Change boundary nature reserve / national park areas

[matthijsmelissen]

This changes the rendering of national parks in the following way:

• Render border with a double uninterrupted line (line marinas).
• Require 100px minimum size for rendering.
• For zoom levels 10-12, drop transparent fill.
• Resolves national_park on top of a road looks like an access restriction #69
• Resolves Nature reserve extents are unclear #563
• Supersedes Change boundary nature reserve / national park areas #1077

Changes with respect to #1077:

• Restore transparent fill for zoomlevels 7-9.
• Make line slightly narrower on zoomlevels 10-12 and wider on zoomlevel 10-13.

[imagico]

Still think an upper limit in terms of way_pixels for the fill would be better. Just for reference - the largest currently mapped nature reserves in terms of web mercator real estate are probably

http://www.openstreetmap.org/way/231394343
http://www.openstreetmap.org/way/257722804
http://www.openstreetmap.org/relation/2098390
http://www.openstreetmap.org/relation/3960826

Currently unmapped but equally too large to be shown with a fill at z=10 are

http://en.wikipedia.org/wiki/Quttinirpaaq_National_Park
http://en.wikipedia.org/wiki/Wrangell%E2%80%93St._Elias_National_Park_and_Preserve
http://en.wikipedia.org/wiki/Gates_of_the_Arctic_National_Park_and_Preserve
http://en.wikipedia.org/wiki/Northeast_Greenland_National_Park

the last is already too large even at z=7 of course.

[matthijsmelissen]

I agree with the problem, but I don't think an upper limit in pixels is a good idea. It would lead to some areas being transparent while others aren't within the same view. I think that would be very confusing. I'd propose to merge this change first, and possible consider a change that goes further than this after it is merged.

[gravitystorm]

Merged. I do think there's room for improvement here, I find the edge of the park boundaries hard to spot when the fill disappears. Perhaps we can have wider boundaries since (unlike marinas and theme parks) they cover much bigger areas, and are more likely to have a complex amount of data underneath.

[matthijsmelissen]

I suppose you're referring to zoom 10-13? Not all nature reserves are big, so I am not sure if a bigger outline will always work. After this is rolled out I will have a new look if it makes sense to widen the outline on these zoom levels.

[daganzdaanda]

Just wanted to thank you for this change, it works well in the areas that I looked at.