[OSM-talk] Mapchester - continuation of work

Etienne 80n80n at gmail.com
Wed Jun 7 13:13:11 BST 2006

I did some back-of-an-envelope calculations recently about the
progress I'd been making in my area.

All these figures are very approximate, but should be in the right
order of magnitude.

Number of trackpoints uploaded = 500,000
Sampling rate = 1 point per second
Data collection time = 500,000/60/60 = 140 hours (by bicycle)

Time spent creating nodes, segments, ways etc is about 1 hour per 1
hour's worth of data collection (using JOSM).  So that's about 140
hours at the keyboard.

Area covered: Chertsey, Addlestone, Weybridge, Shepperton, Walton,
Hersham, Byfleet
Approximate population of these areas combined is 100,000.

So for suburban London something like 300 man hours per 100,000
population would seem to be a reasonable measure.

Rates would obviously be different for very densely populated areas
(more people per mile of roadway) or for sparsely populated areas
(less people per mile of roadway).

It would be interesting to compare these figures with other people's
experiences.  There's probably quite a lot of variance.


On 6/7/06, Dan Karran <dan at karran.net> wrote:
> On 6/7/06, Andy Robinson <Andy_J_Robinson at blueyonder.co.uk> wrote:
> > They (Futursonic) have purchased a Garmin GPSMap 60 CSx to gather additional
> > data in the centre of Manchester so it will be interesting to hear from them
> > how well it works in the areas that the older Garmin units had problem with
> > during the Mapchester weekend.
> It would be interesting to see a rough comparison of the amount it
> costs for an organisation to go out and map an area with their own
> equipment, contributing it to OSM, compared to the cost of licensing
> OS data for the same area. Does anyone have any sort of figures like
> that available?
> Cheers,
> Dan
> --
> Dan Karran
> dan at karran.net
> www.dankarran.com
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