RU:Standard tile layer

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Standard tile layer
OpenStreetMap Carto, osm-carto
Baclaran, Paranaque and Pasay Rotunda, Pasay
Baclaran, Paranaque and Pasay Rotunda, Pasay
Автор: Andy Allan and other contributors
Подвижная
карта:
openstreetmap.org
Usage policy: operations.osmfoundation.org/policies/tiles/
Лицензия
тайлов:
ODbL 1.0
Сайт
для стиля:
Font Awesome 5 brands github.svg gravitystorm/openstreetmap-carto
Стиль
лицензии:
CC0 1.0
Версия: 5.4.0 releases (2021-09-23)

A general-purpose OpenStreetMap mapnik style, in CartoCSS

Standard tile layer — это картостиль по умолчанию на домашней странице the OpenStreetMap. Он часто называется OSM Carto или osm-carto, так как основан на таблице стилей Font Awesome 5 brands github.svg OpenStreetMap Carto[1].

Отчеты об ошибках можно сообщать Font Awesome 5 brands github.svg сюда (для самого стиля, например. проблемы рендеринга конкретных классов объектов) или Font Awesome 5 brands github.svg сюда (для реального рендеринга тайлов на OSM.org, кэширования и т.д.) – в обоих случаях необходим логин с учетной записью GitHub.

Развертывание серверов OSM

OSM homepage with standard tile layer

Тайловые серверы OSM используют стиль OpenStreetMap Carto с августа 2013 года.. OSM tileserver generation statistics are available, you can read also about the tiles rendering process.

Тайлы с низким и средним масштабом (z0–z12) обычно перерисовываются только при развертывании новой версии OSM Carto и в первое воскресенье каждого месяца.[2]. Изменения схемы базы данных не следует запрашивать чаще, чем 1–2 раза в год (вероятно, в сочетании с основным релизом PostgreSQL).

Если вы используете стандартные тайтлы с тайтловых серверов OSM в других приложениях, вы должны следовать Соглашению по использованию тайтлов.

Map key

Since this style is feature-rich, the short map key included on the OSM.org homepage is very limited. See Standard tile layer/Key and its subpages for the most complete and up to date legend version:

Основная статья: SymbolsTab
Основная статья: LinesTab
Основная статья: AreasTab

Основные изменения

Comparison of OSM Carto in 2017 with the old version (London, zoom level 10)
  • 2012 – перенос XML-версии на CartoCSS (запуск OSM Carto)
  • 2013 – развертывание тайловых серверов OSM.
  • 2014 – переписаны строительные нормы и правила.
  • 2015 – изменение стиля дороги, значки SVG.
  • 2016 – улучшенный рендеринг топонимов.
  • 2017 – заливки водоемов, улучшения среднего масштаба, изменение схемы базы данных.
  • 2018 – рендеринг офисных и медицинских объектов, новые цветовые категории POI.


Технические детали

Стиль

The style is designed as a general-purpose map of the world, so for example:

  • special objects (like seamarks or railway details) will not be rendered
  • labels are rendered with a name=* value (whatever it contains for a given object), so it's not displaying English names all over the world
  • there are no country-specific symbols (like for example road shields or subway/metro signs), they all have a uniform look

While OpenStreetMap Carto tries to show many different objects, it's not possible to render everything stored in a database, so opt-in selection is made.

Font Awesome 5 brands github.svg Use cases for some zoom levels are defined.

Mapnik and CartoCSS

OpenStreetMap Carto tiles are rendered using the Mapnik toolkit. That being said, OpenStreetMap Carto and Mapnik are not the same thing! Mapnik is a map rendering library used for many map stylesheets (including OpenStreetMap Carto).

CartoCSS is used to pre-process the stylesheet into Mapnik XML format (since August 2013).

Порядок рендринга

In this case upper residential area is larger than forest area and lower residential area is smaller than forest area

This style has multiple layers. For example, names of waterways are rendered over waterways, shops are rendered over buildings, tunnels are rendered over buildings, roads are rendered over landcover, etc.

The remaining question is how objects are rendered within layer. For some cases collisions are not allowed, and objects that would cover already rendered object from given layer are not rendered. It is done for example for cities, where labels for smaller ones that would collide with label for a larger one are not rendered.

Landcover areas are ordered by area, with smaller ones later, and collisions are allowed. It means that for a given layer smaller areas will cover larger ones.

For example, small leisure=park area will be rendered over larger landuse=residential area.

There is also a separate overlay layer containing for example tree symbols for forest landcover, that is rendered over landcover fill.

  • area covered by small landuse=forest and large landuse=residential
    • forest fill will be rendered over residential fill and cover it, later forest overlay will be rendered over that
  • area covered by large landuse=forest and small landuse=residential
    • residential fill will be rendered over forest fill and cover it, later forest overlay will be rendered over that

База данных

OpenStreetMap Carto uses as its standard database PostgreSQL with PostGIS geospatial extension and is named "gis". It is derived from the OSM database, but does not store the full dataset – only the rendering-related elements are available. Since v4.0.0, OpenStreetMap Carto uses the PostgreSQL hstore (extension and data type) and is pre-processed with Font Awesome 5 brands github.svg a lua script by the osm2pgsql tool.

структура кода

General project configuration is included in Font Awesome 5 brands github.svg project.mml (YAML). There are defined so called "layers", which include mainly SQL statements selecting the objects, while actual styling is done in multiple MSS files.

Roads code is very complex and is partially generated by the helper scripts.

Значки и узоры заливок

Icons are pixel-aligned vector images (SVG), generally based on 14 px matrix. While most of them are monochrome and their rendering color is defined in the MSS files, some of the icons have more than one color; in the latter cases, the colors are defined in the vector file itself. Halftones might be used.

Some patterns are also done as vector images, but if they are still raster images (PNG), they are derived from vector elements and the process is Font Awesome 5 brands github.svg documented, so it should be easy to migrate to a vector format when possible.

Шрифты

По возможности используется шрифт Noto, а в качестве запасных — DejaVu Sans, Hanazono и Unifont.

Сторонние ресурсы

The style relies partly on some external data files coming from Natural Earth and preprocessed OSM data repository OpenStreetMapData. They can be updated with a Python script (Font Awesome 5 brands github.svg scripts/get-shapefiles.py) or by hand.

Rendering coastline on openstreetmap.org is described here: Coastline#Rendering in Standard tile layer on openstreetmap.org.

Contributing and installing

You can set up a copy of the OpenStreetMap Carto rendering stylesheets for yourself. For more technical information, including setup instructions, see Font Awesome 5 brands github.svg gravitystorm/openstreetmap-carto on GitHub:

If you still don't know where to start, just ask for the assistance (for example in the ticket comments).

More experienced developers are also very welcomed. Some complex tasks that need attention are:

Forks and independent deployments

Apart from OSM.org deployment, osm-carto is being used for different independent services, like OSM Japan or Geofabrik Maps.

OpenStreetMap Carto is used as a base for other map style rendering forks, especially:

Vector-based solutions and testing:

There is also a separate project called OpenGeofiction (OGF), which uses OSM tools – including osm-carto as default style – for creating maps of fictional places.

External links

General:

History:

Blog posts:

Talks:

Footnotes