Currently, river areas (`natural=water` + `water=river`) are rendered in the tiles as `class=river`. However, canal, stream, ditch, and drain water areas are rendered as `class=lake`. Since these types of objects are all flowing water, they should be grouped together into `class=river`, which allows for styles that render flowing water differently to do so on a consistent basis.
This PR proposes to add a new class, "pond" to the water layer, which allows for a style to de-emphasize minor bodies of water (tagged `water=pond,basin,wastewater`) when compared to more significant objects tagged reservoir/lake. This PR retains the default behavior of classifying a water body as a "lake" if more specific tagging is not added.
Add salt pond as water.
Most of salt pond are already tagged with natural=water even if it's not required. So the load added by this tag is very light.
Seems like etl and mapping diagrams have been neglected
for a long time. Now it regenerates the files and places
them in the source dir.
This PR also fixes two broken files:
* layers/aerodrome_label/mapping_diagram.png
* layers/housenumber/mapping_diagram.png
They were generated using the newest tools version with the fix
https://github.com/openmaptiles/openmaptiles-tools/pull/65
Brian Sperlongano
