On 9/21/07, <b class="gmail_sendername">Andy Robinson</b> <<a href="mailto:Andy_J_Robinson@blueyonder.co.uk">Andy_J_Robinson@blueyonder.co.uk</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
David Earl [mailto:<a href="mailto:david@frankieandshadow.com">david@frankieandshadow.com</a>] wrote:<br>>Sent: 21 September 2007 2:36 PM<br>>To: Frederik Ramm<br>>Cc: Andy Robinson; <a href="mailto:talk@openstreetmap.org">
talk@openstreetmap.org</a>; 'osm-dev'<br>>Subject: Re: [OSM-talk] [OSM-dev] FW: OSM stats quote for a paper<br>><br>>On 21/09/2007 13:51, Frederik Ramm wrote:<br>>> So if that data is to be believed, around 66 thousand kilometres of
<br>>> roads have been added in the UK and Ireland during the last 6 months.<br>>> (Reality check, anyone - is that figure probable?)<br>><br>>If anything it sounds a bit low to me. I estimate that I have personally
<br>>added around 1,000 km of roads in the year I have been mapping, and<br>>that's by bike. People who've been mapping the larger scale road network<br>>by car must have travelled substantially longer distances, even though
<br>>the time involved may be similar.<br>><br>>I estimate Cambridge has about 600km of road for a population of<br>>110,000. So does 1km ~= 200 people in populated areas?<br>><br><br>There are lost of statistics from individuals that would be useful to
<br>compare. They are also very useful for estimating how long it would take to<br>map to a particular level in a given location around the globe.<br><br>From my own experience I know that when I map urban areas systematically by
<br>bike (that is from a clean empty space with no Yahoo imagery to a "complete"<br>map), I do so at a rate of 10km per hour with a further one hour needed for<br>editing for every hour on the bike. So that equates to a potential mapping
<br>rate by bike of 5km per hour per person, or 40km / person / 8 hr day. Which<br>if I was cycling the whole of the 400,000km of UK roads would take me 10,000<br>person days (27 years without a holiday!). So you can see that it doesn't
<br>take too many mappers doing a bit of mapping each day to realise a complete<br>map of a dense urban country in a year or two.</blockquote><div><br>At State of the Map I presented some estimates that concluded it would require 17,000 man days to complete the UK (85 man years with time of at weekends and holidays etc).
<br><br>But the figures would appear to be in the right ballpark +/- 100%.<br><br>80n<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Cheers<br><br>Andy<br><br>Andy Robinson<br><a href="mailto:Andy_J_Robinson@blueyonder.co.uk">Andy_J_Robinson@blueyonder.co.uk</a><br><br><br><br>_______________________________________________<br>talk mailing list<br><a href="mailto:talk@openstreetmap.org">
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