Draw a polygon automatically around points,

[MajdoleenO_A__Awadallah]

Draw a polygon automatically around points,

I am looking for a way to draw a polygon automatically around points that have similar value in one field of the attribute table.

For example, in the screenshot below, I wanted to draw a polygon around the points that have class B, and to have the points inside the curved polygon but not as if they are at the boundaries (not like minimum boundary geometry tool).

Thank you in advance,

Best,

Majdoleen

[XanderBakker]

You should probably use Thiessen polygons to get a simular result. See Create Thiessen Polygons—Help | ArcGIS for Desktop followed by dissolving on the attribute. Create Thiessen Polygons requires an advanced license, but Dan Patterson​ has created a tool for Basic license that creates them too.

Dan Patterson​, can you add the link to that tool? Thanks!

[MajdoleenO_A__Awadallah]

Thank you Xander, but my point here that I want to produce smooth curved polygons around the points that have similar value as shown in the screenshot.

Best,

Majdoleen

[XanderBakker]

You can apply a negative buffer after the dissolve step.

[XanderBakker]

Or better yet, use the Smooth Polygon—Help | ArcGIS for Desktop tool (Advanced license required)

[DanPatterson_Retired]

Xander...

Called... Triangulation Tools ...since it does both Delaunay and Voronoi

[XanderBakker]

Thanks Dan, I will bookmark it (include it in my local Wiki)

[smevans88]

Thanks Xander,

I ran into a similar issue. I was trying to go from points to line, using a specific attribute of the points layer

I have foot by foot points along a line. I have sectioned out the points by an specific attribute, using the thiessen polygons. Then the dissolve tool helped to lump the similar polygons together.

Now, I can clip a base mainline (for railroad) polyline layer by the polygons. Perfect solution.

Thanks!

Scott

[XanderBakker]

I do wonder how you are going to manage the points identified with the letter "A". If I create Thiessen polygons the "C" polygon does not connect since the A points are nearer:

as you can see here (after dissolving):

Applying a negative buffer and Smooth polygon with the PEAK setting doesn't really get us there:

The BEZIER setting gets a little closer, although it still isn't the result you sketched.

[MajdoleenO_A__Awadallah]

Thank You, It is very helpful, but the only thing that missing here is: I want all the A's in one single polygon!!