This plugin creates generalized proximity matrices (GPM) file, given a network connection as road or river.The Generalized Proximity Matrix (GPM) is an extension of the usual definition of the spatial relations and includes a combination of neighborhood measures in the absolute space and in the relative space.
Dialog box screenshot:
The source code is available in: download.
To install the plugin, just unzip the DLL file in the “plugins” directory of TerraView.