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again, this is just a few of the highlights from the report which can be downloaded from the MCEER
Website. The URL is up here at
the top, or you can link to it from our homepage, imagecatinc.com.
Thank you for your time.
Can I answer any questions?
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.
You’ll notice 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
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
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
I want to first move
quickly through slides visualizing several different response functions and
then return to each. The functions I will focus on
today all have a strong connection to Ground Zero, although the activities
associated with some functions include
responsibilities beyond the World Trade Center site. The contrast in network size and shape points to the different characteristics of various
networks. Networks themselves form
different shapes and vary to the extent to which they
span the network.
Consider response functions such as emergency coordination
and logistics. Each of these functional networks spans
a large portion of the entire network. In emergency coordination, we see a
strong concentration of organizations near the center,
but notice the extent to which organizations are connected farther out. The
same is true of logistics.
Now compare the two
images from the previous slide representing emergency coordination and
logistics with debris management where the function
still covers a large portion of the system, but due to an increase in specialization is somewhat smaller than the previous two