Railway network density
Using ArcInfo a fine 0.1 DM grid with a value of 1 for cells which contained
railway (a selection from the communications network) and a value of 0
otherwise was created. This grid was aggregated into 1, 2, 3, 5, 7, 11,
13 DM resolution grids with the values in each cell being the sum of cells
values in the fine grid. ArcView was then used to split the higher level
aggregations into the 1DM resolution so that all the grids contained the
same number of cells. The aggregations were then weighted and summed together
to produce the cell values mapped above.
Similarly to the motorway and dual carriageway selection from the communications
network layer this density layer highlights the densely populated areas.