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I have some land registry data and I would like to know if there is a way of selecting all the polygons that contain a right angle.

I'm using (basic license) Arcgis 10.5.1.

Here's and image of part of the data with the an example polygon I would like to capture

Here's and image of part of the data with the an example polygon I would like to capture

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  • If you need the same question answered for QGIS then please ask it as a separate question.
    – PolyGeo ♦
    Commented Mar 28, 2018 at 20:06

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You can use (Calculate Polygon Main Angle)

First you need to add numerical field to your shapefile (call it e.g angle)

Then open the (Calculate Polygon Main Angle) and define you dataset, and the angle field.

enter image description here

Then, select by attribute, select when Angle = 0,90,-90

"Angle" = 0 OR "Angle" = 90 OR "Angle" =-90

enter image description here

And the result:

enter image description here

PS: this method in not totally accurate because the computed angle (The dominant angle of a polygon is the angle of longest collection of segments that have similar orientation. This angle will be stored in the specified field in decimal degrees from true north)[ARCGIS].

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