[Talk-ca] Islands with coastlines not showing up in OSM

Denis Carriere carriere.denis at gmail.com
Wed Feb 24 18:28:14 UTC 2016

Thanks Adam,

Your answer & the osm wiki bring clarity to my question, I guess I'll just
have to be patient and wait until the coastline geometry gets processed on
the OSM servers.


*Denis Carriere*
*GIS Project Manager*

*Twitter: @DenisCarriere <https://twitter.com/DenisCarriere/>*
*OSM: DenisCarriere <https://www.openstreetmap.org/user/DenisCarriere>*
GitHub: DenisCarriere <https://github.com/DenisCarriere>
Email: Carriere.Denis at gmail.com

On Wed, Feb 24, 2016 at 1:08 PM, Adam Martin <s.adam.martin at gmail.com>

> Hey Denis,
> Changes to the coastline takes time to pass through the tile rendering. If
> I recall correctly, the coastal tiles may take several weeks to update and
> require manual intervention. Looking at the Wiki, I see this (
> http://wiki.openstreetmap.org/wiki/Coastline): "*Coastline rendering in
> Standard tile layer
> <http://wiki.openstreetmap.org/wiki/Standard_tile_layer> may update later
> than other rendering changes. To avoid major disruptions of map rendering
> due to data errors the coastline is not automatically updated if there are
> larger changes in the geometry compared to the last time it was
> successfully processed. For example any addition or removal of a lake with
> coastline tag will require manual intervention.*"
> The same page also notes that "*At low zoom levels (used for z0-9), up to
> and including zoom level 9, Mapnik
> <http://wiki.openstreetmap.org/wiki/Mapnik> renders all the sea as a solid
> fill of blue, generated from the shapefile
> simplified-land-polygons-complete-3857.zip
> <http://data.openstreetmapdata.com/simplified-land-polygons-complete-3857.zip>,
> which has a relatively low resolution. At higher zoom levels the coast
> polygons used are generated from a larger shapefile
> (land-polygons-split-3857.zip
> <http://data.openstreetmapdata.com/land-polygons-split-3857.zip>) which are
> automatically generated almost daily from planet dumps + diffs (note: if
> you edit the coastline then you have to be patient for the result of the
> changes to render at the higher zoom levels).*" If your changes are very
> recent, it may not be showing up as the tiles have not been rendered. If
> they are older, check to make sure that the polygons are closed loops so
> that the renderer knows what to do with them.
> Adam
> On Wed, Feb 24, 2016 at 2:27 PM, Denis Carriere <carriere.denis at gmail.com>
> wrote:
>> Quick question for anyone on this mailing list.
>> We are having issues displaying islands up in northern Canada, some
>> islands are showing up correctly and some do not.
>> We seem to have all the tagging correct and the correct geometry
>> (validated with JOSM the coastline so it's not reversed).
>> Any reason why it's not showing up properly in OSM? Is there a delay of
>> 24+ hours for any features that are related to the coastline?
>> Here is one of many features that are not getting rendered:
>> *Thomas Work Island, Nunavut (Not showing up)*
>> https://www.openstreetmap.org/way/398936588
>> *OSM Tags*
>> name=Thomas Work Island
>> natural=coastline
>> place=island
>> source=NRCan-CanVec-10.0
>> Any ideas anyone?
>> *~~~~~~*
>> *Denis Carriere*
>> *GIS Project Manager*
>> *Twitter: @DenisCarriere <https://twitter.com/DenisCarriere/>*
>> *OSM: DenisCarriere <https://www.openstreetmap.org/user/DenisCarriere>*
>> GitHub: DenisCarriere <https://github.com/DenisCarriere>
>> Email: Carriere.Denis at gmail.com
>> _______________________________________________
>> Talk-ca mailing list
>> Talk-ca at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/talk-ca
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