Render parking at z14 and greater

[jeisenbe]

Changes proposed in this pull request:

• Render parking at z14 and above only
  (No longer render parking lots at z10 to z13)

Explanation:

• Parking lots currently render as soon as z10, and the icon is rendered as soon as the way_pixels (height x width) is greater than 900 (eg 30 pixels wind and high), without consideration of zoom level
• However, very few parking lots are large enough to have an icon at z13 (I have yet to find one), and generally only the fill color is visible
• The fill color for parking is nearly the same as the background land-color, or the color of untagged land, so parking lots are only visible at z13 and lower when they are surrounded by other land uses or natural areas, and they then appear as a "hole" in the landuse or other area.
• This is a particular problem in the USA, where many town centers have more than 50% of the land covered in parking lots, thus obscuring most of the retail or commercial area.
• By stopping rendering parking lots at z10 to z13, it will be easier to see the correct outline of retail, commercial and industrial areas at z13, and developed land in general at z12 and below.

Test renderings with links to the example places:

Kahului, Hawaii
https://www.openstreetmap.org/#map=13/20.9042/-156.4423
z12 Before

After

z13 Before

After

Double Resolution to show details:
Before z12 - double

After - double

Before z13 - double

After - double

Washington, DC
z12 Before

z12 After

z13 Before

z13 After

Newcastle and Newark, Delaware
z12 Before

After

z13 Before

After

z12 - double resolution
Before

After

z13 - 4x resolution
Before

After

Derry, N. Ireland:
https://www.openstreetmap.org/#map=13/54.9936/-7.3074
z12 before

z12 after

z13 before

z13 after

z12 double resolution - before

after

Belfast, N. Ireland:
https://www.openstreetmap.org/#map=13/54.5975/-5.9104
z12 Before

z12 After

z13 Before

z13 After

z12 - at double resolution

After

[matthijsmelissen]

Thanks!

[kocio-pl]

Thanks, that's small but good improvement.

[goldfndr]

I might be way off here, but does this mean they (parking types) can be removed from landcover/features and amenity_points_poly and only checked in amenity_low_priority and amenity_low_priority_poly?

[jeisenbe]

Parking is in both the regular .points layer (for polygons larger than 900 way_pixels) and in the amenity_low_priority layer (for smaller areas and nodes, but only at z17 or z18 and up). These are both for the icons. The landcover layer is used for the background fill color, which is still rendered at z14 and higher. It’s a little confusing.

…

On Mon, Dec 31, 2018 at 11:38 AM Richard Finegold ***@***.***> wrote: I might be way off here, but does this mean they (parking types) can be removed from landcover/features <https://github.com/gravitystorm/openstreetmap-carto/blob/master/project.mml#L148> and amenity_points_poly <https://github.com/gravitystorm/openstreetmap-carto/blob/master/project.mml#L148> and only checked in amenity_low_priority and amenity_low_priority_poly? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#3612 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AoxshBcJ9OgomwuaaDi-9nO7m5_qmoA_ks5u-XiqgaJpZM4Zk9qt> .

[kocio-pl]

Related to #2896.