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Automatically assigning Building Evaluation Symbols

For a large number of buildings, the building evaluation symbols can be added automatically. This action can, if necessary, be established based on a a numerical condition or limited to a defined area in your project. First, a source and a number of houses are entered.

  • Enter a point source with an A-weighted sound power level of 100 dB(A).
  • Enter in the vicinity of the point source a building with a height of 10 m (Scale 1:1000).

Point source with building nearby

Context Menu: Duplicate Buildings

  • Click on the border of the building with the right mouse button and select the command Duplicate from the context menu.
  • On the dialog Duplicate, enter the values as shown in following figure. Upon OK, five columns and four rows of buildings are generated. The negative sign for „Vertical“ (i.e. the y-axis) causes the duplicates to be generated with 10 m gaps downwards (i.e. into negative y-direction).

Duplicating buildings

Assigning names

In the next step, a name shall be addressed to all buildings. This can be achieved easily via the object table.

  • Open the table Buildings via menu Tables|Obstacles.
  • Click into column "Name" with the right mouse button and select the command Change Column from the context menu.
  • Select for the range of rows "Whole Table", replace in the input box „Replace with“ the default entry „\1“ by the string „building ##“ and press OK. The buildings receive the name "building" followed by a two-digit numbering.
  • The action is immediately executed when pressing the OK-button.

Addressing Area of Land Use

  • Select the object "Area of Designated Use" from the toolbox and draw a polygon around the building. This enables later on to assign a limiting value to the building evaluation symbols to be defined.
  • Open the dialog Area of Designated Land Use by a double-click on its border and select the type of use „WR“ (i.e. pure residential area) from the list box „Land Use“.

Arrangement of buildings with landuse object

3D-Special view

All the building’s duplicates have the same height as the initial building. Via the key combination CTRL+3 the 3D-Special view is displayed.

Arrangement of buildings in 3D-Special view

Note

Areas of designated use are not displayed in the 3D-Special view.

  • Close the 3D-Special view.
  • Click with the right mouse button into the white area on the CadnaA-main window and select from the context menu the command Modify Objects.

Addressing building evaluations

The dialog Modify Objects assigns actions to a selection of CadnaA-objects. Detailed explanations of all actions and all further options on the dialog are in Chapter 11 - Modify Objects in this manual.

  • Select the action „Generate Building Evaluation“ and click on the object type "Building" in the lower list to specify the target object type.

  • Upon OK, the number of objects affected by this action are shown on a further dialog. The change can be confirmed for each object individually (Yes) or be rejected (No). With „All“ the action is carried out immediately for all objects found.

  • After confirmation of the change by clicking "All" the building evaluation symbols is addressed to all buildings.
  • Start the calculation by clicking the pocket calculator symbol in the symbol bar. Subsequently, the facade points and the resulting levels are shown within the building evaluation symbols.

Building Noise Map

  • Select from the Options menu the command 3D-View and on this dialog from the list box the view „Gen. Parallel“.

  • Via the arrow keys left/right on your keyboard you can rotate the buildings with the facade points attached in 3D-view.

Building Noise Map in 3D-view (Options menu)

Settings for Building Noise Map

By default, the maximum level at every facade point is evaluated and displayed. This and further settings relevant for the building noise map are available on the dialog Building Noise Map (Options menu).

  • Open the dialog Building Noise Map.
  • In the upper half, the option "Maximum" is selected as the averaging method. This means that the highest facade level of all facade points is assigned the building.
  • Change in section „Appearance of Building Noise Map“ of the dialog the option „Show Facade Points“ to „(all)“ and close the dialog with OK.

Note

Further information on the available settings on the dialog Building Noise Map see Building Noise Map in the CadnaA-reference manual.

  • Reopen the 3D-View on the Options menu (General Parallel). Now, the building noise map is displaying all facade points.

  • Close the dialog 3D-View and press the key combination CTRL+3 to enable the 3D-Special View.

On the building noise map, the facade points are represented by three ribbons for the three storeys along the building’s facade. The colors corresponds to the color palette as selected on dialog Grid Specification (Grid menu) for each evaluation parameter. The ribbons along the facades reach for each storey by definition from 0 to 2.5 m, from 2.5 to 5.3 m, and from 5.3 to 8.1 m. Since the remaining height of 1.9 m is less than required one for another storey the colors do not extend above 8.1 m.