lake center lines

[cldellow]

I don't currently label lakes. We could label them as point features, or as center lines.

Center lines are visually appealing, and IMO, reduce clutter by using space that is guaranteed not to conflict with other labels.

Sources of center lines:

• Daylight Maps's 1,905 lines: https://daylightmap.org/2023/03/20/water-labels.html

  • I experimented with these. They're quite nice, but the coverage is very limited. I think their goal was more "have beautiful labels at low zooms", and mine is "have beautiful labels at z12"

• https://github.com/openmaptiles/osm-lakelines

  • Needs postgis? :(
  • They have a released .geojson file, it's 11 MB and has 14K features. The features don't have names, and the OSM IDs are a bit weird, eg: some are negative (encoding ways vs relations maybe?), some are fractional
  • newer fork here: https://github.com/acalcutt/osm-lakelines, its geojson file is 344MB, 59K features, I see Maligne Lake -- this might be good enough!
  • I think we'll need to process the geojson file to add lake names, or build an sqlite file lake names that we can query dynamically

• https://github.com/ungarj/label_centerlines

  • a Python script, it does the heavy lifting in osm-lakelines -- we could have Tilemaker do an export, then use this and import the resulting thing as a geojson file