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Vertical Grid

The object "vertical grid" enables to perform grid calculations on vertical cross sections showing the noise distribution as on a vertical projection screen. The noise distribution on a the vertical grid can be print, copied, saved or displayed in the 3D-Special view. By default, the receiver spacing of the vertical grid and the grid appearance are the same as for the horizontal grid.

Example

As an example, the former situation with a point source, a receiver, and a barrier in between is used (see chapter Grid Arithmetics).

To calculate the vertical grid proceed as follows:

  • Select the object "Vertical Grid" () from the toolbox and draw a line from two polygon points crossing the point source and the receiver.

Vertical grid made of a line from two points

  • Double-clicking the vertical grid will display its dialog.
  • By default, the vertical grid’s properties and the appearance parameters are set to "global", i.e. these are taken over from the horizontal grid. After deactivation of the respective option the settings can be changed separately for the vertical grid. If necessary alter these options.
  • Make sure that the receiver spacing is 1x1 m and that the option "Raster, Oversampling=1" is specified.
  • Click the button "Calculate". After calculation the vertical grid is displayed.

Note

When the option "Calculate, automatically“ is activated this vertical grid will be automatically recalculated when the horizontal grid is recalculated (menu Grid|Calc Grid).

  • After having clicked with the mouse once into the lower part of the dialog (grid part) the vertical grid can be zoomed in and out using the mouse wheel.
default setting vertical grid being zoomed in

By default, the height (z-extension) of the vertical grid is 20 m. This can be adjusted to the dimensions of the obstacles via the dialog Geometry of the vertical grid (button "Geometry").

3D-Special View

The vertical grid also displayed in the 3D-Special view. There, the vertical grid appears as a vertical projection screen showing the corresponding sound level distribution. To this end, press the key combination CTRL+3. You can navigate in the 3D-Special view by use of the forward and backward arrow keys and with the left button of the mouse pressed.

For further details on the navigation tools for the 3D-Special view please refer to the CadnaA-reference manual, chapter 3D-Special View.