Hi, maybe one reason why Joburg is below the Gauteng average: we've been actively capturing shopping centres (as comprehensively as possible) using data from the South African Council for Shopping Centres. It forms part of one of our research projects in transport modelling. We also capture the service roads and parking aisles... note that these have tags:
highway=service and the parking aisles have an additional tag: service=parking_aisle We started with Gauteng, and look at, for example http://www.openstreetmap.org/?lat=-25.87826&lon=28.16376&zoom=17&layers=M and http://www.openstreetmap.org/?lat=-26.01694&lon=28.00689&zoom=16&layers=M ... and you'll quickly see that there are MANY roads that don't have (and don't NEED) names. I think all-in-all the OSM is improving quite rapidly. And with the National Geospatial Institute data coming online in the near future, progress will accelerate even further. WELL DONE OSM COMMUNITY! In the near future we will be the culprits when Eastern Cape's road-name-percentage will quickly be dropping too ;-) ... and then the rest of the country. I guess we just need to find another, or tweak the metric a bit: maybe you can check what the percentages are if we IGNORE service roads. Johan (OSM: JohanWJoubert) >>> 03/02/12 2:01 PM >>> Send Talk-ZA mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.openstreetmap.org/listinfo/talk-za or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Talk-ZA digest..." Today's Topics: 1. 53% of South Africa's roads in OSM are named? (Damjan Jovanovic) 2. Re: 53% of South Africa's roads in OSM are named? (David Richfield) 3. Re: 53% of South Africa's roads in OSM are named? (Glen Wilson) ---------------------------------------------------------------------- Message: 1 Date: Thu, 1 Mar 2012 19:24:47 +0200 From: Damjan Jovanovic To: [email protected] Subject: [OSM-Talk-ZA] 53% of South Africa's roads in OSM are named? Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Using JOSM with the search filters: "type:way highway:" to select and count all roads "type:way highway: (name: | ref:)" to select and count all roads that have names or refs and roughly assuming real-world road = OSM way I get the following statistics: Johannesburg, from http://metro.teczno.com/ 51866 roads 20842 roads with names 40.18% of roads are named The provinces below are from http://downloads.cloudmade.com/africa/southern_africa/south_africa/gauteng#downloads_breadcrumbs and co. Gauteng 62105 roads 27222 roads with names 43.83% of roads are named Eastern Cape 21794 roads 9455 roads with names 43.38% of roads are named KZN 46943 roads 37193 roads with names 79.23% of roads are named Limpopo 4215 roads 1407 roads with names 33.38% of roads are named Mpumalanga 22075 roads 9060 roads with names 41.04% of roads are named Northern Cape 9261 roads 2500 roads with names 26.99% of roads are named Free State 14191 roads 5486 roads with names 38.65% of roads are named Prince Edward Islands no roads are listed North West 35554 roads 14886 roads with names 41.87% of roads are named Western Cape 60505 roads 39916 roads with names 65.97% of roads are named Obviously this isn't fully correct since roads running between provinces will be counted twice, but: Total roads for SA: 276643 Total named roads for SA: 147125 (53.18%) Some further questions to ponder: How did KZN get so many roads named? Why is Joburg's road naming below the Gauteng average? Does Limpopo really have only 4215 roads? Is there really no roads on the Prince Edward Islands or are they not captured? In Joburg, so few streets are named that most people and places I visit weren't on it until I added them. What can we do to improve this sad situation? The relative road to province percentage conversion for Gauteng is as follows: 1 road = 0.00161017% 10 roads = 0.0161017% 100 roads = 0.161017% 1000 roads = 1.61017% 621.05 roads = 1% Should we summarize this on the OSM Wiki page for South Africa? Thank you Damjan ------------------------------ Message: 2 Date: Fri, 2 Mar 2012 07:21:07 +0200 From: David Richfield To: Openstreetmap ZA Subject: Re: [OSM-Talk-ZA] 53% of South Africa's roads in OSM are named? Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Interesting analysis! I'd definitely say you should post it to the wiki, but I have no sensible commentary to contribute. -- David Richfield [[:en:User:Slashme]] +27718539985 ------------------------------ Message: 3 Date: Fri, 2 Mar 2012 13:28:56 +0200 From: Glen Wilson <[email protected]> To: Openstreetmap ZA Subject: Re: [OSM-Talk-ZA] 53% of South Africa's roads in OSM are named? Message-ID: Content-Type: text/plain; charset="iso-8859-1" I think the best place would be a new page under the Progress Tracking heading of our wikiproject page. Perhaps, though, it should simplified statistics with a date (e.g. RSA has x km of road, of which x% is gravel, y% is ..., and 53% is unnamed -- 2 Mar 2012). One thing I would caution is that this type of data has the shelf-life of a dairy product (maybe the long-life type in this case). Eventually it will become outdated unless the ubiquitous "they" keeps the wiki up to date. Durban data was imported from data from the eThikwini (spelling?) municipality (look under import coordination). Gauteng is often only from traced aerial imagery, therefore few names unless somebody on the ground survey's it. People generally trace what they're interested in, so that probably explains the low road count in Limpopo. Prince Edward islands are only populated by a few scientists, and I think they're also declared as nature reserves, hence no infrastructure at all. The best way to fix unnamed roads is to get out there and get the data. And when street signs are missing, urban areas contain many other clues about a street's name. So with a bit of work it is possible to get the good majority of names. Mapping party? Glen (~Tinshack) On 02 Mar 2012 7:22 AM, "David Richfield" wrote: Interesting analysis! I'd definitely say you should post it to the wiki, but I have no sensible commentary to contribute. -- David Richfield [[:en:User:Slashme]] +27718539985 _______________________________________________ Talk-ZA mailing list [email protected] http... -------------- next part -------------- An HTML attachment was scrubbed... URL: ------------------------------ _______________________________________________ Talk-ZA mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-za End of Talk-ZA Digest, Vol 106, Issue 1 ***************************************
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