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I would like to be able to create a convex hull in ArcGIS 9.x, but I can't find an appropriate tool. How does one go about creating one? I am interested in answers for all license levels, ArcView, Editor and Info.

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There is a convex hull option in the qgis 1.7.4 geoprocessing tools that appears to do exactly the same thing as the tool in Arcgis 10 with the convex hull and group options –  user7905 May 31 '12 at 14:02
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6 Answers

up vote 5 down vote accepted

I've used Hawth's Tools "Create Minimum Convex Polygons" under the Animal Movements menu. You can use a feature selection within ArcMap.

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Nice. This seems to be the most broadly applicable answer. Here's a link to a description of this tool: spatialecology.com/htools/createmcp.php –  Charles Roper Jul 22 '10 at 19:46
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At version 10, there is now a Convex Hull geoprocessing tool.

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Wow, the new Minimum Bounding Geometry tool looks excellent. Unfortunately, CONVEX_HULL, CIRCLE, and ENVELOPE are only available with an ArcInfo license. More info: help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//… –  Charles Roper Aug 4 '10 at 15:03
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in version 10, see resources.arcgis.com/gallery/file/geoprocessing/… which produces all regardless of license level –  Dan Patterson Jan 24 '11 at 20:06
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There is such a tool.

Open ArcToolbox > Cartography > Masking > Feature Outline Masks

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That's for ArcInfo only. I've updated the question slightly to better help ArcView and ArcEditor users. –  Charles Roper Jul 22 '10 at 19:33
    
That is true. :P –  George Jul 22 '10 at 19:45
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See if this works for you.

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Please include at least the name of the tool so if/when the link changes people have a hope of finding it again. Also a good idea to add a short description. Thanks. –  matt wilkie Oct 14 '10 at 20:53
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This an old arcscript that worked well http://arcscripts.esri.com/details.asp?dbid=12084 (ignore 0k filesize error on arcscripts it is 359kb) creates the convex hull of a set of points or or the convex envelope (minimum bounding box) of a set of points

Note:uses VBA but works in arcview, arceditor arc/info.

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Old question, but since appears quite high when searching for "convex hull arcgis", thought I'd add this reference:

http://www.arcgis.com/home/item.html?id=7ce38f8d64dd44f7873051069e56461f

This uses the geometry convexhull() method (requires 10.1 or above, tested in 10.2). Works fine in ArcGIS basic, the code in the (python) toolbox is also a good reference for using this method elsewhere.

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