Distinguish overlapping protected areas about openstreetmap-americana

[1ec5]

One solution used by other map styles is to make protected area styling additive, such as an opacity value that can build up given multiple overlapping features. Perhaps a better solutions would be to distinguish common types of protected areas, to have somewhat different styling for conservation districts, nature reserves, parks, wilderness areas, etc.

We’d need to make sure this jives with other things that are already translucent, such as buildings, intermittent waterbodies, and tunnels, not to mention label halos. #610 achieved a delicate workaround to get coastlines that don’t tear at tile boundaries or mouths of rivers; this depended on adequate contrast between the water fill and maritime park boundaries.

[1ec5]

#994 suggests a darker park fill, which might complicate this task a bit.

[quincylvania]

@1ec5 I think there is room to make protected areas a bit darker and perhaps make wilderness areas a tad darker than that? Or have some sort of darker green patterned overlay?

[1ec5]

Do the tiles make a distinction between parks and wilderness areas that we can reliably key off of?

[ZeLonewolf]

The park layer in OpenMapTiles is somewhat of a mess, I made a start in openmaptiles/openmaptiles#1491 but never brought it to conclusion.

[quincylvania]

The Oregon state highway map renders wilderness areas as darker green than national forests. It renders national parks as pink, which we may not want, but we probably do want national parks to be distinctive compared to national forests/BLM/etc.