New to Noise Modelling: Drone Modelling and general questions

[Chowduckchow]

Hi all,

I've started using NoiseModelling in the last month or two and have found it to be a very interesting piece of software. I am intending to use the software to model the environmental noise from UAS / Drone flights. I have quite a lot of previous experience using other noise modelling (CadnaA) and GIS (QGIS and ArcMap) software so I've generally been preparing my models in QGIS alongside the NoiseModelling GUI.

However, I do have a couple of general questions questions:

1. From the online documentation, in the 'Noise Map from Point Source' tutorial, it appears that octave / third-octave band sound levels and directivity can be defined using either the field name prefix HZ (hz500) or LW (lw500). However, I don't understand if there is a difference between defining the sound level using these prefixes. Could you please confirm (see figure below)?
2. Is there any further documentation beyond what its presented in the User Guide web page (https://noisemodelling.readthedocs.io/en/latest/index.html) that discusses some of the other existing NoiseModelling blocks/tools such as the "PlotDirectivity" tool which aren't discussed in the tutorials?

With regards to modelling drone noise, my current plan is to define the flight path in QGIS and the separate the line into points. The distance between points would likely depend on the cruise speed but I'd like to start with each point being representative of 1-second of flight.

1. How would you recommend applying the time correction to the sound source? Should this be done as a -10*log(T) correction and applied to the third-octave band data or, is there another way of defining the correction such as using the "PERIOD" field?
2. Assuming the source is defined using points. What would be the simplest way to calculate the noise at a receiver from the individual sound source points? i.e. to try and create a time-history of the noise at a fixed receiver position.

As a last thing, I was reading through some of the previous discussions on this site and I noticed that @pierromond, you have already done some work on modelling drone flights, unfortunately the link doesn't work for me. "https://github.com/Ifsttar/NoiseModelling/blob/cnossos/wps_scripts/src/main/groovy/org/noise_planet/noisemodelling/wps/Experimental/Drone_Dynamic_map.groovy"). I wondered if you might be able to share this script again along with any instructions/guidance you might have if it is still available?

Any thoughts or additional information you have about the above would be much appreciated!

Thanks in advance.

Nathan

[nicolas-f]

Hi,

Sorry for the delay

1. From the online documentation, in the 'Noise Map from Point Source' tutorial, it appears that octave / third-octave band sound levels and directivity can be defined using either the field name prefix HZ (hz500) or LW (lw500). However, I don't understand if there is a difference between defining the sound level using these prefixes. Could you please confirm (see figure below)?

LWXX was the old field for NoiseModelling < 5.X

Now we are using the field HZ500 for noise level at 500Hz in dB

2. Is there any further documentation beyond what its presented in the User Guide web page (https://noisemodelling.readthedocs.io/en/latest/index.html) that discusses some of the other existing NoiseModelling blocks/tools such as the "PlotDirectivity" tool which aren't discussed in the tutorials?

The documentation of the wps block are included into the script itself and displayed in the wps builder. You can find it also in the source code ex:

https://github.com/Universite-Gustave-Eiffel/NoiseModelling/blob/v5.0.1/wps_scripts/src/main/groovy/org/noise_planet/noisemodelling/wps/NoiseModelling/PlotDirectivity.groovy#L38

1. How would you recommend applying the time correction to the sound source? Should this be done as a -10*log(T) correction and applied to the third-octave band data or, is there another way of defining the correction such as using the "PERIOD" field?

I don't understand this question, do you talk about the time delay of the propagation ?

2. Assuming the source is defined using points. What would be the simplest way to calculate the noise at a receiver from the individual sound source points? i.e. to try and create a time-history of the noise at a fixed receiver position.

You can request the attenuation/noise level for each source per receiver by enabling the option confExportSourceId on noise_level_from_source, on the RECEIVERS_LEVEL table you will have an additional column with the source identifier.

As a last thing, I was reading through some of the previous discussions on this site and I noticed that @pierromond, you have already done some work on modelling drone flights, unfortunately the link doesn't work for me. "https://github.com/Ifsttar/NoiseModelling/blob/cnossos/wps_scripts/src/main/groovy/org/noise_planet/noisemodelling/wps/Experimental/Drone_Dynamic_map.groovy"). I wondered if you might be able to share this script again along with any instructions/guidance you might have if it is still available?

I let @pierromond answer this question when he will come back

[Chowduckchow]

Hi,

Thank you for your response it is very helpful.

I can confirm that I have been able to export the noise level per source correctly.

Kind regards,

Nathan