Network Weathermap is a perl tool that displays in a visual way the utilization of the network links of your network. The required data are acquired from graphs created by the MRTG package and are displayed as two ways colored arrows on a map representing the logical topology of the network. The resulted image is presented in a web page using extra DHTML and JavaScript code for web-over pop-ups, based on the OverLib JavaScript library.

The program is written in Perl programming language. It is using the GD perl module for opening, manipulating and writing image files. The GD module requires the Gd Graphics Library (libgd). The Gd Graphics Library requires several libraries like freetype, libjpeg, libpng and libz.