[mapserver-users] Re: polygon border artifacts

[Lime, Steve D (DNR)]

When I think of why outlines don't make sense in this case it's because they further alter
the coastline- that's all. We do all sorts of weird configuration to create certain visual
effects. Drawing oceans to highlight land is an example in its own right. ;-)

Do outlines fix things at all zoom levels? What about the possibility of fixing the data?
I mean, unioning the ocean polys into one, or better yet deriving land polygons from 
that data.

Steve

________________________________________
From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] on behalf of Sven Geggus [lists at fuchsschwanzdomain.de]
Sent: Monday, May 07, 2012 1:47 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] Re: polygon border artifacts

"Lime, Steve D (DNR)" <Steve.Lime at state.mn.us> wrote:

> I tried locally and it's definitely a rendering artifact related to anti-aliasing.

The artifact is getting worse in lower zoom levels (smaller islands).

I just tried a huge overlap of the polygons which made it better but
did not make it disapear also. So the workaround could be to find the
perfect combination of outlinewidth (as small as possible) and
overlap factor (also as small as possible).

> Should an outline always be drawn?

Tiled ocean polygons like I have them should be the perfect example
where an outline just does not make sense.

One would probably want to have an outline on the coastline but not
on polygon borders. Something one would need to render from a separate
linestring layer anyway.

Regards

Sven


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"If you don't make lower-resolution mapping data publicly
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