[MapServer-dev] Motion: adopt RFC-142: Geodesic Scalebar Measurement

[Michael Smith]

+1 

Mike

 

From: MapServer-dev <mapserver-dev-bounces at lists.osgeo.org> on behalf of Seth G via MapServer-dev <mapserver-dev at lists.osgeo.org>
Reply-To: Seth G <sethg at geographika.co.uk>
Date: Wednesday, September 16, 2026 at 1:57 AM
To: Tamas Szekeres <szekerest at gmail.com>, MapServer Devs <mapserver-dev at lists.osgeo.org>
Subject: Re: [MapServer-dev] Motion: adopt RFC-142: Geodesic Scalebar Measurement

 

+1 thanks Tamas. 

 

(as an aside, QGIS also seems to default to centre of the map for scale: https://docs.qgis.org/3.44/en/docs/user_manual/introduction/qgis_configuration.html#scale-calculation-method)

 

Seth

 

On Tue, Sep 15, 2026, at 11:15 AM, Tamas Szekeres via MapServer-dev wrote:

Dear PSC,

 

I would like to motion to adopt RFC-142: Geodesic Scalebar Measurement. Based on the discussion of this RFC I've simplified the solution by removing the MEASURE parameter (therefore the RFC has been renamed) and that the result represents horizontal local scale at the map center (not bound to the actual scalebar location). According to Even's suggestion, if the project has a CRS we use the geodesic scale, otherwise fallback to cartesian method.

 

The modified RFC can be found here: https://mapserver.org/development/rfc/ms-rfc-142.html

 

The corresponding PR with the suggested changes: https://github.com/MapServer/MapServer/pull/7507/changes

 

Starting with my +1,

 

Tamas

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