Can we use the data of Single Polarization Radar?

[nay-chi-18]

Hi @wolfidan,
Let me ask a question. I already installed Py-art and had run it on my machine by using your script and data. My testing was successful. But when I replace our radar data (kyaukphyu_N191710_E0933126_H0092_202311200617_EL+0008P1_S03_ppi_Z_450km_intensity.nc), pyart don't work. The system shows this error message " KeyError: 'range'. Our radar is single polarization type. My question is that can the data of single polarization radar use with Py-art?

[wolfidan]

Hi @nay-chi-18
No the fact that it is single-pol should not be an issue. What pyart reader did you use for your data? Do you know if your data is of cfradial type?

Thanks

[nay-chi-18]

Dear Danel Wolfensberger, Good day to you! Firstly, I want to express my sincere gratitude for your reply throughout this process. I used 'pyart.io.read'. I don't exactly know the answer to your second question. Let me attach my data (netCDF format). If it is not a burden for you, could you check my data? Best regards, Nay Chi Htun

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On Thu, Feb 15, 2024 at 3:12 PM Daniel Wolfensberger < ***@***.***> wrote: Hi @nay-chi-18 <https://github.com/nay-chi-18> No the fact that it is single-pol should not be an issue. What pyart reader did you use for your data? Do you know if your data is of cfradial type? Thanks — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVE2Z2TFQBI45R7RLHNXN3YTXC5PAVCNFSM6AAAAABDGF73CKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNBVGYYTAMZZGM> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[wolfidan]

Thanks you @nay-chi-18 ,
That's perfect, I will check your data and let you know,
If you don't want to publicly share your data, feel free to send it to daniel.wolfensberger@meteoswiss.ch. I will test it and then delete it.
Daniel

[wolfidan]

Hi @nay-chi-18

Thank you for the data, I could read it. I have a few constatations:

• The data you provided is already gridded (Cartesian lat/lon coordinates, instead of polar angle/range coordinates)
• The data lacks any metadata and does not follow any standard (CFRadial, ODIM or else)

Because the data is not polar the pyart.io.read reader will not work, as it is meant to be used on polar data (hence the missing "Range" in your data).

The reader for gridded CFRadial is pyart.io.read_grid, unfortunately it fails in your case because you have missing metadata, for example the keys origin_altitude, origin_latitude and origin_longitude are missing. They should indicate the coordinates of the radar. You can see the CFRadial standard here.

I must say that pyart is mostly designed to process polar data and most of its processing routines will not work on gridded data (attenuation correction, clutter filtering, KDP processing, ...). Do you also have access to the polar data of your radars? If yes please provide some to me and I will test them.

Thanks

[nay-chi-18]

Dear Sir, Good day to you! Firstly, I want to say thank you for your kind support to us. Let me send the polar data of our radars. Please find the attached files. Best regards, Nay Chi Htun kyaukphyu_z_20230514.tar.gz <https://drive.google.com/file/d/10sTv5WX8I5jEWZKnTByyvyeTVuEUry2w/view?usp=drive_web> mandalay_z_20230514.tar.gz <https://drive.google.com/file/d/1h2_4dpu7yNL3k6RpTxHojH69vQP2wZTK/view?usp=drive_web> yangon_z_20230514.tar.gz <https://drive.google.com/file/d/139Qy3DPumz9VB1IUQ7cRxyLoJa1W3DH9/view?usp=drive_web>

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On Mon, Feb 19, 2024 at 4:22 PM Daniel Wolfensberger < ***@***.***> wrote: Hi @nay-chi-18 <https://github.com/nay-chi-18> Thank you for the data, I could read it. I have a few constatations: - The data you provided is already gridded (Cartesian lat/lon coordinates, instead of polar angle/range coordinates) - The data lacks any metadata and does not follow any standard (CFRadial, ODIM or else) Because the data is not polar the pyart.io.read reader will not work, as it is meant to be used on polar data (hence the missing "Range" in your data). The reader for gridded CFRadial is pyart.io.read_grid, unfortunately it fails in your case because you have missing metadata, for example the keys origin_altitude, origin_latitude and origin_longitude are missing. They should indicate the coordinates of the radar. I must say that pyart is mostly designed to process polar data and most of its processing routines will not work on gridded data (attenuation correction, clutter filtering, KDP processing, ...). Do you also have access to the polar data of your radars? If yes please provide some to me and I will test them. Thanks — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVE2ZYJCAPHF4S4BWBJSPLYUMOE3AVCNFSM6AAAAABDGF73CKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNJSGA4DAMJRGM> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[wolfidan]

Thanks @nay-chi-18 ,

I will check your files. Unfortunately, I had to ask for permission to access them. Could you grant access to me?

[nay-chi-18]

Done.

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On Tue, Feb 20, 2024, 8:48 PM Daniel Wolfensberger ***@***.***> wrote: Thanks @nay-chi-18 <https://github.com/nay-chi-18> , I will check your files. Unfortunately, I had to ask for permission to access them. Could you grant access to me? — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVE2Z6GQAEGMB7GIN4SRVTYUSWDFAVCNFSM6AAAAABDGF73CKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNJUGMYTGMJRGE> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[wolfidan]

Thank you @nay-chi-18

The data seems to be in an unknown binary format. Can you provide information on how they are structured? Do you have a custom reader for them, in python, C or else?
Thank you

[nay-chi-18]

Dear Sir, Good day to you! Apologies, I'm unable to provide details on the data structure as I lack precise information. However, we possess experience in generating images from this data using Java and Python. Let me attach some files for your reference. Thank you so much for your time and consideration. Best regards, Nay Chi Htun

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On Wed, Feb 21, 2024 at 4:45 PM Daniel Wolfensberger < ***@***.***> wrote: Thank you @nay-chi-18 <https://github.com/nay-chi-18> The data seems to be in an unknown binary format. Can you provide information on how they are structured? Do you have a custom reader for them, in python, C or else? Thank you — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVE2Z3MKAZ25APZQAIFBTDYUXCNVAVCNFSM6AAAAABDGF73CKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNJWGMYTMMBWG4> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[wolfidan]

@nay-chi-18
Sorry I cannot see your attached files in the message

[nay-chi-18]

Dear Sir, You can find the attached file in the email. Have a nice day. Best regards, Nay Chi Htun

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On Mon, Feb 26, 2024 at 9:54 PM Daniel Wolfensberger < ***@***.***> wrote: @nay-chi-18 <https://github.com/nay-chi-18> Sorry I cannot see your attached files in the message — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFVE2Z4LO2T7VT5XOABKG4LYVSSLJAVCNFSM6AAAAABDGF73CKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNRUGQYTCNJXG4> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[wolfidan]

@nay-chi-18

No sorry, there was no attachment, please send the files directly to daniel.wolfensberger@meteoswiss.ch.

Thank you