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I need some help finding circle shapefiles (polygons) within a database, something like tanks and silos, but they weren't classified right in OSM so looking for attributes won't help (doh!).

Is there anyway to select circles in ArcGIS or QGIS?

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L.Chant
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    Welcome to GIS SE! As a new user please take the [tour] to learn about our focused Question and Answer format. By asking about both ArcGIS and QGIS this makes the question too broad - please [edit] your question to focus on one GIS software. If you are after answers for both please put the other in a separate question. – Midavalo Feb 08 '17 at 16:28
  • Are you trying to create circle features or differentiate circles from other shapes? – Ryan Feb 08 '17 at 16:31
  • If you are typing to identify circle-shaped geometries, that is a very different task than locating shapefiles in a database (once loaded, the data from a shapefile is no longer a shapefile). This is probably also relevant: http://gis.stackexchange.com/questions/73362/how-to-efficiently-determine-if-a-collection-of-coordinates-polygon-is-an-elli – Vince Feb 09 '17 at 02:17
  • http://gis.stackexchange.com/questions/210467/identify-circle-segments-in-polyline-feature-class/210563#210563 – FelixIP Feb 09 '17 at 03:47
  • Hi Vince and FelixIP. Thanks for your comments. I am trying to differentiate circles from other shapes. Yes, I am trying to identify circle-shaped geometries. I have loaded shape files into arcmap and there are thousands of shapes, squares, but I would like to identify circles so I can attribute them as tanks. – L.Chant Feb 09 '17 at 19:09
  • I read your links Vince and FelixIP and it looks like http://gis.stackexchange.com/a/210512/91202 link maybe had what I was looking for. @GBG has some information on how to find circle polygons but he's using an isoperimetric quotient. I wonder how would that be done? I tried the formula to plug in the calculation field in ArcMap but couldn't find information for it. Maybe you guys can point me in the right direction? Thanks ryan midavalo vince felixIP – L.Chant Feb 09 '17 at 22:03

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