[OSM-talk] quality of drawn way

[Steve Chilton]

Does anyone have any hard facts about relative accuracies of NPE and
Landsat, or is it variable and unquantifiable?
I traced quite a few small areas of water in Lake District from NPE the
other day and was wondering whether to use the shape as per NPE but
shift each one to fit the Landsat for position. Windermere and Coniston
Water were already there and seem to fit pretty much to Landsat (may of
course have been traced from Landsat).
Any thoughts?

Cheers
STEVE

Steve Chilton, Learning Support Fellow
Learning and Technical Support Unit Manager
School of Health and Social Sciences
Middlesex University
phone/fax: 020 8411 5355
email: steve8 at mdx.ac.uk

Chair of the Society of Cartographers:
http://www.soc.org.uk/
Mind the (Map) Gap:
http://news.bbc.co.uk/1/hi/magazine/5413010.stm


-----Original Message-----
From: talk-bounces at openstreetmap.org
[mailto:talk-bounces at openstreetmap.org] On Behalf Of Nick Whitelegg
Sent: Thursday, May 10, 2007 9:22 AM
To: talk at openstreetmap.org
Subject: Re: [OSM-talk] quality of drawn way


On Thursday 10 May 2007 00:59, Alilo wrote:
> Hi,
>
> I have just made some roads using the landsat as background. Because 
> of the offset not corrected I would like to tag the road as not good 
> quality so if someone else drives through the same road in far future 
> (over 500 km road in the sahara) he could correct it.
>
> is there something like this in OSM tagging?
> - Derived from GPS : Quality=1
> - Derived from landsat : Quality=2
> - Derived from very old map Quality=3
> - VMAP Quality=4
> .....

I'd actually say that very old maps (NPE) are better quality than
Landsat. Given a choice of the two for a feature I knew still existed
(e.g. lake, 
country lane) I'd use the NPE.

Nick

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