Monthly Archives: November 2014

Helsinki Airport the Gateway to the East

The shortest route between two points on the earth is a great circle. This is a straight line on a globe, but ultimately looks like half-circle when projected.

Due to Helsinki Airports location, it is an ideal hub for East Asia travel. Starting at practically any European city and travelling to Far East Asia via Helsinki. The final route will almost be a straight line.

Helsinki Flights

Population of Scotland Mapped

An updated version can be found at: Every Person in Scotland on the Map

One random point on the map for each person within a postcode in Scotland.

Workflow:
OS Code-Point Open points.
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Voronoi polygons from the postcodes.
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Join 2011 Scottish Census postcode population counts to Voronoi polygons.
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Clip the resulting polygons to the Scottish coastline (using PostGIS for time saving).
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Intersect the lakes out of the resulting polygons.
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Random point in polygon into the postcode Voronoi polygons (minus lakes), using the census counts.
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Output:

Population of Scotland Mapped

An easier approach would have been to use the NRS supplied postcode areas for Scotland mentioned in previous posts. A better display of this data would be through a web mapping environment, which is working on my home environment but lacking hosting.

Scotland Gender Split

Based on 2011 Census data. We can see a clear majority of the population is Female.

The raw numbers are:
Population total:
5295403
Male total:
2567444
Female total:
2727959
Male total %:
48.48
Female total %:
51.52
Top 5 Male by %:
Shetland Islands – 50.77
Aberdeenshire – 49.52
Orkney Islands – 49.49
Aberdeen City – 49.42
Na h-Eileanan an Iar (Western Isles) – 49.37
Top 5 Female by %
West Dunbartonshire – 52.40
North Ayrshire – 52.37
South Ayrshire – 52.36
East Renfrewshire – 52.34
Inverclyde – 52.14

And the split by local authority:

Scotland Gender Split

X Percent of the Population of Scotland Lives Within Y Miles of Glasgow

I have often heard that X percent of the population Scotland live within Y miles of Glasgow. With the X and the Y varying between claimant.

This is a pretty easy question to answer, using the 2011 Scottish Census population results and the Census Output Area Population Weighted Centroids. Then we get the extents of Glasgow City Council from OS Boundary Line.

The results are:

Pop. Count: %
Scotland 5295403 100
Glasgow 593245 11.2
25 km 2002431 37.8
50 km 2839583 53.6
50 miles 3776701 71.3
100 km 4201860 79.3
100 miles 4483330 84.7

Pretty interesting results, especially the within 50 miles query.

To see how these boundaries look on a map:

Population buffers around Glasgow

A few caveats:
We are using the population weighted centroids, which will produce some minor inaccuracies, but is a very good generalisation.
Also we are using euclidean buffers on the British National Grid plain, so these are not geodesic buffers. The difference will likely be small at these distances.