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What method does the Measure tool in the ArcGIS Online map viewer use to create measurements?
The Measure tool in ArcGIS Online uses the Geodesic method, which takes into account the curvature of the earth to create accurate measurements.
Geodesic measures the shortest line between any two points on the earth's surface based on a spheroid (ellipsoid).
When measuring in a data frame with a projected coordinate system, the default measurement type is Planar, which does not take into account the curvature of the earth.