OptionalmM coordinate which contains measures used for linear referencing.
OptionalspatialThe spatial reference can be defined using a well-known ID (WKID) or well-known text (WKT).
X coordinate which is measured along the east/west axis.
Y coordinate which is measured along the north/south axis.
OptionalzZ coordinate which measures height or elevation.
Defines the JSON formats of the point and spatial reference objects. See https://developers.arcgis.com/web-map-specification/objects/point_geometry/. See https://developers.arcgis.com/web-map-specification/objects/point_geometry/.