Suggest to mappers via the UI (or a validator warning) that adding data at (0,0) is probably an error

[SomeoneElse2]

A recent change in JOSM seems to have made untagged nodes at "null island" (latitude 0, longitude 0) much more likely. ​http://www.openstreetmap.org/node/4975940278/history is the latest example of this.

Would it be possible to indicate to mappers that they shouldn't do this?

There is one thing around null island - a weather buoy, and it has tags. Anything new added there, especially with no tags, is very likely to be an error.

From trying to talk to the mappers adding these nodes, I've not managed to get a button-by-button "how to reproduce" from them, but it seems to be something like:

o Try and add something
o Decide not to
o End up adding an untagged node at lat 0 long 0.

[Don-vip]

I'm working to implement it in MapCSS:

node[at(0.0,0.0)] {
  throwError: tr("bad boy!");
}

Anyone got a better error message? :)

[Don-vip]

In 12514/josm:

see #15035 - add new at(lat,lon) MapCSS selector function

[Klumbumbus]

Replying to Don-vip:

Anyone got a better error message? :)

We need to exclude ​osmwww:node/3815077900

/* #15035 */
node[osm_id()!=3815077900][at(0.0,0.0)] {
  throwError: tr("Object at Position 0.00E 0.00N. There is nothing at this position except an already mapped weather buoy.");
  fixDeleteObject: this;
}

[Don-vip]

The id is not stable, it would be better to allow [man_made=monitoring_station] in case the object is deleted and created again.

[Klumbumbus]

Yes, but I think that if someone deletes it, a power mapper will revert it instead creating a new id. Atleast thats the way it worked for this buoy until now when looking at the history of this node in JOSM. However if we add fixDeleteObject: this; it would be a bit safer to use [man_made=monitoring_station] in case a new id is created indead.

[Don-vip]

Commit what you think is the best solution :)

[Klumbumbus]

i18n impact

[Klumbumbus]

In 12572/josm:

• fix #15097 - warn if ferry route way is not properly connected
• don't warn about bridge and tunnel on ferry routes
• see #14807 - don't warn about unknown noref=yes
• fix #15035 - warn for objects at null island (except the weather buoy)