Proximity to polygon edge

[lukepighetti]

I'd like to be able to query the two closest polygon edges to a single point. Any ideas?

Use case: tell the user which country border they are closest to. "You are 15km from the France/Germany border!"

[synw]

An idea: if you have the polygon's centroids your could get the closest polygons with a cheap points distance calculation ( https://github.com/wingkwong/geodesy#distancebetweentwogeopointslatlng-l1-latlng-l2-num-radius ). Then you can get the closest point in these polygons