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Best of OSM: Ein Mapping Trip in Nangarhar

2.01.2012 | Christine Karch

Ich habe die Zeit zwischen den Jahren genutzt und Best of OpenStreetMap um einige interessante Beispiele erweitert.

Wer Best of OpenStreetMap noch nicht kennt: Es dokumentiert Meilensteine der OpenStreetMap Entwicklung. Wir zeigen herausragende Mapping-Beispiele, wenn sie eine historische Bedeutung haben oder wenn es sich ganz einfach um besonders interessante Stellen handelt.

Besonders erwähnenswert finde ich den Mapping Trip in die Regionen Beshood und Surkhrod in der
Provinz Nangarhar. Werft auch einen Blick auf diesen durchaus informativen und interessanten Blog aus Afghanistan: Jalalalaa Good!

Gleichzeitig möchte ich diese Gelegenheit nutzen, um mich vorzustellen: Seit August 2011 bin ich Mit-Geschäftsführer-/Inhaberin der Geofabrik. Ich komme aus dem Bereich der Web-Entwicklung und werde die Geofabrik insbesondere hier verstärken. Davor habe ich 9 Jahre bei plan b und 3 Jahre bei der 1&1 gearbeitet. Der OSM Community bin ich zum größten Teil noch unbekannt. Ich hoffe aber, dass sich das im Lauf der Zeit ändert, und werde meinen Teil zum Vorankommen des Projekts beitragen.

Our OSM Inspector web site is an important part of many a mapper’s toolbox. It has a series of, daily updated, debug views on OSM data, highlighting potential problems from invalid multipolygons over strange tagging or faulty geometries to missing address data.

The OSM Inspector, or OSMI for short, has several thematic views (like “geometry”, “tagging”, “boundaries”), each of which again supports a number of individually selectable layers that highlight a specific kind of problem. OSMI displays its results over an OSM base map, and you can select individual bug reports and get more information about them, or even download a list of errors for further processing. There’s extensive documentation on the OpenStreetMap Wiki.

Worldwide Routing View

While most views have always shown data computed in-house at Geofabrik, one of our views, the routing view, presents data that comes from an algorithm developed by Pascal Neis of OpenRouteService fame, and is sponsored by Skobbler. The routing view attempts to highlight obstacles to routing – mostly roads that are not connected when they should be, but also duplicate roads that may lead to strange routing results.

We do not have a sponsor for running this routing view world-wide on a daily basis right now, but we have run it once for the non-Europe part of the planet, and you can try it out here:

OSMI Routing View Non-EU

We’ll try to update this once a week or so. (The normal, sponsored routing view for Europe with daily updates is here.)

In all, OSMI has data collected by three different toolchains; one of them works globally and feeds e.g. the tagging, multipolygon, and general geometry debug views; the other two, including the routing view toolchain, currently do Europe only and would require re-writing or more hardware to cope with the whole planet.

Potlatch

It has always been possible to access OSMI views through WMS for use in other applications, especially as a background layer in editors. Users of the popular Potlatch editor were however unable to make use of this as Potlatch does not support WMS backgrounds. We have therefore configured OSMI to serve tiles as well. (We’re using the excellent open source MapProxy for that.)

If you are using Potlatch, you can now add any or all of the following background layers:

  • Geometry View: http://tools.geofabrik.de/osmi/tiles/geometry/$z/$x/$y.png
  • Places View: http://tools.geofabrik.de/osmi/tiles/places/$z/$x/$y.png
  • Tagging View: http://tools.geofabrik.de/osmi/tiles/tagging/$z/$x/$y.png
  • Highways View: http://tools.geofabrik.de/osmi/tiles/highways/$z/$x/$y.png
  • Multipolygon View: http://tools.geofabrik.de/osmi/tiles/multipolygon/$z/$x/$y.png
  • Address View (*): http://tools.geofabrik.de/osmi/tiles/addresses/$z/$x/$y.png
  • Boundaries View (*): http://tools.geofabrik.de/osmi/tiles/boundaries/$z/$x/$y.png
  • Water View (*): http://tools.geofabrik.de/osmi/tiles/water/$z/$x/$y.png
  • Routing View (*): http://tools.geofabrik.de/osmi/tiles/routing/$z/$x/$y.png
  • Routing View (non-Europe): http://tools.geofabrik.de/osmi/tiles/routing_non_eu/$z/$x/$y.png

Those marked (*), and additionally all the public transport views offered by OSMI, are currently only available for Europe. For the public transport views, use the URL components “ptri” (rail infrastructure), “ptnri” (non-rail infrastructure), “ptf” (ferries), “pts” (stops), “ptn” (network).

Note that the tiles for each view will always show all available layers at the selected zoom level; when using tiles, you cannot toggle the visibility of individual layers like you can when using OSMI through its web interface. Also, the key to colours and symbols is only available within OSMI. Therefore, even if you plan to use the tiles in your editor, it might make sense to familiarize yourself with the data presentation on OSMI first!

We hope that these changes help to further improve quality awareness and, in consequence, data quality in OSM, and we’re happy to work with potential sponsors on extending these services to support more frequent updates, additional analyses, or a wider geographical coverage.

Shiny New Shapefiles

19.09.2011 | Frederik Ramm

For years, Geofabrik has been supplying the world with OpenStreetMap Shapefiles – two kinds of them, in fact; there’s our popular download page which has free shapefile downloads for many places, updated daily, and there’s our extended shapefile service where we sell shapefiles that require more work, and processing time, than the free nightly builds.

Whereas the free nightly builds are very close to the source, simply taking OSM objects and converting them into shapefiles, the extended service, which is based on a different toolchain here at Geofabrik, has a well-documented feature catalogue which we are today releasing in version 0.6 with a ton of enhancements over the previous version. The extended service also encompasses a few useful preprocessing steps, like automatically converting area POIs to points and proper handling of large multipolygons. The extended shapefiles are made to order; the standard feature catalogue contains almost anything in OSM that is widely used, but clients can also request extra features to be added. Extended shapefiles are available for any area – the whole planet, a single continent, a single country, a city, or anything in between.

In addition to releasing our new feature catalogue for our extended shapefiles, we’ve also made a change to the free nightly builds; these now have a much-asked-for “landuse” layer that contains information from OSM’s tag of the same name.

(Eine deutsche Version folgt.)

More …

A Night at the Office

30.11.2010 | Frederik Ramm

We are sometimes asked how we produce the files on our download server. Read this if you are one of those asking.

It is 22:30 in Central Europe, and the lights come on in the Geofabrik office. (The HDD LEDs, that is.) One of the servers, named bonne, begins downloading the collected works of mappers around the world from the last 24 hours

osmosis --rri --simc --write-xml-change 2010-11-16-22:30.osc (duration 00:01:30)

and then applies them to a locally held, full copy of the OSM database (the “planet file”).

osmosis --read-xml-change 2010-11-16-22:30.osc --read-bin current-planet.osm.pbf --apply-change --write-bin new-planet.osm.pbf compress=none (00:28:09)

The newly created planet file is transferred to another server, named hammer, where a script converts it to a simple CSV-like format (the “tbf” format) and then analyzes and converts it in several steps, creating statistics and a number of shape files. The shape files are later copied to our off-site tools server where they are used by the OSM Inspector.

But bonne, of course, doesn’t sit idle. More …

Today we finally received our author’s copies of our brand-new English OSM book. Old news, you might say; after all, this was featured on opengeodata.org a month ago. But it took a while for the books to reach us here at Geofabrik — we’ve been told that the first batch of books had to be dispatched to the US immediately because of the high demand there!

As you probably know, Jochen and I published the first OSM book ever in spring 2008, in German; a second edition came out in 2009, and a third in 2010. The book is of course a niche product as books go — with roughly 4,000 copies sold altogether. But we’ve been getting great feedback from the community and were encouraged to do an English version basically from day one. And so we did! At first we toyed with the idea of doing the book on our own with a print-on-demand place like lulu.com but we tried a few and were unhappy with the results. It took us a while to find a proper publisher with whom we could work, but we finally found a great, if small, publisher in UIT (Cambridge, UK). Just as with the German book, we not only wrote the content, but also did the typesetting, layout, and book cover ourselves, and we are very pleased with the finished product. It looks, feels, even smells like a proper book.

OSM Book

We had great help from one of the old OSM hands in England, Steve Chilton, who made sure that the English version properly reflects the international aspects of OSM, and fixed up our translation. Like the German book, the English one has 384 pages, 32 of them in full colour. (The English language is a bit more concise than German, so we managed to squeeze in a few extra illustrations and examples!) It covers everything there is to know about OSM, from the origins and the community to web services, editors (with detailed descriptions of Potlatch and JOSM), how to render your own maps (including how to write Mapnik and Osmarender style sheets), and how to access OSM data through API, planet files, or diff updates.

If you’re serious about OSM, you should really get this book. (If only to prove to others that the project you’re spending half your waking life on is something serious, you know, something people write books about!)

The sad thing is, like so often with publishing, the distribution, or more specifically, amazon.com; you can order the book at bookdepository.co.uk (free shipping) and it is also in stock at amazon.co.uk, but amazon.com says it “ships in 1 to 3 weeks”. (Also, both amazon sites have the wrong cover image, reflecting an early draft.) I hope that these initial distribution problems will soon be flushed out. This is the one drawback of doing a traditionally printed book – the stuff has to be shipped from printers to wholesalers to retailers and all that takes time.

More information on the book is also at www.openstreetmap.info.