nearestCoordinate

Determines the nearest point in the input geometry to the input point using a simple planar measurement. Input geometry of type Envelope is not supported. To find the nearest coordinate on an Envelope, convert it to a Polygon first using GeometryEngine.boundaryOrNull(Geometry).

If the specified geometry is a polyline or polygon the nearest coordinate is the closest point in a segment that comprises geometry; it may not necessarily be the closest vertex of a segment. If you want to obtain the closest vertex in the polyline or polygon use the GeometryEngine.nearestVertex(Geometry, Point) method instead.

This calculation uses 2D Cartesian mathematics to compute the nearest coordinate. It is based upon the SpatialReference of the input geometries. If the input geometries do not use an 'distance preserving' spatial reference, the result can be inaccurate. You have two options available to calculate a more accurate result:

• Use a different spatial reference. Use the GeometryEngine.projectOrNull(Geometry, SpatialReference) method to project the geometry to a projected coordinate system that is better suited for area calculations. See Spatial references[https://developers.arcgis.com/documentation/spatial-references/] and Supported map projections[https://pro.arcgis.com/en/pro-app/latest/help/mapping/properties/list-of-supported-map-projections.htm] for more information.

• Use the geodetic equivalent, GeometryEngine.nearestCoordinateGeodetic(Geometry, Point, Double, LinearUnit).

Supports true curves.