Interpreting noise analysis results (Beta)
NOTE: Noise analysis is a Beta feature of Autodesk Forma
The noise analysis is based on annual average traffic counts of roads in the project, and estimates the perceived noise in decibels (dB). For a full introduction to this analysis, check out the Autodesk Forma help centre article.
In the output of the noise analysis, grid contains the decibel value at each
sample point as a Float32 value. Non-valid sample points are signaled by
NaN entries.
Code example: Noise above 60 dB
The following code example illustrates how to generate a mask of noise values larger than 60 decibel:
const noiseAnalysis = analyses
.filter(({ proposalId, status }) => proposalId === currentProposalId && status === "SUCCEEDED")
.find({ analysisType }) => analysisType === "noise");
const noiseGroundGrid = await Forma.analysis.getGroundGrid({
analysis: noiseAnalysis,
});
const N_POINTS = noiseGroundGrid.mask.length;
const aboveSixtyDecibelMask = new Float32Array(N_POINTS).fill(NaN);
for (let i = 0; i < N_POINTS; i++) {
if (!isNaN(noiseGroundGrid.grid[i])) {
if (noiseGroundGrid.grid[i] > 60) {
aboveSixtyDecibelMask[i] = 0;
} else {
aboveSixtyDecibelMask[i] = 1;
}
}
}
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