The calculated run-up height and resulting inundation ashore is controlled by
the input topographic and bathymetric elevation, the
initial and boundary conditions, as well as the cell area of the computational
mesh. 
Ideally, the topographic and bathymetric data
should adequately capture all complex features
of the underlying bathymetry and topography. Any limitations
in the resolution and accuracy of the data will introduce 
errors to the inundation maps, in addition to the range of approximations
made within the model.

In this study, we used the Australian Height Datum (AHD)
as the vertical datum with Mean Sea Level (MSL) approximately equal to
0m AHD \cite{antt:06}. 

A 100m DEM for NSW has recently been built by Krishna 
Nadimpalli (in 2005 for the Catastrophic Disasters Working Group). 
NSW DLI supplied a 25m onshore DEM authorised for use within GA for
and State and Federal Government purposes. Available bathymetric data
held within GA at that time was then used to construct a seamless 100m
DEM for the NSW region (Jervis Bay to Forster). A 10m DEM was built
for Wollongong for the Catastrophic Disasters Working Group project and
a 25m DEM for Sydney was built for the Benfields project in early 2006.
These higher resolution data sets were used when available, with the remainder
of the regions supplemented with the 100m DEM.

With respect to the offshore data, newly acquired data from the recent
NSW Continental Slope Survey has been used, in addition to fairsheet data
from the Australian Hydrographic Office (AHO). As with the onshore data, 
the recent survey data has been supplemented with the 100m DEM (which was built
from available AHO data). Figure \ref{fig:nswdata} shows the available bathymetric
data with onshore data available from Jervis Bay to Forster.

% for future work, the coastline from Colin French will be used
 


\begin{figure}[p]
  \centerline{ \includegraphics[scale=0.5]{../report_figures/NSWData.jpg}}

  \caption{NSW region highlighting the available bathymetric data.}
 \label{fig:nswdata}
\end{figure}

\pagebreak

