the filter (or you can think of that as your "zoom") will not be included for the size, so your marks will be sized according to the measure you are using, based on only the marks still included in the filter.
Thanks Matthew for your swiftness !
You are right, your solution works in most cases.
Here it doesn't since I do not have such a field able to filter on a specific zone.
I basically only have lat long fields...