[MapServer-users] circle with same real world size (sizeunits meters) for all zoom levels

[Lars Schylberg]

Hi Sarah,

I have had problems with circle symbols with sizeunit meters in the 
past.  So I presented some of my alternative solutions i a talk at 
FOSS4G last year.  Here is a link to the presentation: 
https://github.com/LarsSchy/Mapserver-Circles/blob/main/MapServer-Circles.pdf

The video is here: https://www.youtube.com/watch?v=vlagaZLxekg

Some example code can be found at: 
https://github.com/LarsSchy/Mapserver-Circles.

I do agree that there exists some problem with circle symbols with size 
unit meters, that I really can't explain

Have fun!

/Lars Schylberg

Den 2022-09-05 kl. 13:44, skrev Sarah Huber:
>
> Hallo,
>
> I configured a point layer with "circle" symbol and sizeunits meters. 
> The circles should have the same size in real world units (meter) for 
> all zoom levels, for example 100 m.
>
> This works for most zoom levels, but when I zoom in closely the 
> circles get smaller (< 100 m).
>
> I don't have configured any maxsize or minsize for the layer.
>
> How can I configure the layer to have the same size in meters for all 
> zoom levels? Like it behaves with polygons?
>
> My layer definition in the mapfile: https://pastebin.com/JVWBvScP 
> <https://pastebin.com/JVWBvScP>
>
> Example screenshots of the layer (as WMS in QGIS):
>
> Circle with correct size (100 m), same as square: 
> https://pasteboard.co/VWmur23PHiir.jpg 
> <https://pasteboard.co/VWmur23PHiir.jpg>
>
> Circle smaller than 100 m (and smaller than square): 
> https://pasteboard.co/SFJZMJgp4j8k.jpg 
> <https://pasteboard.co/SFJZMJgp4j8k.jpg>
>
> Thanks
>
> Sarah
>
>
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