Minimal System Requirements

For the 32-bit version: Microsoft Windows XP/Vista/7/8, 1.6 GHz processor, 2 GB RAM

 

For the 64-bit version: Microsoft Windows XP/Vista/7/8 64-bit, 1.6 GHz processor, 3 GB RAM

 

Additionally, the source code for the functions based on NetworkX and LEMON are available from www.connectivitytools.org. The Python script which is the basis for the betweenness, current flow, and PageRank functions will run within Python on other platforms such as Linux or Mac OSX. Source code for the LEMON-based functions is also available, and we hope to port this to Linux at a future date.

 

The various functions differ in requirements for computational time and memory (RAM). The exact current flow BC subset function is RAM-intensive. All other functions, including approximate current flow BC, can be run on most desktop systems (i.e., with <4GB RAM). Time requirements scale rapidly from several minutes for graphs of several thousand nodes to hours for graphs with tens of thousands of nodes. If analyses are taking too long to complete, several options are available to reduce computational time:

1) use a coarser resolution for hxn and graph generation (set more hectares per hexagon),

2) decrease the proportion of nodes sampled (shortest-path BC), or

3) increase the error tolerance (current-flow BC).