How to make a width of "200 feet" in KML with a line?

Question

Assuming I have two latitude longitude points that make a Line, what is the proper "conversion" such that I can make it such that the line is stroked in a way that makes it a total of "200 feet" in width? (100 ft on both sides of the line)?

Answer 1

KML reference

<gx:physicalWidth>
Physical width of the line, in meters.

Whether that is supported or not will depend on what tool you are using to render the KML.