advanced coastline mappaint style

[Klumbumbus]

I was thinking about displaying the sides of a coastline in the mapview because errors in the coastline can cause big rendering issues. (We also have such renderings for cliff, embankment, kerb, retaining_wall.) Possible solutions could be:

• blue right-casing and brown left casing
• image pattern with waves at the right side

However we already have validator warnings for coastlines and I do not know if an advanced paint style would be distracting. Coastlines are also often together with boundaries and landuse borders. Since I do not have experience with coastline mapping, I'm not sure if it would be helpful or painful. Any opinions?

Example:

Code for this:

way[natural=coastline] {
    width: 1;
    color: water#0000ff;
    right-casing-width: 2;
    right-casing-color: water#0000ff;
    right-casing-offset: -1;
    left-casing-width: 2;
    left-casing-color: brown;
    left-casing-offset: -1;
}

[bastiK]

It is a good idea to have a visual cue what direction the coastline should be. I fear with both a brown and a blue line, it looks as if there are 2 ways. Maybe we can imitate the Mapnik style for nature_reserve (e.g. ​here).

way[natural=coastline] {
    width: 2;
    color: water#0000ff;
    right-casing-color: water#0000ff;
    right-casing-width: 5;
    right-casing-opacity: 0.45; 
}

(Not sure if this style is intuitive though.)

[Klumbumbus]

I like your style, but I would make the casing a bit more transparent. The only confusing thing is that such a stlye is usually at the inner side of the border. Here it shows the outer part. But I think since it is blue it is not a big deal. I think we should test this in next milestone.

[Don-vip]

skip milestone 15.06

[Klumbumbus]

In 8504/josm:

fix #11464 - display sea side of coastline by blue casing

[Don-vip]

Milestone renamed