derive a new set of coordinates from an old set of coordinates by merging or deleting items (locations)

locmod -L [-o filename] coordinate-file translation-file

locmod -a [-o filename] coordinate-file translation-file

-L

Coordinates are in longitude/latitude

-a

Coordinates are in x/y

-o filename

output file

When you use difmod to derive a new difference matrix from an old one, you can use this program to derive the corresponding new coordinate file from the old coordinate file.

To determine the coordinates for a location that was formed by joining several old locations, the programs needs to know what type of coordinates are used.

Use option -L if the coordinates are given in longitude and latitude. New coordinates are calculated by determining the centre of gravity of points on the surface of a sphere.

Use option -a if the coordinates are given in some user-defined rectangular grid. New coordinates are calculated by averaging the old coordinates.