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Point-like Objects

The geometry of point objects (such as point source, receiver etc.) is specified by the coordinates x, y, and the (absolute) height z. These values ​​are listed on the respective columns of the corresponding object table (see Object Tables).

Note

For the object „Cylinder“ there are, besides the x and y coordinates, the cylinder‘s center and its radius.

Note

For height points the entered height (z) is always interpreted as absolute height.

Dialog Point-Geometry with point objects

Dialog Options Point Geometry

On the dialog Point Geometry the height h (m) can be entered relative, absolute or relative to a building‘s roof. From the height h and the ground height the absolute height z results.

Options for Height

  • Option „relative“: height (m) at the coordinate point (x, y) above ground level. The (absolute) level of the ground results:
    • from terrain forming objects (contour lines, height points, lines of fault)
    • from the standard height as specified on the „DTM“ tab (menu Calculation|Configuration, see DTM Digital Terrain Model Tab) and
    • from the method used for generation of the terrain between the height defining objects (by triangulation per default).
  • Option „absolute“: height above a reference plane, usually above mean sea level (MSL). The reference height MSL might not the same to different, even neighboring countries because different definitions and references are in use.
  • Option „Roof“: In order to facilitate the height specification of sources on top of roofs of buildings a relative height above roof level can be entered using this option. When the source is within a building‘s outline the final height results from the sum (building height + height above roof).

Ground Height (m) &list box

The input box „Ground Height“ is just available with the option „Input of Value (m)“ selected.

  • Calculate from DTM (default): With this option, the ground height is calculated by evaluating the present terrain model.
  • Use next building: With this option, the ground height of the nearest building facade within radius of 1.5 m is used. With no building facade be located within this radius the height at this location is also calculated by evaluating the present terrain model.
  • Input of Value (m): The ground height at this location can be specified by entering a value.

Geometry Options for Object „Building Evaluation“

Besides the coordinates X and Y (m) the diameter (m) of the building evaluation symbol can be specified.

Note

The diameter of all building evaluation symbols in a project can be changed via the respective table (see Tables menu, Other Objects| Building Evaluation).

Dialog Geometry of the Building Evaluation Symbol

Option „Use different Calculation Point“

This option enables to place a building evaluation symbol outside of the building‘s outline. When this option is activated the building evaluation symbol can be placed outside of the building without losing the link to this building. The original coordinates are saved as well.

Procedure:

  • First place the building evaluation symbol inside of a building‘s outline.
  • Open the dialog Geometry and activate the option „Use different Calculation Point“.
  • Close all dialogs with OK and move the building evaluation symbol outside of the building‘s outline. The calculation point is indicated by a auxiliary polygon.