[OSM-talk] Key:layer update

Dave F. davefox at madasafish.com
Sun Mar 9 12:17:44 UTC 2014

On 09/03/2014 12:03, Martin Koppenhoefer wrote:
>> Am 09/mar/2014 um 12:35 schrieb "Dave F." <davefox at madasafish.com>:
>> This is not my understanding of the layer tag. It is a tool to help renderers place objects on top of each other & has no real world implication in differences of height.
> it has implications on real world topology: it says which object is above and which below when they cross, it is not only for rendering

Disagree. A bridge at the top of Everest would be tagged 'layer=1' 
exactly as it would be if in Death Valley (86m below sea level)

>> For instance if you had an area tagged 'park' & another area within it tagged 'lake' you could add a 'layer' tag to 'lake' to ensure the render displayed it.
> -1, you should not add any layer in this case (tagging for the renderer)

The correct expression is 'don't tag incorrectly for the renderer'. 
There's /nothing/ wrong in making OSM data clearer & more accurate.

Dave F.

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