[Talk-GB] Quarterly task

[Andy Townsend]

On 03/01/2017 22:34, Rob Nickerson wrote:
> Water sounds good.

... and to me too - in fact it's what I've been doing on and off for the 
last couple of months, mainly in South Wales bordering areas that I've 
been walking where I've noticed that streams are in the wrong places.

OS OpenData StreetView is quite predictable here - it's usually correct 
except in the following (checkable) situations:

1) a mountain stream has obviously moved (which you can see from Bing 
imagery, even if the latter is offset somewhat)

2) there's been some recent man-made intervention (e.g. a fishing lake)

3) it's a ditch beside a road - the OS tends to draw these in the 
"wrong" places for cartographical purposes, but again you can align via 
Bing, even if the latter is offset, because you can align the road.

4) the OS often adds a "catographic flourish" at the upper ends of 
mountain streams which in my experience (Black Mountain / Beacons / 
south of Hay) doesn't exist.

5) Sometimes the OS has the top ends of streams and ditches extending 
further than you might think (e.g. through a boggy area). That's the 
only one of these 5 that really needs surveying to check.

Bing is often "more up to date" (you can tell be the evolution of 
wiggles in waterways), but can be offset in hilly areas even if that's 
much less of a problem elsewhere in the UK.

>
> There are 15,825 ways tagged source=NPE + waterway=* and an additional 
> 23,146 with lowercase npe. So plenty based originally on old data that 
> can be improved upon.
>
> I will set up a tag script in the next few days to track progress of 
> source=NPE/npe + waterway=*. Any other things that we should track via 
> TagInfo?

I'd leave it at that actually - anything else would just overcomplicate 
things.

Best Regards,

Andy