After lots of trouble with other vis (we will see), i thought it would be nice to have something like james cheshire's famous population lines
https://jcheshire.com/featured-maps/population-lines-how-and-why-i-created-it/
...then ended up with something like this:
before we start, a quick note about census geographies
OA | LSOA | MSOA | |
---|---|---|---|
100-625 | 1,000-3,000 | 5,000-15,000 | people |
40-250 | 400-1,200 | 2,000-6,000 | households |
brighton example: https://ocsi.uk/2019/03/18/lsoas-leps-and-lookups-a-beginners-guide-to-statistical-geographies/
in 2011 islington was the most population dense borough
in 2021 the most population dense borough is tower hamlets
a few of the OAs, despite OAs having roughly the same number of people (about 300), have really high population density
...and the legend is less useful now.
building footprints via https://osmnx.readthedocs.io/en/stable/internals-reference.html#osmnx-features-module
...aha, look right in the centre, there's something going on in Limehouse!
https://cran.r-project.org/web/packages/cartogram/readme/README.html
...it shows that outlier loud and proud!
https://www.datawrapper.de/_/VPYgl/
this is what's known to the ONS as a "corner case" - some corners (or holes) in the 2011 OAs have been cut to fit OAs to size thresholds in 2021 - so sometimes they end up with just one building for example...
...the OA dataset has a few outliers - the pointed datavis was a good way to make this salient (instead of choropleth or cartogram)
the limitations of the technique become apparent when the mountains obscure each other, the solution is to use rotation!
https://github.com/cydalytics/HK_Properties_Price_Distribution
the OA intersecting chelsea cloisters has a population density of 2,000,000 pop/km^2
(the highest in the country as it turns out).
apperently the LSOA population density holds remains plausible throughout (the densest LSOA is in Croydon: 116,000 pop/km^2
), but there are a few "corner case" outliers in the OA dataset, this being the most extreme.
https://www.ons.gov.uk/visualisations/censuspopulationchange/E09000020/
... also see https://www.ons.gov.uk/visualisations/dvc1371/#/E09000020
...it didn't change; though the neighbour did
there's a nice primordial forest here that was almost concreted over in 1994 - you can still make out what would have been a motorway route along the less populated eastern hills and marshes, although the transport minister did compulsorily purchase many homes too https://www.roads.org.uk/ringways/ringway2 (cheers openstreetmap contributors)
data mountains of southwark. i really like this one as it shows the graduation of people from the riverside metropolis south toward the last vestiges of the great north wood. (cheers openstreetmap contributors)