shrug-l: RE: Determining radius of an Arc

O'Rourke, Paul Paul.ORourke at
Tue Apr 5 15:39:23 EDT 2011

Hi Tripp,

I have been able to derive the radius of a curve using input geometry by utilizing the IConstructCircularArc and ICircularArc interfaces in ArcObjects.  The ICircularArc interface includes a Radius property.  Outside of ArcObjects, I'm not sure how you would do it.


Paul O'Rourke
Transportation Statistics Office
Manager, GIS Support Section
paul.orourke at
Safety is no accident

From: shrug-l-bounces at [mailto:shrug-l-bounces at] On Behalf Of Tripp Corbin
Sent: Tuesday, April 05, 2011 3:10 PM
To: shrug-l at
Subject: shrug-l: Determining radius of an Arc

Hey Guys,
I need some help. I have a centerline feature class which includes arcs for the curves. They were created using the end-point arc and tangent arc tools. If I wanted to find out what the radius of the arc is, how can I do that. I know how to do this in CAD but have never had to do it in ArcGIS until today. If it is being stored as a true arc in the Geodatabase I would think the radius would be a property.

Tripp Corbin, MCP, CFM, GISP
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