rainfall_onset2 on Ghana data

WinnieWin commented 2 years ago

I attempted to use the [rainfall_onset2] with my data but encountered some difficulties. Please, I would appreciate it if you could take a look at it for me.

ogunjosam commented 2 years ago

Dear @WinnieWin ,

What type of difficulties did you encounter? Are you working with gridded data or station data? If you can share snippets of the difficulties, we can take a look at it together.

Thank you.

WinnieWin commented 2 years ago

Dear Samuel, Please find attached screenshots of the error messages I get after running the script on my data. Meanwhile I am working with gridded data please.

On Mon, 18 Apr 2022 at 10:02, Ogunjo Samuel @.***> wrote:

Dear @WinnieWin https://github.com/WinnieWin ,

What type of difficulties did you encounter? Are you working with gridded data or station data? If you can share snippets of the difficulties, we can take a look at it together.

Thank you.

— Reply to this email directly, view it on GitHub https://github.com/adrHuerta/rainfall_onset2/issues/2#issuecomment-1101279874, or unsubscribe https://github.com/notifications/unsubscribe-auth/AG7GILXLKQHIH6PAS5X5SS3VFUXKZANCNFSM5TNTPIAQ . You are receiving this because you were mentioned.Message ID: @.***>

-- Winifred Ayinpogbilla Atiah (PhD)

Department of Physics

Kwame Nkrumah University of Science and Technology(KNUST)

*Alternative E-mail: @. @.> *

Tel: +233 (0)207963493

adrHuerta commented 2 years ago

Dear @WinnieWin and @ogunjosam

Sorry for my late reply I have already checked the code and I uploaded a new one (https://github.com/adrHuerta/rainfall_onset2/blob/master/example_gh.py) using the example of @WinnieWin

Regarding the issues for both, I found the following

@WinnieWin as in your study area the rainfall season is within a year, is not needed to set the hydrological year
@ogunjosam I added a new function for getting the numeric values of the onset/cessation for each year (I add some comments in the code). It begins on 1st January for each year
Some issue that I found is that some parts of Ghana have two rainfall seasons (southern areas) - This is something that the code can not handle. So be careful with that. Look at this time series: For a grid where there is one single rainfall season For a grid where there are two rainfall seasons
Another issue is that is possible to find some bad grids where the seasonality can not be well resolved by the gridded data - If you look at the onset/cessation for each year you will notice that some values present atypical values (based on its neighboring grids). This is related to the development of the gridded datasets and can be seen as a quality control process (you can compare it with other satellite-based precipitation estimation)

Finally, I would like to mention how to handle the last two points

Remove grid areas where is possible to find two rainfall seasons
Rather than applying the onset/cessation analysis at the grid scale, it would be better to apply it at the area scale (or meteorological station scale).

Regards Adrian

WinnieWin commented 2 years ago

Thanks, I'll check it out. I really appreciate your time and effort.

On Wed, 20 Apr 2022 at 17:31, Adrian Huerta @.***> wrote:

Closed #2 https://github.com/adrHuerta/rainfall_onset2/issues/2.

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-- Winifred Ayinpogbilla Atiah (PhD)

Department of Physics

Kwame Nkrumah University of Science and Technology(KNUST)

*Alternative E-mail: @. @.> *

Tel: +233 (0)207963493

adrHuerta / rainfall_onset2

rainfall_onset2 on Ghana data #2