How to create a polygon file based on a point grid file

06-14-2016 03:40 PM
Occasional Contributor III


I know this is going to be classified as GIS101, but I cannot for the life of me find a tool that will do what I require.

I have a point feature class, it has about 1 million points, it represents a flood area, and what I need to create is a polygon which represents the extent of the area affected by this flood. So basically I need it to 'shrink wrap' my points. See below my technical sample drawing, I am trying to create the extent (red) polygon, around the existing points (black dots).

What tool do I need???


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3 Replies
MVP Legendary Contributor

You want a concave hull, there used to be several, but Richard Fairhurst​ 's toolset might just do the work for you

Bruce Harold's Concave Hull Estimator Tool Enhanced

Occasional Contributor III

Thanks Dan, I am running the tool now to see if it does what I am looking for!


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MVP Esteemed Contributor

You could try Aggregate Points—Help | ArcGIS for Desktop

Define a higher value for the aggregation distance, so that it forms a single polygon.

Think Location