Chris Morley wrote: > I have started a new thread with a measure for completeness in the title > because this is an important topic for OSM. But the response to the > recent posts quoted above, and my raising of it last July, has been only > luke-warm.
I've added http://wiki.openstreetmap.org/index.php/Straßenschlüssel to the wiki, a German description how to measure completeness: Completeness may be verified most easily for roads. Primary/secondary/.. are listed on most maps. The approach here is focused more on residential: 1) various sources for lists of roads: You may take names from city maps, get them from postal area codes, from telephone books, from address collections and many other sources. 2) encoding of valuable stuff There's a German system how an address may be encoded. It's based on the abbreviations which are used for car plates, an official key for the community, an official list of roads, the house number and the first letters of one's name. This official list of roads assigns a five digit number. This list does include especially all addresses where someone lives. Thus minor tracks or not necessarily included: The finer details differ from community to community. Roads outside the residential areas are not part of these lists. This encoding system is called "FEIN" or "EIN". It is recommended by the police. The road lists (German: "Straßenschlüssel") are used for other tasks as well (statistics, ownership, tax, maintenance, ...). The German cycling club (ADFC) uses this system for bicycle encoding as a matter of theft protection. That's why they offer a web service to obtain the personal EIN code for anyone: <http://fa-technik.adfc.de/code/ein> 3) opengeodb On the ADFC site there's a another web interface for the opengeodb data maintenance, which holds information about many places in Central Europe <http://fa-technik.adfc.de/code/opengeodb.pl>. These combined datas, the road lists and the opengeodb info, can be used to match OSM data and highway tags. The result is a certain measure of completeness, how many percent of those roads have been tagged by now. It does not include any other stuff that is worth tagging (where it may be more difficult how to measure completeness) and it does lack many tracks or details about the quality of the data (lanes, speed limits, total length etc.) Three larger federal states have been processed by now, see http://wiki.openstreetmap.org/index.php/Category:Statistics -> Baden-Württemberg -> Nordrhein-Westfalen / North Rhine-Westphalia -> Bayern / Bavaria -> Oberbayern -> Niederbayern One result is a number in percent how many of those residential roads have been tagged. As another result, a second phase may be applied to identify incorrect spellings: see http://wiki.openstreetmap.org/index.php/Talk:Baden-Württemberg#Korrekturvorschläge (suggestions for fixes) I guess that road lists are available almost everywhere. Does anyone else do a match for larger regions, instead of the local area? - Martin _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk