Edit Heights

In this dialog box, you will see the horizontal alignment of the barrier in the figure to the right and the vertical alignment of the barrier in the lowest figure. The scale of these figures will be adjusted to make the most out of the space. The lowest figure has profile numbers along the horizontal axis and altitude above sea level along the vertical axis. In the figure to the right, the barrier has the same orientation as in the map.

Find it here:

MOUS_ICO Menu: Noise > Barriers > EditHeights

or

MOUS_ICO Menu: Noise > Barriers > Dialog box

MOUS_ICO Select one barrier in the list

MOUS_ICO Dialog box: Edit heights

or

nco: Select one barrier (defined in Novapoint Noise)

MOUS_ICO Popup menu: Edit heights

The first time we get into this dialog box, the barrier is specified with an elevation of 0 m (altitude). There are barrier points at the start and end of the barrier together with all horizontal break points (all points on the polyline defining the centerline of the barrier). For each barrier point, there is a height calculated from the terrain model.

Help functions

• Raise/lower barrier - Raises or lowers the whole barrier. In the field to the right of this button, the change in height is entered in meters. A negative value gives a lower barrier. The button Raise/lower barrier: must be clicked after entering a value to complete the change.

• Max distance between points - Enters barrier points with a fixed internal distance. This may be relevant when constructing a barrier that is to follow the terrain. It may also be relevant to define a point for each barrier-pole, in order to get data for detailed barrier construction. The distance between the points in meters is entered in the field to the right. The button Max distance between points: must be clicked after entering a value to complete the change.

Barrier points

Basically, a barrier point is a point where the barrier has a break either in the horizontal or vertical direction. In addition, the barrier’s start and end points are defined as barrier points. The functions in this frame allow the user to change the barrier points. The profile number of a barrier point is the distance along the centerline of the barrier from its start point.

• Delete - Deletes a barrier point. If a point representing a break in the horizontal direction is deleted, the horizontal alignment of the barrier will change, and by that, the profile numbers of the barrier points subsequent to the deleted point will change.

• Profile - Shows the profile number of a barrier point. A new barrier point may be entered by specifying a new profile number in this field.

• Set all - Enters the value from the field Interpolate height for all barrier points. The first and last barrier points cannot be set to be interpolated.

• Interpolate height - By clicking this option, the height of this barrier point is interpolated from the height of the closest barrier points before and after the selected barrier point not specified as interpolated.

• Set all - Sets the value from the field Absolute height for all barrier points.

• Absolute height - The absolute height (meters above sea level) may be entered for each barrier point.

• Fetch - Recalculates terrain heights for all barrier points.

It is important that feature codes and groups etc. are correct in the terrain model before terrain heights are fetched.

• Terrain height - Height of the current barrier point, calculated from a cross-section in the terrain model.

The terrain height in a point may in theory become as much as 1 m wrong if the equidistance is one meter. On detailed design, one should therefore check the absolute heights.

• Set all - Enters the value from the field Relative height for all barrier points. Note that this does not affect the value Interpolate height. In order for the barrier to completely comply with the terrain, Interpolate height must be off for all barrier points.

• Relative height - Relative height (height above ground level) for each barrier point. Terrain heights have to be fetched before the relative heights for barrier points can be shown/used.

• Areal - Shows the area of the barrier. Calculated as the sum of the trapezoids between barrier point peaks and calculated barrier point terrain heights.

• Previous point - Moves to the previous barrier point.

• Next point - Moves to the next barrier point.

Misc.

• OK - The dialog box is closed and the barrier is changed.

• Cancel - The dialog box is closed without any changes in barrier heights.

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