ee.Feature.closestPoints

Returns a dictionary containing up to two entries representing a point on each input feature's geometry that is closest to the geometry of the other input. If either geometry is empty, an empty dictionary is returned. If both geometries are unbounded, the dictionary has an arbitrary point for both 'left' and 'right'. If one geometry is unbounded, the dictionary has an arbitrary point contained in the bounded geometry for both 'left' and 'right'.

Usage	Returns
Feature.closestPoints(right, maxError, proj)	Object

Argument	Type	Details
this: left	Element	The feature containing the geometry used as the left operand of the operation.
right	Element	The feature containing the geometry used as the right operand of the operation.
maxError	ErrorMargin, default: null	The maximum amount of error tolerated when performing any necessary reprojection.
proj	Projection, default: null	The projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere.