landuse=basin with basin=detention

[merkato]

As in http://wiki.openstreetmap.org/wiki/Tag:landuse%3Dbasin landuse=basin + basin=detention should be used for tagging of dry basins for stormwater.

Proposal for rendering:

[matkoniecz]

basin key is currently not in the dabase (see https://github.com/gravitystorm/openstreetmap-carto/blob/master/openstreetmap-carto.style ), so it is unlikely to be done in near future.

[matthijsmelissen]

See also https://trac.openstreetmap.org/ticket/1997.

[pnorman]

Looking at a couple semi randomly selected landuse=basin areas, I wonder if we should be using a similar rendering for all basins.

[claysmalley]

Under landuse=basin:

• basin=retention should be filled with blue, like a lake or a reservoir
• basin=detention and basin=infiltration should be displayed like a wetland, with little blue markings peppered all over but not covering what's underneath

As it is right now, all basin=* is rendered the former way, and we'd just have to be more specific about what types of basins render which way. This looks like a pretty easy fix.

[matthijsmelissen]

This looks like a pretty easy fix.

So feel free to propose a pull request :)

Sorry for the delay, but we have hundreds of things that are all "easy fixes"...

[claysmalley]

Thanks for the reply!

I've actually been working on that since last night. The code seems straightforward enough but I'm having a hell of a time following the vague, prior-knowledge-required installation instructions. It'd be really nice if someone could help me get this thing up and running so I can test what I'm doing.

[pnorman]

http://switch2osm.org/loading-osm-data/ for loading the data. For tilemill, https://hackpad.com/TileMill-I6rxRVszKMv is as far as I got

[matkoniecz]

@claysmalley See also #657 (comment)

[matkoniecz]

@claysmalley Note also that basin key is currently not in the dabase (see https://github.com/gravitystorm/openstreetmap-carto/blob/master/openstreetmap-carto.style ), so merging implementation for this requires reloading entire database.

[matkoniecz]

If that is still something that should be fixed - is anybody aware about OSM elements that would be a good examples of situation?

[jragusa]

According to the wiki definition and since #3104, we can render the subtag basin as intermittent water body as figured in the first post.

[matkoniecz]

@jragusa Can you provide any example of OSM element (way/relation)?

[jragusa]

Initially, I thought it was only related to storm events and hence to some countries (U.S.) but actually we also find this feature in Europe. They are built to store water during important rainfall and hence prevent large river flooding. They are also frequently found along major highways.

An example here near Annecy (https://www.openstreetmap.org/#map=18/45.92946/6.12063) where you can find 2 basins with the correct tags (https://www.openstreetmap.org/way/529090226 and https://www.openstreetmap.org/way/529090223).

Look at the aerial photograph to compare: https://www.geoportail.gouv.fr/carte?c=6.121392731642797,45.929393524870136&z=18&l0=ORTHOIMAGERY.ORTHOPHOTOS::GEOPORTAIL:OGC:WMTS(1)&l1=GEOGRAPHICALGRIDSYSTEMS.MAPS::GEOPORTAIL:OGC:WMTS(0)&permalink=yes

The upper one contains some water while the lower one is empty

[jragusa]

@matkoniecz
same location with intermittent pattern:
https://www.openstreetmap.org/#map=18/45.92935/6.12104

[jragusa]

@matkoniecz and @kocio-pl Are you agree to apply intermittent water body pattern to the basin=retention, basin=detention and basin=infiltration tags ?

[kocio-pl]

Reading Wikipedia articles and short description on OSM wiki I understand that basin=retention is called wet pond, because it does not loose water, so I would leave it as it is. But basin=detention and basin=infiltration are meant to loose water over time, so it makes sense to me to render them as intermittent.