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[Geojson] Question regarding RFC 7946: Interior and Exterior Linear Rings

Chris Goodman <Chris.Goodman@objectconsulting.com.au> Tue, 23 May 2017 07:19 UTC

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From: Chris Goodman <Chris.Goodman@objectconsulting.com.au>
To: "geojson@ietf.org" <geojson@ietf.org>
Thread-Topic: Question regarding RFC 7946: Interior and Exterior Linear Rings
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Date: Tue, 23 May 2017 07:19:06 +0000
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Subject: [Geojson] Question regarding RFC 7946: Interior and Exterior Linear Rings
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Polygons with more than one of these rings, the first MUST be
      the exterior ring, and any others MUST be interior rings.  The
      exterior ring bounds the surface, and the interior rings (if
      present) bound holes within the surface.


Q1. If an interior linear ring (hole) is not completely inside the exterior ring (border) of a polygon, is it an illegal polygon?

GeoJson.io allows such an interior ring to be imported. Perhaps it is a bug.

Q2. If the interior ring is not clockwise, then what is the expected behaviour of the polygon?

Q3. Should 'interior linear ring' and 'exterior linear ring' be formally defined in the RFC?

Q4. If two interior linear rings overlap, then is the result the union of the two holes?


Regards, Chris
Chris Goodman
Supervising Consultant
M:  +61 419 482 620
Office:  +61 3 8615 4500
Web: www.objectconsulting.com.au
Email: chris.goodman@objectconsulting.com.au<mailto:chris.goodman@objectconsulting.com.au>

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