Noise Modellerindicative screening · ISO 9613-2 simplified · dB(A)

Drag onto the page

Point sourceLp @ distance or Lw

Area sourceLw, Lw″ or Lp @ distance

Block sourceBuilding / enclosure

ScreenBarrier / noise wall

BuildingPassive – screens only

ReceptorLive dB(A) + distance lines

Drag a tile onto the page, or just tap it to drop it in the middle of the view.

Plot plan (optional)

To scale it: press Set scale, tap both ends of a known dimension on the drawing, then type the real length. On a computer you can also drop an image file onto the page.

Propagation

Atmospheric absorption

dB/km

Ground factor G

0–1

G = 0 hard ground, 1 porous ground (ISO 9613-2 alternative A-weighted ground term).

Apply screening

Screening frequency

Screens and buildings use ISO 9613-2 (1996) edge diffraction at this one frequency, because sources are entered as a single A-weighted value. 500 Hz is a typical choice. Switch screening off to see its effect.

Contours

Show contours

Grid height

Lowest level

Highest level

Interval

Opacity

Resolution

Background grid

Distance lines

Slice m

Angle° Lengthm Heightm Show slice