[openstreetmap/openstreetmap-website] Information on Map Layers - consistency and usefulness (#3311)

[Christoph Hormann]

I think there is significant room for improvement of the information on the meanwhile six map layers available on the website provided to the user.  Right now in the layer selector we only have the title (which is not really that descriptive in many cases) and what is on the bottom right on the map.  That consists of OSM attribution and *Website and API terms* plus a middle part which depends on the layer chosen, currently:

* *Standard*: Make a Donation
* *CyclOSM*: Tiles style by CyclOSM hosted by OpenStreetMap France
* *Cycle Map*: Tiles courtesy of Andy Allan
* *Transport Map*: Tiles courtesy of Andy Allan
* *ÖPNVKarte*: Tiles courtesy of MeMoMaps
* *Humanitarian*: Tiles style by Humanitarian OpenStreetMap Team hosted by OpenStreetMap France

This seams to be very non-uniform and purely based on the interests of the technical tile providers and fairly non-ideal for the user experience and for supporting the reasons why we have these different map layers on the site (as reflected in the [Guidelines for new tile layers](https://wiki.openstreetmap.org/wiki/Featured_tile_layers/Guidelines_for_new_tile_layers)).

Specific suggestions on how this could be improved:

* For the three layers which are based on open map styles (see [here](https://wiki.openstreetmap.org/wiki/Featured_tile_layers)) link to the map style projects, this helps giving these projects publicity and this way support in their work:
  * [OSM-Carto](https://github.com/gravitystorm/openstreetmap-carto)
  * [CyclOSM](https://github.com/cyclosm/cyclosm-cartocss-style/)
  * [Humanitarian](https://github.com/hotosm/HDM-CartoCSS/)
* Each map layer has a page on the OSM wiki - linking to that would be helpful as well:
  * https://wiki.openstreetmap.org/wiki/Standard_tile_layer
  * https://wiki.openstreetmap.org/wiki/CyclOSM
  * https://wiki.openstreetmap.org/wiki/OpenCycleMap
  * https://wiki.openstreetmap.org/wiki/Transport_Map
  * https://wiki.openstreetmap.org/wiki/%C3%96PNVKarte
  * https://wiki.openstreetmap.org/wiki/Humanitarian_map_style
* For at least three of the layers there exists a hand curated map key that would be useful as well to link - useful map keys are a frequent request by website users, see also #982, #1307:
  * https://wiki.openstreetmap.org/wiki/Standard_tile_layer/Key
  * https://www.cyclosm.org/legend.html
  * https://www.opencyclemap.org/docs/
* A short descriptive text for each layer (to be shown as tooltip or in the layer selector for the active layer if there is enough space on screen) would be very good as well.  Of course i realize that this would be work to create and maintain.  Important information (all part of the [Guidelines for new tile layers](https://wiki.openstreetmap.org/wiki/Featured_tile_layers/Guidelines_for_new_tile_layers)) would be in particular:
  * Thematic significance of the layer and usefulness for the visitor
  * Update interval of the data
  * Any use of non-OSM data




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