|We begin by viewing
the entire network representing the interactions of 529 organizations.
Organizations are represented by circles while the functions serving as the
basis for their interaction (such as logistics, debris management, and search
& rescue) are represented by different colored lines. Even at first
glance, we can see how this provides a great way to visualize the network.
organizations at the center of the network that are involved a large number
of functions, each having multiple colored lines connecting them to other
organizations, while others are only bounded to the network by interaction in
one response function area.
|The organizations in
the center with multiple connections across many relationships are said to
have a high “Degree Centrality” that is to say these organizations, again
represented by circles, are at the center of a web of other nodes and
therefore the center of the system. These central organizations represent the
nodes with the most influence over the network due to their ability to
connect otherwise isolated organizations and functions as well as an ability
to broker relationships between others.
|The next level out
you will see other organizations connected to these central organizations on
one side and another another group of organizations that are important to the
network on the other. These
organizations are said to have a high degree of “between ness centrality” due
to the fact that they are those that most often sit on the geodesic (or
shortest) path connecting two organizations.
In other words, they connect organizations that otherwise would not be
connected to the network by providing a path tat would not otherwise exist or
a shortened path between two
|What else? You
should note that the placement of the nodes/ organizations throughout this
presentation is not meaningless. The
distances between the nodes and the lengths of the line are controlled by
algorithms in a process known as multi-dimensional scaling. In this process the program pushes
organizations less bounded the network to the outer rim while centering
organizations with many ties.