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josephhardinee / PyDSD

Python Library for working with disdrometer data.
GNU Lesser General Public License v2.1
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'nd' data in ParsivelReader class #80

Closed sysumeteo closed 5 years ago

sysumeteo commented 5 years ago

I notice that the 'nd' data is powered by 10 in function '_readfile' of ParsivelReader class. What is the reason for that? According to the manual of Parsivel Disdropmeter ,the data following code '90' is exactly the 'nd' data, which means number of drops in 1 m**3 volumn and 1mm drop diameter spread.Am i misunderstanding anything?

josephhardinee commented 5 years ago

Sorry it took so long to respond, this message came in while I was on travel. The version of the parsivel manual I have says it is stored as log_10 of that value (Attaching the relevant screenshot here). We did verify that after the power of 10 operation the calculated rain rate, reflectivity, etc matched our expectations. The source of the screenshot above is page 29 of https://www.ott.com/download/operating-instructions-present-weather-sensor-ott-parsivel2-without-screen-heating/ .

screen shot 2019-02-19 at 6 50 12 am
josephhardinee commented 5 years ago

Sorry it took so long to respond, this message came in while I was on travel. The version of the parsivel manual I have says it is stored as log_10 of that value (Attaching the relevant screenshot here). We did verify that after the power of 10 operation the calculated rain rate, reflectivity, etc matched our expectations. The source of the screenshot above is page 29 of https://www.ott.com/download/operating-instructions-present-weather-sensor-ott-parsivel2-without-screen-heating/ .

On Thu, Feb 7, 2019 at 6:16 PM sysumeteo notifications@github.com wrote:

I notice that the 'nd' data is powered by 10 in function 'read_file' of ParsivelReader class. What is the reason for that? According to the manual of Parsivel Disdropmeter ,the data following code '90' is exactly the 'nd' data, which means number of drops in 1 m**3 volumn and 1mm drop diameter spread.Am i misunderstanding anything?

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/josephhardinee/PyDSD/issues/80, or mute the thread https://github.com/notifications/unsubscribe-auth/AAufaPNV1_hN8OR-U3mETa-lDmACUCEoks5vLN3sgaJpZM4ar54T .

-- Joseph Hardin, Ph.D. Pacific Northwest National Laboratory ARM Radar Engineering and Operations

One must do not violence to nature, nor model it in conformity to any blindly formed chimaera. -Janos Boylai

josephhardinee commented 5 years ago

Thanks for looking into the details of this by the way, it was good to go back and verify this. If you see anything else that seems amiss (or if your manual differs from mine), then let me know as we should resolve it.

sysumeteo commented 5 years ago

Thank you so much for details reply. It seems that maybe i have a wrong or out-of-date manual.