Building Noise Map

The following examples refer to the dialog Building Noise Map (Options menu), section „Arithmetic, assign active Variant“.

Example 1

objective: add 2.5 dB to the results for all evaluation parameters

expression: Ld = LP + 2.5

Example 2

objective: add 2.5 dB to the results for all facade points, just for evaluation parameter 1 and keep the value of evaluation parameter 2

expressions: Ld = LP1 + 2.5, Ln = LP2

Example 3

objective: calculate level difference between variants 1 and 2

expression: Ld = LP@V1 - LP@V2

result: With variant 1 as currently selected project variant, the present result is overwritten by the level differences between variants 1 and 2 for all evaluation parameters.

Example 4

objective: calculate level difference between variants 1 and 2, just for evaluation parameter 1, and write the result for evaluation parameter 1 of the active variant into evaluation parameter 2

expressions: Ld = LPV01 - LPV02, Ln = LP1

result: With variant 1 selected the present result for evaluation parameter 1 is overwritten by the level difference between variants 1 and 2 while the facade points show the level LP1=Ld for the nighttime value (Ln).

Furthermore, the following variables can be used in expressions for the allocation of interpolated results of the horizontal receiver grid, coordinates, or the ground height at the facade points.

Variable	Explanation
r0	allocation of the results from the horizontal grid r0 to all the corresponding evaluation parameters LP1 to LP4
r01 to r04	allocation to the corresponding evaluation parameter LP1 - LP4 (r01 allocates the result to LP1, r02 to LP2 etc. - special application)
x, y, z	evaluates the corresponding x-, y- or z-coordinate of the facade point (z allocates the z-coordinate to the facade point - special application)
g	evaluates the ground height at the facade

Example 5

objective: if it is the first floor, then address the interpolated result from the grid - otherwise not, i.e. keep the existing value

expression: Ld = iif(STW==1, r0, LP)

Example 6

objective: write x-coordinate of facade point into first and y-coordinate into the second evaluation parameter

expression: Ld = x, Ln = y

Example 7

objective: write ground height at facade point into evaluation parameter 1

expression: Ld = g

Example 8

objective: write the difference level-limiting value of variant V02 at the facade point for evaluation parameters 1 and 2

expressions:

Day: LP1@V2-GW1

Night: LP2@V2-GW2