Polygon Width

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Polygon Width	Timothy Maguire	Jun 14, 2007
Re: Polygon Width	Flavio Mendikovic	Jun 18, 2007
Re: Polygon Width	David Lamb	Jun 18, 2007
Re: Polygon Width	Timothy Maguire	Jul 02, 2007
Re: Polygon Width	David Lamb	Jul 02, 2007
Re: Polygon Width	Timothy Maguire	Jul 02, 2007
Re: Polygon Width	David Lamb	Jul 02, 2007
Re: Polygon Width	Timothy Maguire	Jul 02, 2007
Re: Polygon Width	William Huber	Jul 03, 2007

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Subject	Polygon Width
Author	Timothy Maguire
Date	Jun 14, 2007
Message	Hello Users, I was wondering if any knows of a way to derive the maximum width of a polygon. I would like to use width as a way to identify possible habitat for an endangered species. Thanks Tim

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Subject	Re: Polygon Width
Author	Flavio Mendikovic
Date	Jun 18, 2007
Message	I think it's 100. When you enter a number bigger than 100 you get a message: Please enter number between 0 and 100.

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Subject	Re: Polygon Width
Author	David Lamb
Date	Jun 18, 2007
Message	Do you mean the outline width of the polygon or the actual dimensions of the polygon? Programatically you could get the polygon's IEnvelope, which would give you the width. The envelope is just a rectangle that the polygon fits within. David
	David Lamb

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Subject	Re: Polygon Width
Author	Timothy Maguire
Date	Jul 02, 2007
Message	David, Thanks for the reply. I need to find out the actual width of the polygon, not its outline width. I do not know what IEnvelope is, can you explain further. Thanks again. Tim

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Subject	Re: Polygon Width
Author	David Lamb
Date	Jul 02, 2007
Message	Each feature has a bounding envelope around it (except for points), which is essentially a rectangle that is around it. IEnvelope is an interface that allows a program to access the properties of a feature's envelope. What I did was create a new field of type double. Then used field calculator, checked advanced and used the code below to obtain a width value from the envelope. Put Output in the bottom textbox. http://edndoc.esri.com/arcobjects/9.2/ComponentHelp/esriGeometry/IEnvelope.htm You can obtain all the properties of the envelope by using the .Width syntax. So pEnve.XMax would return the largest x coordinate for the envelope. David
	Dim Output As Double Dim pPoly as IPolygon Set pPoly = [Shape] Dim pEnve as IEnvelope Set pEnve = pPoly.Envelope Output = pEnve.Width
	David Lamb

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Subject	Re: Polygon Width
Author	Timothy Maguire
Date	Jul 02, 2007
Message	David, Thanks for the help. That worked great except for long narrow polygons that are at an angle. When I measure the thickest section of the polygon it may be 100 meters, but the Ienvelope output says that it is over 800 meters wide. Any thoughts? For small rectangular polygons it works great. Tim

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Subject	Re: Polygon Width
Author	David Lamb
Date	Jul 02, 2007
Message	Unfortunately the code just returns the "width" of the dashed line in the attached image, and not the thickest part of the actual polygon. I'm not entirely sure how this would be done. David
	David Lamb
	rectangle example.jpg (opens in new window)

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Subject	Re: Polygon Width
Author	Timothy Maguire
Date	Jul 02, 2007
Message	David, Thanks again for your help. you got me part way to what I need to do. I may have to do it manually. Thanks again. Tim

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Subject	Re: Polygon Width
Author	William Huber
Date	Jul 03, 2007
Message	David, You could adapt the solution posted on the AV 3.x forums at http://forums.esri.com/Thread.asp?c=3&f=39&t=185037&mc=5#msgid546550 .
	--Bill Huber Quantitative Decisions (http://www.quantdec.com ) More GIS Q&A at http://gis.stackexchange.com/q/3083/664