topic Re: Convex Hull / Minimum Bounding / Envelope, etc... in ArcGIS JavaScript Maps SDK Questions

Convex Hull / Minimum Bounding / Envelope, etc...

MarkLittell — Sat, 08 Jul 2023 18:36:38 GMT

I read in a JSON with multiple points. I want to create a polygon that contains all the points.

Seems there was a way to do this JS 3.X, https://developers.arcgis.com/javascript/3/sandbox/sandbox.html?sample=util_convexhull

I cannot find out how to do it 4.x

I don't want the map extent; the area is too large.

I've tried to do the extent of a Graphics Layer after adding the points, it defaults to +-180 / +-90.

I was trying to do the geometryService.ConvexHull and could not figure out how to properly insert the point geometries.

Any help is appreciated.

Re: Convex Hull / Minimum Bounding / Envelope, etc...

mleahy_cl — Sun, 09 Jul 2023 15:07:06 GMT

Try creating a single mutipoint geometry from your points, then use the geometryService.ConvexHull method. Maybe that will work.

Re: Convex Hull / Minimum Bounding / Envelope, etc...

UndralBatsukh — Tue, 11 Jul 2023 22:55:23 GMT

Hi there,

You can do it several different ways.

You can do it using geometryService.convexHull as mentioned above but it is requires a trip to a server.

You can use geometryEngineAsync.convexHull() method and the calculation will run on the client-side without having to go back to the server. I created a simple codepen to showcase how to use geometryEngineAsync's convexHull method.

If you are working with ArcGIS Online hosted feature service then you can take advantage of convex-hull-aggregrate statistics with query.