Convex Hull is not always the "closest polygon". It is more like a rubber band around the points.
Alpha Shapes can be used to create a polygon "close" to the points.
Nyall Dawson created a MapBasic tool for creating these Alpha Shapes a decade ago.
The source code can be found on GitHub.
I took his source code and modified it slightly to make it work in MapInfo Pro 64-bit.
I have attached a copy of the compiled file.
Load it into MapInfo Pro, and you will find a new button on the Spatial tab in the Create group.
Select the points you want to use, specify where to save the result and it will process the data.
It will then show you a dialog like the one above.
You can modify the Alpha Value. Larger values will use fewer "outside" points and smaller values will use more "outside" points.
Click the Preview to see the change when modifying the Alpha Value. When you are happy with the result, use the OK to save the final polygon.
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Peter Horsbøll Møller
Principal Presales Consultant | Distinguished Engineer
Precisely | Trust in Data
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Original Message:
Sent: 04-18-2023 13:00
From: Rex Edwards
Subject: Region of Points
Thanks - that may work. Below is the set of red dots I would like to draw around to create a "closest" polygon.
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Rex Edwards
CAMPBELL AVIATION GROUP
Tysons Corner VA
Original Message:
Sent: 04-18-2023 01:59
From: Uffe Kousgaard
Subject: Region of Points
Hi,
Look at Spatial tab > Buffer > Convex hull.
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Uffe Kousgaard
ROUTEWARE
Roskilde
Original Message:
Sent: 04-17-2023 14:03
From: Rex Edwards
Subject: Region of Points
I have a collection of points (not shapes) that I would like to encompass in a region - is there any way to do this? Thanks
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Rex Edwards
CAMPBELL AVIATION GROUP
Tysons Corner VA
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