Zh-hant:WIWOSM

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WIWOSM - Other languages
德語維基百科截圖：奧地利條目的座標資料（紅色部位）

WIWOSM (Wikipedia where in OSM，也就是「維基百科在開放街圖計畫中位置」的意思) is a project to show for a Wikipedia article geometric objects from OpenStreetMap. These objects have a matching Wikipedia tag. The usage of WIWOSM will be primarily at maps inside Wikipedia (OSM-Gadget and WikiMiniAtlas).

Help us!
fix the tagging errors
Example page

http://toolserver.org/~kolossos/openlayers/kml-on-ol-json3.php?lang=en&title=Austria
is the same as:
http://toolserver.org/~kolossos/openlayers/kml-on-ol-json3.php?lang=de&title=%C3%96sterreich

Shows Austria on the map. The title-parameter in the URL is the Wikipedia article in the english Wikipedia, instead the OSM-relation for Austria use the tagging for German Wikipedia: wikipedia=de:Österreich. The existing Wikipedia-side interwiki language links from Wikipedia area indexed, so only a single extra tag is needed on the OpenStreetMap side, and this can be any one of the Wikipedia language articles.

優點

Objects which can be referred to using WIWOSM don't need to be "hardlinked" anymore. Up to now the only possible way to link a certain object was to refer to its OSM-ID. The problem here is that the ID can change and thus breaks the link.

對維基百科的好處：

The project will give users of wikipedia with one click a detailed view on complex geographical objects like rivers, streets and districts. So it increases the potential of wikipedias geocoding where an article gets only a point by the possibility to describe additionally complex lines and polygones. The geometry from OSM helps us also to bring the map to the right zoomlevel.

WIWOSM will connect the Wikipedia content with the opportunities of a Geographic information system. So we can say e.g. how large an article object is or which articles are in an other...

對OSM的好處：

OpenStreetMap can show with this project for many people that it is more than a map, instead it's a database with a lot of use cases. OpenStreetMap can win with the wikipedians a lot of new users this will help to ensure the quality. The connection to Wikipedia will also help to translate a lot of objects into different languages.

其他範例：關於一條德國微型鐵路(a miniature railway)的條目 [1]。它使用火車站的節點(points)、鐵道的路線(lines)、以及火車調度場(rail yard)的區域(poligons)

物件類型(Object types)

OpenStreetMap has different representations for objects. This means a place can be represented by a node (a single point) or a multipolygon (an area). We want the most complex representation for this project. A single node brings us no additional information on the map compared to the usual geocoding in Wikipedia. On the other hand the place node for a city has a lot of additional data so it would be nice to connect it with Wikipedia.

Other use-cases like the usage of waterway=river or waterway=riverbank needs further discussions of the community. Please use the discussion page here.

The project idea is very good and simple to bring many OSM objects to one Wikipedia article. In the reverse it is not possible to tag one OSM object with more than one Wikipedia article. As solution for that we see the usage of relations.

Please have in mind that the scope of Wikipedia and OpenStreetMap differs at some points. So please do not add things to OSM that are out of project scope like historic stuff or ranges of specimen. We hope to solve this problem later with other projects, like http://en.wikipedia.org/wiki/Template:Attached_KML.

You should also respect that the system has limits. So if you want to tag all post boxes in the world for the article "Post Box", it will not work and you will see protest from OSM-community. Please discuses such ideas before. The system seems also not good for collecting articles in Wikipedia like Streets in Oslo. If you want to have maps in Wikipedia for this it's perhaps better to ask the Wikipedia Map workshop.

技術流程(Technical procedure)

資料基礎(Data basis)

The project use the data of the mapnik-database on toolserver.org. This brings sometimes a larger replication delay: munin-stat

過濾維基百科標籤(Filtering by Wikipedia-Tag)

OSM has a lot of ways to use the wikipedia=* tag, and we try to support most of them. But we believe it would be best to always use the preferred method: wikipedia=lang:article.

Key value support
wikipedia lang:article prefered tagging scheme. One tag is enough!
wikipedia:lang article works, too. If multiple wikipedia tags are found, we use the first we can get. We get other languages from Wikipedias Interlanguage links
wikipedia http://lang.wikipedia.org/wiki/Article is parsed (also with https)
wikipedia:lang http://lang.wikipedia.org/wiki/Article is parsed, too (also with https)
wikipedia article is shown in the broken.html log. We need a defined language and don't want to guess one! Please help to fix it!


Please make sure you don't use a name which gets redirected in Wikipedia.
Example: http://de.wikipedia.org/wiki/Frasher gets redirected to http://de.wikipedia.org/wiki/Frashër, but Frasher at WIWOSM doesn't work.

WIWOSM supports anchors seperated by '#' for objects without an own article but with an entry in a list article. So you can use Wikipedia=lang:list-xy#object. As disadvantage this will be not so stable like full article names and doesn't support interwikilinks. Linked Wikipedia articles are possible to jump exactly to the right position: Example (A church in a list of churches).

登入(Logging)

Attention, please! Now the log shows every wikipedia tag, that has no specified language and so it is very long! (about 44000 Objects) Please help to make it smaller by fixing some tags! ;)

We have now a simple logging enabled to find some bugs in wikipedia-tags or in WIWOSM processing of them.
Check this list of all entries that havn't got a valid wikipedia language and use it for debugging the problems.
http://toolserver.org/~master/wiwosmlog/broken.html Based on the JSON is a statistic page and a tab-separated-values (TSV), too. See this spreadsheet for an analysis example. You can even use a simple filter to focus on e.g. relations in germany. This works with the other fields too!

簡化(Simplification)

For objects with with a lot of points we use the PostGIS-function ST_SimplifyPreserveTopology() to reduce the data we send to the browser. We also reduce the decimal places. The simplify strategy at this moment is this: 

ST_AsGeoJSON(
  CASE
    WHEN ST_NPoints(ST_Collect(way))<10000 THEN ST_Collect(way)
    WHEN ST_NPoints(ST_Collect(way)) BETWEEN 10000 AND 20000 THEN ST_SimplifyPreserveTopology(ST_Collect(way),(ST_Perimeter(ST_Collect(way))+ST_Length(ST_Collect(way)))/500000)
    WHEN ST_NPoints(ST_Collect(way)) BETWEEN 20000 AND 40000 THEN ST_SimplifyPreserveTopology(ST_Collect(way),(ST_Perimeter(ST_Collect(way))+ST_Length(ST_Collect(way)))/200000)
    WHEN ST_NPoints(ST_Collect(way)) BETWEEN 40000 AND 60000 THEN ST_SimplifyPreserveTopology(ST_Collect(way),(ST_Perimeter(ST_Collect(way))+ST_Length(ST_Collect(way)))/150000)
    ELSE ST_SimplifyPreserveTopology(ST_Collect(way),(ST_Perimeter(ST_Collect(way))+ST_Length(ST_Collect(way)))/100000)
  END
,9) AS geojson

If you have a good idea to optimize it, let us know, please.

GeoJSON 與壓縮(compression)

We transfer the geometry to GeoJSON with a PostGIS function and put the files compressed on the server. The projection of the files is Google mercator.

Internationalisation;

We use the InterWikiLinks of Wikipedia to create hardlinks in the file system.
The filesystem structure is based on a hashing algorithm called FNV.
The process is as follows:

 1. build a String with the language followed by article with underscores replaced by spaces
 2. compute the fnv hash of this string for example 1A00A138 in hexadecimal format
 3. build the file path like /1A/1A00/1A00A138_lang_articlename.geojson.gz (with forbidden chars removed from lang and articlename and cropped at 230 chars)
 4. write the gzip compressed GeoJSON to that file
 5. for every other language found for an article by Interlanguag links do 1-3 and create a hard link in the filesystem to that file

The advantage of this procedure is a fast access to the right geojson file, if you know language and article, without database queries or such stuff. Also we are able to support simpler update strategies by only updating one file without lookup on interwiki links.

客戶端(Clientside)

On clientside we load the geometry in OpenLayers, WikiMiniAtlas or Leaflet (optional Vietnamese Wikipedia gadget). If the geometry is loaded and if it's not only a point, we zoom to it.

更新(Updating)

  • We will try to update each night. I optimized the procedure a little so there is a smart update (>34min) each day but wednesday. Wednesday the whole directory is thrown away and completely new generated (>84min). The smart update doesn't check if an OSM-object or its wikipedia tag was deleted or if new languages in inter language links in wikipedia were added. This is only done on full update.
  • If you add a new Wikipedia-Tag and can not wait, you can update with (URL:+"?...&action=purge"). This procedure is relative expensive for us and needs 30-60 sec to be finished, because we have to look up this article in the hstore of the mapnik db on toolserver.
    So if you can, please wait to next day and be careful with this feature (Don't send the URL to a mailing list.). Have also in mind that the toolserver database has a replication lag of some minutes, so please wait after your edit at least 5 minutes.

嵌入式軟體(API)

You can get the geojson file content of an article directly by calling: 

 http://toolserver.org/~master/osmjson/getGeoJSON.php?lang=de&article=Dresden

With a lang and article parameter. If it does not exist you get 404 Not Found.

If you want to explicit check if an wiwosm object is there without fetching its content you can use the action=check parameter for example 

 http://toolserver.org/~master/osmjson/getGeoJSON.php?lang=de&article=Dresden&action=check

gives 1 on existing objects and 0 otherwise.

If you explicitly want to regenerate a single WIWOSM-Object before the nightly update process you can use action=purge but use with care!

程式碼(Source code)

WIWOSM together with POIs from Wikipedia

實測列表(Lists for testing)

由開法者提供的範例(Examples by the author)

At the following list you can find some links to example maps:

更多實例

Toolserver Wikipedia Wikipedia tag in: Relation link
[2] Strategischer Bahndamm relation type=collection
[3] Residenzenweg relation type=superroute [4]
[5] Rhein relation type=waterway [6]

問答集

  • Feature xyz I added to the map isn't in Wikipedia yet

Check the log to see if data has been renewed since you edit, and if there are no problems with your data.

待辦項目

A lot of things are in the moment (April 2012) not in WIWOSM.
Help to bring more Wikipedia-Tags inside OSM.
WIWOSM in Europe (April 2012)

開發人員/聯絡方式

重大事件

  • 10.07.2012 WIWOSM is now running in all Wikipedia versions (not running in Internet Explorer)
  • 21.03.2012 WIWOSM starts it beta-phase and going live in German Wikipedia
  • after OSM license-change WIWOSM will go live in other Wikipedia

參見

  • Add-tags - web service to assist in adding wikipedia tags to OSM objects with the use of JOSM's RemoteControl feature
  • OSM-Wikipedia place name tool - on Toolserver
  • WikiMiniAtlas - Map widget based on OpenStreetMap data, active on many wikipedia sites; displays WIWOSM data
  • JOSM Wikipedia Plugin - A JOSM plugin which shows a list of Wikipedia articles regarding the area in which the user is mapping (by position or by category). It lets the mapper to add the wikipedia tag by a simple double click, and it also indicates the objects already delivered by WIWOSM server.
  • Osmose analyser - An Osmose wikipedia tag analyse. Partial world coverage.
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