[Tagging] layer=-1, rivers, bridges and tunnels

Fernando Trebien fernando.trebien at gmail.com
Fri Mar 14 16:19:46 UTC 2014

I think that adding "layer" to every bridge instead of the river alone
is a wasteful and inefficient approach (takes more time and uses more
database space). IMHO these are much more objective arguments than
simply calling something you disagree with "laziness".

What's wrong with "removing layer=-1" in these cases: it may actually
be semantically correct (as it is in my city: Porto Alegre). All
bridges have been mapped with layer=0 and the river beneath them with
layer=-1. Not a single bridge is missing. (This was checked before
adding the layer tags.)

On Fri, Mar 14, 2014 at 1:06 PM, Florian Lohoff <f at zz.de> wrote:
> On Fri, Mar 14, 2014 at 05:01:10PM +0100, Pieren wrote:
>> On Fri, Mar 14, 2014 at 4:48 PM, Richard Z. <ricoz.osm at gmail.com> wrote:
>> > wiki says that every bridge should have a layer tag. If you are lazy
>> > you can as well omit the layer altogether, it will be still rendered
>> > correctly.
>> It's not a question of laziness. Setting "layer=-1" to the waterway
>> instead of 10 bridges just demonstrates that you understood the
>> original concept of the tag "layer".
> Still i feel setting a layer -1 on a waterway and NOT tagging any
> bridges is lazyness. I remove the layer=-1 in those cases and wait
> for keepright to come up with layer violations.
> Flo
> --
> Florian Lohoff                                                 f at zz.de
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Fernando Trebien
+55 (51) 9962-5409

"The speed of computer chips doubles every 18 months." (Moore's law)
"The speed of software halves every 18 months." (Gates' law)

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