Maintain M and Z coordinates in ol.geom.Circle#getClosestPoint
Linearly interpolate extra dimensions in ol.geom.flat.closestPoint
Preserve extra dimensions in ol.geom.Point#closestPointXY
Preserve extra dimensions in ol.geom.MultiPoint#closestPointXY
Correct month calculation in ol.format.IGC
Display interpolated time in igc example
Merge pull request #1550 from twpayne/closest-point-interpolation

Preserve extra dimensions in closest point calculations