Add rendering for water=pond nodes

[sylvain-m]

Small ponds [1] water=pond are very interesting for biodiversity and are also important landmarks, for example in forest environments, where ponds cannot be mapped on a surface level because they are not visible under the canopy.

There are already 3100 ponds mapped as nodes.

It would be interesting to add them to the rendering, as a very simple blue dot, visible from zoom 16 or 17.
It could be the same icon than natural=spring :

Here is an example of a node pond named, next to another mapped as an area :
https://www.openstreetmap.org/node/3078353533

[1] Called "mares" in French. I don't know the english word (perhaps "waterhole" ?)

[sylvain-m]

I found wikidata element :
https://www.wikidata.org/wiki/Q3177968
With French Wikipedia description : https://fr.wikipedia.org/wiki/Mare (no english version !?)

[matkoniecz]

where ponds cannot be mapped on a surface level because they are not visible under the canopy.

where ponds cannot be mapped without survey on the ground

[imagico]

Thanks for the suggestion.

We generally support mapping features which are widely mapped with polygons to be mapped with nodes by rendering a point label at the higher zoom levels for those. But because this is in most cases a not very widespread mapping practice we do not go beyond that.

For water=pond more than half of the nodes currently in the database are from imports:

https://taginfo.openstreetmap.org/tags/water=pond?filter=nodes#combinations
https://taginfo.openstreetmap.org/tags/water=pond?filter=nodes#chronology

Hence i don't think there is a very strong basis for adding a point symbol rendering for nodes with water=pond - especially since we have a long laundry list of things to work on w.r.t. water related point features, see #1224, #3461, #4073.