Print XLVIII

Experiments with area cartograms (Colour).

Initial results using simple techniques and machines from the authorís original programs. Based on 1981 population and voting distributions of 64 counties and 633 constituencies.

The uppermost picture was produced by a cellular algorithm on an Acorn Electron microcomputer that was thirty times less powerful than the Archimedes used to produce the images here. County boundaries were automatically manipulated on a five kilometre grid, the finished cartogram is grown within the fixed coastline of Britain and is completely continuous.

The circular algorithm was not written overnight, but developed over several years from the cellular solution. Notice how London is split in two as bridges and tunnels spanning the Thames were not included in the contiguity matrix used. At this point the results of experiments with various methods of annotating and colouring can also be seen.