[Talk-GB] Rendering of layers

Stuart Reynolds stuart at travelinesoutheast.org.uk
Thu Jan 21 11:22:54 UTC 2016

Personally I think that Reading is cheating.

The outline that is called the railway station “building” includes the ticket halls, the bridge, and the platform surfaces to the extent that these stick out of the bridge area. I don’t agree with this - the last time I looked, a platform wasn’t a building; it is a platform. I would expect this to be a site relation - and in fact, Euston appears to be mapped that way, so it doesn’t look like I’m a million miles out with that thought.

Next, the individual “platforms" have been mapped as edges alongside the satellite-visible parts of the platform areas. The platforms in OSM don’t extend under the footbridge - when in reality they do. Again, at Euston the platforms are areas (split in half to allow tagging of each platform number). Yes the bridge at Reading is marked as a bridge, which it allows it to go over the tracks. But it really is a bridge at Reading. At Gatwick it is a whole building over the tracks.

So, to me, Reading looks like it has been mapped for the renderer, rather than representing what is physically on the ground.


Stuart Reynolds
for traveline south east & anglia

On 21 Jan 2016, at 10:34, Richard Mann <richard.mann.westoxford at gmail.com<mailto:richard.mann.westoxford at gmail.com>> wrote:

Compare Reading - are you mapping a roof or a groundplan, or a pedestrian bridge?

On Thu, Jan 21, 2016 at 10:12 AM, Stuart Reynolds <stuart at travelinesoutheast.org.uk<mailto:stuart at travelinesoutheast.org.uk>> wrote:

I made a number of adjustments around the transport terminus at Gatwick Airport South Terminal yesterday. When this was first mapped, what is actually three buildings (the railway station, the covered travelators from the bus station & car parks, and the southern stairs from the railway platforms) were all mapped as one building, and the platforms were “inserts” into the gaps rather than being the continuous entities that they are. So I have separated those all out, and made the platforms a continuous block. I also added internal escalators and travelators, although that is immaterial to the question that I’m about to ask.

The buildings are all mapped as layer=1, and the platforms without any layer tag (which should default them to layer=0, AFAIK). So why are the platforms and rail tracks (which I haven’t touched) been rendered over the buildings, rather than under them?

See http://www.openstreetmap.org/#map=18/51.15634/-0.16124


Stuart Reynolds
for traveline south east & anglia

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