You will need a distance calculation in order to do this. I cannot copy and paste from here due to security, but you can search the topic on Google or this forum. I also have a dashboard on Tableau Public that you can search for. It shows radius circles around Indiana BMV locations. You can download this and see how I have done all of this.
Tim, I took a look at your map. The outcome is a bit different from what I'm trying to achieve. Your map draws the radius based off of a drop-down selection. For the map I'm working on I need all of the radiuses to be visualized at once to show what a true service coverage looks like. Each location has a unique radius based on geographic limitations or facility limitations.
All you have to do is replace the parameter used in mine with the field in yours.
Also go to this study on concentric circles. Richard is a true master of this stuff. Www.community.tableau.com/thread/117325<http://Www.community.tableau.com/thread/117325>
Sent from the iPhone of Timothy Dines.