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<p class=MsoNormal><span style='color:#1F497D'>The Clacton pay scale area will
be affected by the straight line used to complete the area, rather than the use
of the coastline. This excludes almost all the urban areas that should be
included.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Ed<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> talk-gb-bounces@openstreetmap.org
[mailto:talk-gb-bounces@openstreetmap.org] <b>On Behalf Of </b>Peter Reed<br>
<b>Sent:</b> 19 February 2010 09:49<br>
<b>To:</b> talk-gb@openstreetmap.org<br>
<b>Subject:</b> [Talk-GB] Road density in Naptan pay scale areas<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It occurred to me that the "Pay scale areas" that arrived
with the OSM Naptan import should be fairly thickly populated areas, so those
with a relatively low road density would highlight places where there were
roads missing from the map, and hence help to prioritise attention on plugging
the gaps.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So for each Naptan area, I calculated road density as the
length of roads in km, divided by the area of the pay scale area in sq. km.
I've included motorways (and links), primary, secondary, tertiary, unclassiifed
and residential roads. I've not included cycleways, paths and bridleways,
etc. The database extract I used is a few weeks old (end Dec 2009), but
that shouldn't make a lot of difference (unless someone has added a mass of new
roads in a particular area).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The result can be seen here. <a
href="http://www.reedhome.org.uk/Documents/osmembedscale.html?kml=KML/naptan.kml&title=Naptan">http://www.reedhome.org.uk/Documents/osmembedscale.html?kml=KML/naptan.kml&title=Naptan</a>
.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The highest quartile of areas (by road density) are shown in
blue, then the following quartiles in green, orange and red. In other words red
areas have the least road for the area, blue areas have the most, green areas
are higher than average, orange lower than average.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Looking at the result, the broad pattern is what you would
expect, with the south-east of England fairly well covered and gaps further
north. But at a detailed level things are not as simple as I had hoped. There
is too much variation between the different Naptan areas to make sensible
comparisons. Anyway, for what it's worth, this is what it looks like. Maybe
someone else will spot a way of making use of the information.<o:p></o:p></p>
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