You need to use “org.locationtech.jts.hull.ConcaveHull”
This is not in the core code, but can be found
https://github.com/locationtech/jts/blob/master/modules/lab/src/main/java/org/locationtech/jts/hull/ConcaveHull.java
Jim
From: jts-dev-bounces@xxxxxxxxxxx <jts-dev-bounces@xxxxxxxxxxx>
On Behalf Of Afonso Henrique Sampaio
Sent: 23 November 2020 20:42
To: JTS project developer mailing list <jts-dev@xxxxxxxxxxx>
Subject: Re: [jts-dev] Dimension of a MultiPoint
Unlike the convex hull, the boundary can shrink towards the interior of the hull to envelop the points. So
Boundary: ConvexHull:
p1 ---------p5 p1------------p5
p3 ---------p5 p3------------p4
In the application we are developing, the edges (p1,p2) and (p2,p3) are also of interest...
Many thanks for the prompt response!
Afonso.
On Mon, Nov 23, 2020 at 9:28 PM Sandro Santilli <strk@xxxxxx> wrote:
On Mon, Nov 23, 2020 at 09:17:56PM +0100, Afonso Henrique Sampaio wrote:
> Dear,
> perhaps a silly question, but I'm new using JTS. I have a set of
> coordinates (x,y), and create a MultiPoint from a
> corresponding CoordinateSequence. Now, the dimension of this geometry I get
> by getDimension() is 0, and thus getBoundary() returns an empty Geometry.
> How then can I obtain the boundary of a set of points?
You're probably looking for Envelope, or ConvexHull
--strk;
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