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OCM: some scrambled rendering at zoom levels 15 and 16 #5242

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openstreetmap-trac opened this issue Jul 23, 2021 · 2 comments
Open

OCM: some scrambled rendering at zoom levels 15 and 16 #5242

openstreetmap-trac opened this issue Jul 23, 2021 · 2 comments

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@openstreetmap-trac
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Reporter: Viajero Perdido
[Submitted to the original trac issue database at 10.41am, Tuesday, 21st October 2014]

I've noticed some "confused" rendering by OCM of relatively recent changes, at zoom levels 15 and 16 only, whereas at higher or lower zooms everything renders as intended. Two examples:

  1. http://opencyclemap.org/?zoom=17&lat=53.33824&lon=-112.98145&layers=B0000
    Here the winding trail and forest polygons render correctly. If you zoom out to 16 or 15, however, the trail becomes a long straight-line segment, and the forest polygons are either missing or scrambled. (I've added these objects about a month ago, and noticed this odd rendering for several weeks at least, whereas the other OCM zoom levels, and the other OSM derivative maps have stabilized with the new content.)

  2. http://opencyclemap.org/?zoom=16&lat=53.52734&lon=-113.48686&layers=B0000
    Here there are two overlapping trails at zoom levels 15 & 16. Another editor accidentally deleted the trail, and I later added my own version of it (way 309313359). So the two would never have existed at the same time in the database. Yet they both render simultaneously at these two zoom levels only.

@openstreetmap-trac
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Author: Viajero Perdido
[Added to the original trac issue at 5.09pm, Monday, 27th October 2014]

PS, it's worth noting that in the first example, the trail never existed in the database as a long straight-line segment. (I entered that trail as many short segments before saving, via the JavaScript editor.)

@openstreetmap-trac
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Author: Viajero Perdido
[Added to the original trac issue at 3.05am, Tuesday, 28th October 2014]

Update: the straight-line trail segment I mentioned is now a missing segment. (A few days ago I split the trail in two as an attempt to un-break the rendering. Still broken.)

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