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actris-cloudnet / cloudnetpy

Python package for Cloudnet data processing
MIT License
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PollyXT near-range SNR in calibrated PollyXT files #38

Closed griesche closed 8 months ago

griesche commented 2 years ago

Hi, it would be great to store also the SNR data from the PollyXT near-range channel in the calibrated files. In the Matlab Version of Cloudnet, this was already implemented.

Yet, so far the near-range SNR is not stored in the PollyNet-Processing-chain files (which are the files cloudnetpy uses as an input to convert the Polly data). However, I have already initiated the storage of the near-range SNR in the PollyNet-Processing-chain.

tukiains commented 2 years ago

Yes we can definitely store this if and when it comes available.

swr99ejo commented 2 years ago

Great! We plan to calculate the pixel-level uncertainties (random and bias) in attenuated backscatter coefficient (and depolarisation ratio) for each lidar/ceilometer in the next operational version - at the moment, these are just scalar values. Obviously, we would need at least SNR to do this, or be able to generate pseudo-SNR for ceilometers.

What other information do we need for the PollyXT systems? Deadcount corrections? Or would you prefer to calculate these uncertainties yourselves and include these in the calibrated files?

griesche commented 2 years ago

The pollynet processing chain now stores also the near-range data in its files. It would be good if the backscatter, SNR, and depolarization of the available wavelengths would be saved in the calibrated files. Together with the respective calibration factors.

Not sure about the deadtime correction. I think it is usually applied in the pollynet processing.

tukiains commented 2 years ago

Thanks for the info! We will take a look at this.

siiptuo commented 1 year ago

Do you know if the near-range data is currently submitted to Cloudnet and how is it stored in the files?

tukiains commented 8 months ago

Please re-open this if becomes relevant again.