[OSM-talk] Layers and landuse

[Warin]

On 29/06/2015 9:34 AM, Martin Koppenhoefer wrote:
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> sent from a phone
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>> Am 29.06.2015 um 00:42 schrieb Warin <61sundowner at gmail.com>:
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>> If lower than the 'original ground level' then layer=-1 (or more)
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> "layer" are tags to map relative local stacking (which object is above which other object where they overlap), it has nothing to do with original ground level. Where objects do not overlap, the tag is meaningless.
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There should be a reference point, so that what one mapper maps can be verified by another mapper.

I use the 'original ground level' as that reference point and call it level 0.

If you used level 2 it would work ... but the next mapper could use level -2 .. and it would look rather strange .. especially if the two were linked .. the link would need to go from one level to the other.. other wise the link would not be to teh correct layer/level. If both mappers use the same reference problems are reduced.