Points to Polygon?

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12-09-2015 08:33 AM
MorganCunningham
New Contributor II

Hi, I'm very new to GIS. Could anyone tell me how I convert these points into a polygon? I am trying to display these ship coordinates as a zone/area, rather than points. I am using ArcMap 10.1 Thank you!

PolygonQuestion.png

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11 Replies
KyleBalke__GISP
Occasional Contributor III

How about the Minimum Bounding Geometry geoprocessing tool...works with all licensing levels.

ArcGIS Help 10.1

ChadKopplin
Occasional Contributor III

I like this option as well, I was trying to find it in the toolbox, and could not remember what name was.

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ChadKopplin
Occasional Contributor III

Morgan you could go into ArcToolbox>Analysis Tools>Proximity>Create Thiessen Polygons.  Once you create the Thiessen Polygon shapefile, go into an edit session, select all of your polygons, then go into the Editor menu on the editor toolbar and choose to dissolve, then you will be left with a polygon representing the outer boundary of all of your points. 

KyleBalke__GISP
Occasional Contributor III

I agree that this would work but does require an Advanced desktop license (not sure what Morgan has access to).

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nicogis
MVP Frequent Contributor

if you are a developer and you have arcview license you can use my code in ao https://github.com/nicogis/Voronoi

If you need create voronoi diagram on web I have made a PoC with js 4.0 beta1: http://sit5.sistemigis.it/demo/js/3d/voronoi/ (click on map  and generate polygons from points clicked). You can edit js and upload your points and see your polygons.

If you have license 3d Analyst and arcview license you can create a tin (z=0) and from ao you can use method GetVoronoiRegion in ITinNode interface http://resources.arcgis.com/EN/HELP/ARCOBJECTS-NET/COMPONENTHELP/index.html#//002500000933000000 (If you need I send you a PoC).

You can use Dan tool python and arcview license http://www.arcgis.com/home/item.html?id=6e9bc6cbf93d4939b2eb04ff8519be47

TiffanySelvidge1
Occasional Contributor III

If each zone is the same size and you just want a general idea of the area then you could buffer the points and create polygon circles. The resulting layer would be a polygon with the buffer areas.

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VinceAngelo
Esri Esteemed Contributor

You could also use Kernel Density (requires Spatial Analyst) to make a heatmap, then Reclassify (also SA) and convert Raster to Polygon​.  This would give you a series of concentric rings indicating frequency of observations.  It takes a bit to fiddle with the parameters, but this is a very powerful visualization tool.

- V

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DarrenWiens2
MVP Honored Contributor

Do you want a convex minimum polygons or concave hull (or neither), and what license level do you have?

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DanPatterson_Retired
MVP Emeritus

If you want to go the triangulation route http://www.arcgis.com/home/item.html?id=6e9bc6cbf93d4939b2eb04ff8519be47 doesn't require an advanced license level and you can produce a Delaunay triangulation and produce a concave hull if your remove the exterior triangles from the triangulation then dissolve union the interior polygons if needed.

For other containers including convex hull and extent or oriented rectangles you can use http://www.arcgis.com/home/item.html?id=564e2949763943e3b9fb4240bab0ca2f

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