OpenStreetMap

Gravesham Storming Up the Table

Posted by sdoerr on 15 March 2011 in English (English)

ITO World have a useful analysis tool comparing street-names recorded in OSM against those recorded in the OS Locator data set. http://www.itoworld.com/product/data/osm_analysis/main , but you may have to be registered and logged in to see it. They've done the analysis by local government area, giving a handy 'league table' of the completeness of each area (in terms of street-naming).

10 days ago, Gravesham was 142nd in the table, with 181 of its 1,133 street-names apparently missing. It was therefore rated 83.32% complete. As of today, it has risen to 76th position, with only 47 streets missing, and is now 95.23% complete.

It's been an interesting exercise resolving the discrepancies so far. Usually, the street-name is indeed missing from OSM, and in some cases this is because there is no street-sign on the ground (especially in rural areas - I've yet to find signs for Buckland Road, Wrangling Lane, Lockyers Hill, etc.). Discrepancies regarding apostrophes are extremely common (the ITO analysis separates these out as 'minor' errors), and for these I usually flag the other version as an alternative. Quite often, two street-signs for the same street will have different spellings, again often involving apostrophes, but also disagreeing about whether words are separate or joined together (e.g. Deneholm Road vs. Dene Holm Road).

Occasionally, the OS has clearly got it wrong, as in the three avenues in Northfleet which have been named '------ AVEUNE' in the Locator database, or the DRIVE which has become a DRLVE.

Location: Durndale, Northfleet, Kent, South East England, England, United Kingdom

Comment from Gregory Williams on 15 March 2011 at 11:42

It's great to see that the western parts of Kent are rising up the table too. I've been concentrating on the districts in East Kent. Dover district broke the 95% threshold overnight too, and Ashford district shot through the 75% threshold the other day (I think mainly due to mapping by TimSC).

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Comment from Strash on 15 March 2011 at 13:24

It's a great tool you have here. I wish we had the same thing in France !

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Comment from paulbiv on 15 March 2011 at 20:59

Congratulations to sdoerr.

I'm trying to get Medway to follow suit. There were quite large areas of the rural part that had been armchair mapped and therefore no street names. For Medway east of the river we've mostly got it down to recent developments, though there are a few patches. Don't particularly like wandering around the army married quarters area obviously mapping - and the army don't like putting up street names either.

I also use the Musical Chairs http://ris.dev.openstreetmap.org/oslmusicalchairs/ version to see what needs doing and check progress. It updates about a day ahead of the ITO world link above, though it seems like the same data.

It only records roads and names though, not public footpaths, bridleways or byways open to all traffic.

Probably turn restrictions more of a priority.

In the rural patches I've been trying to map businesses as well, as the chance of going back very soon to add detail is fairly small. Street numbers to do though.

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Comment from TimSC_Data_CC0_To_Andy_Allan on 15 March 2011 at 21:07

Yeah I've recently got addicted to OS Locator. I'm prioritising the country roads since they are poorly signed anyway.

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Comment from sdoerr on 16 March 2011 at 08:56

6 more street-names resolved according to last night's update, pushing us up another 18 places to 58th. 246 names resolved in the last month - sounds pretty good, until you look at North Lanarkshire!

--
Steve Doerr

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Comment from sdoerr on 18 March 2011 at 15:03

The time-lag is a bit annoying. Changes I made Wednesday evening are not taken into account in today's version.

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