- Filter data set. Format of the filter dataset; description aside.
- Weight data set (usually with extension ".wgt"); description aside. Normally, the absolute population number form the weights.
For each boundary:
number of areal unit on one side;
number of areal unit on the other side;
length of common boundary (tab delimitted). Please note: we use a serial number of the areal units and not the IDs. Borders to lakes or to polygons outside the covered region may have the same number for the to adjacent polygons.
1 2 3773.99738
1 9 2648.35318
1 12 115.0252
2 2 1345.30548
2 9 2999.51607
171 167 1613.47709
There are different ways to generate a .fil filter. Here you find a R program and a provisional documentation for a 2 step process (ArcGIS + Excel).
It has the following structure: 1st row: number of observations; 2nd to (nobs+1)th row: ID / weight of unit ID (tab delimitted).