Re: [OSM-dev] Water polygon shapefiles for Openstreetmap-carto

[ika-chan! (OpenStreetMap)]

Hi, will this mean that the coastline will eventually no longer need to follow 
a particular direction?

Best,

— ika-chan!

> On 26 Feb 2019, at 03:18, Joseph Eisenberg  wrote:
> 
> The maintainers of Openstreetmap-carto would like to switch to water polygons 
> instead of land polygons. 
> 
> However, some users reported problems with the simplified water polygon 
> shapefiles when this change was attempted in 2016. We believe the problem is 
> no longer present, because the German map style is using these shapefiles 
> without problems, but it needs testing. 
> 
> If you were one of users who had
> problems with the simplified-water-polygon shapefiles or if you’ve seen 
> problems with rendering the current German fork on your setup, please let us 
> know, and try out the change on your server. 
> 
> The branch is available at: 
> https://github.com/jeisenbe/openstreetmap-carto/tree/ocean-polygons 
> 
> 
> New PR: 
> https://github.com/gravitystorm/openstreetmap-carto/pull/3694 
> 
> 
> Old issue: 
> https://github.com/gravitystorm/openstreetmap-carto/issues/2101 
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Re: [OSM-dev] Water polygon shapefiles for Openstreetmap-carto

[Jochen Topf]

On Tue, Feb 26, 2019 at 09:14:16AM +, ika-chan! (OpenStreetMap) wrote:
> Hi, will this mean that the coastline will eventually no longer need to 
> follow a particular direction?

No. The mapping of the coastline will not change.

Jochen
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Re: [OSM-dev] Water polygon shapefiles for Openstreetmap-carto

[Joseph Eisenberg]

> Hi, will this mean that the coastline will eventually no longer need to
follow a particular direction?

No, the coastline still needs to be correct. The land polygons and (ocean)
water polygons are created with almost the same process, they both use the
OSM coastline as a source. See openstreetmapdata.com for the details:
http://openstreetmapdata.com/data/water-polygons
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Re: [OSM-dev] Water polygon shapefiles for Openstreetmap-carto

[Michael Reichert]

Hi,

Am 26.02.19 um 10:14 schrieb ika-chan! (OpenStreetMap):
> Hi, will this mean that the coastline will eventually no longer need to 
> follow a particular direction?

No, the coastline still has to follow a particular direction.

Many map styles (e.g. OSM Carto) do not load OSM coastline ways directly
from their rendering database but use land or sea polygons and coastline
linestrings from openstreetmapdata.com as shape files.

openstreetmapdata.com uses the OSMCoastline tool to convert the
coastline ways from OSM to land polygons, sea polygons and a curated set
of coastlines as linestrings. In order to be able to convert the
linestrings into polygons, it is required to know which side of a way is
land and which is sea because we don't map continents or oceans as
mutlipolygons.

Please note that we do not map for a specific map style only.

Best regards

Michael


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