Augmented historical maps

There is a set of old city maps of Turku (Finland) at Kapsi. As a resident, those maps are interesting in their own right, but when they are georeferenced, a whole new world of opportunities open up.

So I opened up QuantumGIS and georeferenced the maps of Turku from 1888 and 1950, and overlayed the current transportation network on the hand-drawn maps from the past. It’s nice to notice that the old main transportation pathways (bridges, roads to other cities) and landmarks are still in place and in everyday use!

City map of Turku from 1888 augmented with transportation network from 2015
City map of Turku from 1888 augmented with transportation network from 2015 (click to enlarge).

 

The city map of Turku from 1950 augmented with transportation network from 2015
The city map of Turku from 1950 augmented with transportation network from 2015 (click to enlarge)

One interesting artefact from the map of 1888.

The Turku Cathedral Bridge has carried a high load of traffic for ages – and quite frankly has been the bottleneck for the traffic across the city centrum (the bridge is the red rectangle):

The Cathedral Bridge has existed at least from 1414 as a wooden bridge, but the modern day steel bridge was first built in 1899 and was remodeled afterwards numerous times.

A new passing road and a new bridge was long needed to spread out the transit across the city centre as the city grew to the modern age. Tuomaansilta across the Aurajoki river, however, was not actualized until 1999 – exactly a century after the Cathedral Bridge got its first steeling (the Tuomaansilta is the blue rectangle).

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Vesa

Flâneuring through experiments in data, science and artsy digital things.