topic Re: Wrong minimum bounding circle in UTM in Geoprocessing Questions

Wrong minimum bounding circle in UTM

Durga_PrasadD — Wed, 05 Dec 2012 08:35:16 GMT

I have found Minimum bounding circles for some polygon features.Most often I find that some features lying outside the resulting circle.
Is this a bug in ESRI ArcGIS?

I used an alternative method of finding bounding circle...Find the envelope>Get the centroid>Get the farthest vertex from centroid and use ICircularArc interface to draw circle.This seems to provide correct result.

Any suggestions?

Re: Wrong minimum bounding circle in UTM

JakeSkinner — Wed, 05 Dec 2012 11:04:31 GMT

Hi Durga,

What version of ArcGIS Desktop are you running (including service packs)? Do you have a sample dataset you could upload that exhibits this behavior?

Re: Wrong minimum bounding circle in UTM

DanPatterson_Retired — Wed, 05 Dec 2012 11:16:44 GMT

try http://resources.arcgis.com/gallery/file/geoprocessing/details?entryID=3D230972-1422-2418-34A5-2F3FFF97C238 and compare results

Re: Wrong minimum bounding circle in UTM

Durga_PrasadD — Thu, 06 Dec 2012 03:31:26 GMT

I am using 9.3.1. Attaching the shape files that I used in UTM projection

1)Points.shp---My features of interest
2)BoundingBox.shp----Envelope for above points
3)BoundingBox_Centroid.shp---Centroiod of this envelope
4)BoundingBox_Centroid_Generat.dbf---Near table created by Proximity Analysis tool
5)BoundingCircle.shp---Buffer created using largest distance(3582.146565 meters in this case)

FID 1275 is the farthest vertex in Points.shp from centroid ..this seems to lie oust side the BoundingCircle

I noticed an interesting thing...I have used 'Smooth' tool from Advanced Editing feature,with a threshold of 0.09(which is the measured deviation from circle boundary to the outlier point).This is resulting in a circle that passes through the outlier point just as I need.
Unfortunately,this is true only during editing session.The changes get lost when I save the changes brought in by 'smooth' .