OpenStreetMap

Hello Harlow

Posted by Steve Chilton on 15 April 2010 in English (English)

Scratched an itch that has been bothering me for ages. Tried using OS_OpenData_StreetView as source for naming Y! traced streets in Harlow, Essex. This is nearest place to me that has been in serious need of map love, and I have previously gibbed at going there mapping (or organising a map party there), mostly because it is none too inspiring. Apart from the fact that not all the streets are named in StreetView it worked reasonably. Using Potlatch (as you do) meant that the names were actually obscured by the OSM detail, so I ended up having 2 browsers open, one to edit and one to see street names (using http://os.openstreetmap.org/). Whilst there I noted some largish wooded areas on OS. If the Yahoo imagery also showed the woods I traced from there, as I feel it is better source, then took name from OS, all tagged with source= or source:name= OS_OpenData_StreetView. Harlow now looks a lot better. Someone needs to go and do the fine-tuning, adding names of smaller roads, adding POIs etc, but a useful test of viability of OS as source when somewhere is already partially mapped. Have had a look at using it also to map the Thames in Berkshire where it needs waterway=riverbank tagging to give reasonable shape as the river is both wide and variable there.

Comment from Wynndale on 15 April 2010 at 22:25

I’ve been trying adding some names from StreetView too. I’ve been trying to work on areas I can (eventually) survey myself to fill in the holes; this includes a bit of Manchester (I live in London) that I will be visiting.

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Comment from c2r on 15 April 2010 at 22:33

Well played... I've spent a couple of days mapping Stortford, though collected the streetnames the old fashioned way.... It's worth remembering that what open street view data doesn't do is provide all the estate alleyways which can only be mapped by surveys/gps.....

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Comment from swing on 16 April 2010 at 09:13

If you press Caps Lock whilst in Potlatch, it fades the OSM data allowing better reading of the StreetView information.

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Comment from randomjunk on 16 April 2010 at 14:10

Or if your OS doesn't allow caps-lock for that purpose then D (for Dim apparently) also works.

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Comment from Wynndale on 17 April 2010 at 10:19

StreetView does show the back alleys in terraced houses in Manchester… just which of them have been closed off with gates.

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Comment from Wynndale on 17 April 2010 at 10:20

StreetView does show the back alleys in terraced houses in Manchester… but not which of them have been closed off with gates. (How can I edit my replies?)

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Comment from Steeplejack on 18 April 2010 at 23:56

Tracing from proprietary maps provides a starting point, but isn't it frowned upon? All through OSM Wiki they keep saying "Don't copy from other maps". So if I were you, I'd go out with the unit and walk those woodland boundaries and correct them in OSM.

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Comment from Steve Chilton on 25 April 2010 at 21:40

c2r - yep know about estate completeness, as I say one for a local. I also found this the case mapping in Witham at weekend. It gets quite boring going on your bike down all the little extension bits, and footways, in estates.
swing/randomjunk - thanks fro the tip
Steeplejack - the "don't copy" is really directed at in-copyright maps. StreetView is available out of copyright, issue is really accuracy/currency. Advice is best done with supplementary local knowledge

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