Topography

Topography
dialogue Type:	Stationary Real Data
EUM Data Units	Elevation

In MIKE SHE, the topography defines the upper boundary of the model. The topography is used as the top elevation of both the UZ model and the SZ model. The topography the defines the drainage surface for overland flow.

Many of the elevation parameters can be defined relative to the topography, such as

• Lower Level,
• Upper Level,
• Initial Potential Head, and
• Drain Level.

Depth parameters, such as ET Surface Depth, are also measured from the topography.

Topography is typically defined from a DEM, defined from either a point theme shape file, or an ASCII file. If you have an ArcGIS Grid DEM, this can be converted to a dfs2 file using the MIKE Zero Toolbox. Surfer Grid files can be saved as an ASCII xyz files and then interpolated in MIKE SHE.

Non-dfs2 files or dfs2 files that have a different grid definition than the model grid are all interpolated to the grid defined in the Model Domain and Grid.

The bilinear interpolation method is useful for interpolating previously gridded DEM data. Whereas, the triangularisation method is useful for contour data digitized from a DEM.

Related Items

• Interpolation Methods