source: anuga_work/production/hobart_2006/report/data.tex @ 4058

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. Mean Sea Level (MSL) is approximately equal to
%0m AHD with the Highest Astronomical Tide (HAT) 
%and Lowest Astronomical Tide (LAT) defined as \?m AHD
%and \?m AHD respectively for Hobart \cite{antt:06}. 

Data for this study have been supplied by the
Department of Primary Industries Water and Environment, 
who provided a
12.5m Digital Elevation Model (DEM) 
covering the South East of Tasmania. The DEM has been constructed from
10 and 20m contour lines.  

With respect to the offshore data, the Tasmanian Ports Corporation Pty Ltd (Tasports) 
provided state digital 
fairsheet data around
Hobart, in particular the Derwent River. 
This data covers a very small geographic area but high density. 
Additional data was provided from
University of Tasmania.
The Australian Hydrographic Office (AHO) has supplied extensive
fairsheet data which has also been utilised. In contrast to the onshore data, 
the offshore data is a series of survey points which is typically 
not supplied on a fixed grid. In addition, offshore data typically 
does not have the coverage of the onshore data, and often the 
offshore data will have gaps where surveys have not been conducted.
The coastline has been generated by ... 

%Figure \ref{fig:contours_compare}(a) shows the contour lines for
%HAT, MSL and LAT for the study area using the data described above.


%\begin{figure}[p]

%  \centerline{ \includegraphics[width=150mm, height=100mm]
%{../report_figures/onslow_dted_contour.jpg}}

%  \caption{Study region showing the m AHD (LAT), 0m AHD (MSL)
% and m AHD (LAT) contour lines using the AHO and Tasmanian data.}
%  \label{fig:contours}

%\end{figure}


Appendix \ref{sec:metadata} provides more details and the supporting metadata 
for this study, including images of the data extent.
Table \ref{table:data} summarises the available data. 

\begin{table}
\caption{Available data for the South East Tasmania tsunami inundation study.}
\label{table:data}
\begin{center}
\begin{tabular}{|l|l|}\hline
Data & Specifications \\ \hline 
DPIW & Onshore, 12.5m DEM  \\ \hline
UTAS & Offshore, sonar soundings  \\ \hline
Tasports  & Offshore, sonar soundings  \\ \hline
AHO & Offshore, fairsheet data for the study region \\ \hline
\end{tabular}
\end{center}
\end{table}


\pagebreak