Physical model time cannot be earlier than 1 Jan 1970 00:00:00.
If one wished to recreate scenarios prior to that date it must be done 
using some relative time (e.g. 0).


All spatial data relates to the WGS84 datum (or GDA94) and has been 
projected into UTM with false easting of 500000 and false northing of
1000000 on the southern hemisphere (0 on the northern).

It is currently assumed that all computations take place within one UTM zone. 

DEMs, meshes and boundary conditions can have different origins within 
one UTM zone. However, the computation will use that of the mesh.

The dataflow is: (See data_manager.py and from scenarios)


Simulation scenarios
--------------------


Sub directories contain scrips and derived files for each simulation.
The directory ../source_data contains large source files such as
DEMs provided externally as well as MOST tsunami simulations to be used 
as boundary conditions.

Manual steps are:
  Creation of DEMs from argcview (.asc + .prj)
  Creation of mesh from pmesh (.tsh)
  Creation of tsunami simulations from MOST (.nc)

  
Typical scripted steps are

  prepare_dem.py:  Convert asc and prj files supplied by arcview to 
		   native dem and pts formats
  
  prepare_pts.py: Convert netcdf output from MOST to an sww file suitable
		  as boundary condition
		  
  prepare_mesh.py: Merge DEM (pts) and mesh (tsh) using least squares 
                   smoothing. The outputs are tsh files with elevation data.
		   
  run_simulation.py: Use the above together with various parameters to 
		     run inundation simluation.