draw filled polygons for airport areas

[almccon]

Where available from OSM. Will cover over landcover issues in airports:

[clhenrick]

@almccon do you happen to know which tag OSM uses for airport fills?

[almccon]

Try aeroway=aerodrome, I think. http://www.openstreetmap.org/way/131190417

[clhenrick]

@almccon it looks like airport fills are linestring geometries so we can't apply a polygon-fill with CartoCSS (or is there a hack where we can?)

I suppose an alternative would be to create a separate table that converts these features to polygon geometries so we can render the fills?

terrain_seattle=# select distinct st_geometrytype(geometry) from osm_aeroways where type = 'aerodrome';
 st_geometrytype 
-----------------
 ST_LineString
(1 row)

[clhenrick]

referenced the wrong issue for this commit e13c8d9 but I added temporary cartoCSS to style the airport fills.

[clhenrick]

Actually I'm wrong, the fill is working for airport areas / aerodromes.

[clhenrick]

@almccon in looking into this I noticed:

• that airport runways were covering up some minor roads, rail, and tunnels at higher zooms so I moved the runway layer below the roads layer in the respective .yml files.
• the layer containing runways was applying default line styles to the area boundaries which I removed.
• I added a second layer and polygon style for the airport areas (the runway color lightened by 10%) with no line style.

Example: