[Talk-GB] Invalid building levels and building (part) height license compatibility

SK53 sk53.osm at gmail.com
Mon Mar 18 15:31:45 UTC 2019

How very useful; had completely forgotten about this!

However, I don't think that is Neil's issue, which is that building:levels
should have integer values (or just possibly steps of a half). Some 3D
renders make assumptions about what a default height for a single storey
(level) will be. A good example is here:
https://demo.f4map.com/#lat=52.9755467&lon=-1.2013530&zoom=18 (I
accidentally typed the house number into the building:levels tag).


On Mon, 18 Mar 2019 at 15:13, Brian Prangle <bprangle at gmail.com> wrote:

> Try this site
> <https://buildingheights.emu-analytics.net/?x=-2.0983833663121914&y=53.529861700711535&z=8.405213088272887>:
> origin of building height data is Environment Agency LIDAR data under OGL
> Regards
> Brian
> On Sat, 16 Mar 2019 at 19:20, Neil Matthews <ndmatthews at plus.net> wrote:
>> Anyone mapping in Manchester might want to take a look for strange
>> fractional building:levels.
>> It's possible that some commercial editors found that they got better
>> results with open source 3D renderers by using ~0.75 per building level,
>> rather than the documented value of 1.
>> We recently had a spate of strange edits around Aztec West -- with some
>> 1-level mobile homes being labelled as 1.5 (presumably thought they were
>> a "scaled" two storey house when satellite mapping).
>> On a similar vein, what are acceptable data sources for building:height
>> -- and how far should one ask for proof that these haven't come from a
>> source that would be problematic to OpenStreetmap?
>> Cheers,
>> Neil
>> _______________________________________________
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>> Talk-GB at openstreetmap.org
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