For decades, the National Bridge Inventory
(NBI) has served as an extensive resource used by
bridge engineers and managers to study bridge
deterioration patterns and plan funding allocations
for repairs and rehabilitation. Data visualization in
the form of static graphs and charts are used often to
summarize findings. This approach may be limited
considering the fact that the NBI database is
multidimensional. In order to gain valuable
information and insight from the NBI database, there
is the need for interactive and dynamic visual data
exploration tools. This paper discusses the US Bridge
Portal (USBP), a visualization data mining web
application used to explore the NBI data. The USBP is
a data exploration tool which generates interactive
maps from the NBI database to provide an overview of
bridge conditions, attributes and needs in US states.
Using a combination of cross-filters and spatial
outputs, the dynamic maps generated have the
potential to provide a greater level of insight into the
NBI data which will lead to improved bridge
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