[OSM-dev] [OSM-talk] FW: OSM stats quote for a paper

80n 80n80n at gmail.com
Fri Sep 21 18:01:24 BST 2007

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

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).

But the figures would appear to be in the right ballpark +/- 100%.


> Andy
> Andy Robinson
> Andy_J_Robinson at blueyonder.co.uk
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> talk at openstreetmap.org
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