Cross section creation

When loading a DEM new cross sections are automatically extracting eleva­tions from the DEM. By setting the checkmark ‘Use DEM for cross section creation’ specifications for the extraction can be specified.

For following options are available for cross section digitisation:

·         Use bilinear interpolation: If ‘Use bilinear interpolation’ is checked bilin­ear interpolation is used when extracting cross section z-values from the DEM cells. If unchecked the z-value in the cross section profile will be the exact value from the DEM cells that are intersected, whereas if bilin­ear interpolation is used, z-values will be the interpolated z-value from the 4 closest neighbouring DEM grid cells.

·         Use half cell size for spacing between points: The maximum spacing between points can either be user-specified or assumed as half the cell size of the DEM.

·         Maximum number of points: Should the specified maximum spacing between points result in more than the allowed maximum points the spacing is increased to obtain the maximum number of points.

When plotting existing cross sections the corresponding DEM elevations can be displayed together with the cross section by setting the checkmark ‘Show DEM together with cross section plots’. The DEM elevations can be displayed with a user-specified spacing or use the cell size of the DEM.