>>>> how does one go about a longitudinal study. I know that
>> seems obvious, but it would probably includes things that I
>> wouldn't have thought of.
>>>
>>> Just a fancy way of saying that you go back to the same
>> location repeatedly on a schedule.
>>>
>>> Is there more to it than that, to allow comparison of
>> recordings? E.g. Recording of the exact location and the
>> weather, setting up facing the same way at the same height,
>> using the same equipment at the same settings, etc.
>>
>> That would be nice, but I don't think it's possible to match
>> the weather!
>
> I meant noting the humidity, temperature, wind speed and direction, etc. I
> noticed that some people here do that, so I assume it's for a reason.
Yes, noting the conditions of the observation is good science.
>>> I saw a mention of calibration.
>>
>> Level calibration is good but not necessary if the value of
>> the study is in counting the species present. I do calibrate
>> my systems so if it was desired to compare the SPLs of
>> overflying aircraft, for example, that would be possible.
>
> Would you need to know the weather parameters I mentioned to do that
> accurately? I don't know how much difference it makes.
Temperature, wind, and humidity do affect the transmission of sound over
distances. I don't think they would change the SPL calibration of a mic
seriously, but they will change how the sources sound when the sounds get to
the mic.
-Dan
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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