[mapserver-users] street round intersection, crossroads

[Stephen Woodbridge]

There is not trick to this, I have plenty of maps with roundabouts in 
them. You just have to digitize the the roundabout as segments. 
Mapserver just draws points, lines and polygons, what you are 
visualizing as a nice smooth circle is nothing more then a line with 
multiple vertices, a LINESTRING.

-Steve W

On 2/3/2012 8:51 AM, gabriel munteanu wrote:
> Hi,
>
> I would like to achieve in mapserver something like this google map:
> http://maps.google.com/maps?q=Paris,+France&hl=en&ie=UTF8&ll=47.174895,-1.624206&spn=0.005594,0.012167&sll=44.437711,26.097367&sspn=0.376038,0.778656&t=m&z=17
> Please notice the round crossroads.
> Before I place my question, here is my setup.
> the map editor: a custom openlayers tool.
> It saves labels, lines, polygons through WFS-T with tinyows into a
> postgres+postgis db.
> a mapserver to render these vector features.
> There are 2 questions:
> 1. As my starting point is raw satellite images, what would be the
> best approach for the editor? Should I let him make only the lines for
> the street and then I compute the intersections in the sql query in
> the layer section of the mapserver? should i give him the possibility
> to make a point at the intersection of the 2 lines on a different
> layer? or maybe a regular polygon with many sides ?
> 2. Once I have the lines on the street layer and optional
> point/regular polygon on the crossroads layer, how do I go about and
> make it look like the google map shown at the link above ?
> I will take as example the crossroads at Rue Eugene Pottier and Route
> de Paimboeuf. Coming from North-East the thin red line acting as
> border goes around in a nice curve and goes north to  Rue Eugene
> Pottier [the border below goes south the same nice way]. and in the
> middle there is a circle showing underneath layers with the same color
> - thin red.
>
> I didn't find any examples, or any mapserver map that can do this? Is
> it even possible? Or is there a trick in STYLE section that can
> achieve this result?
>
> Thank you in advance,
> Gabi
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