need ability to track Marine Heat Wave as polygons

[gaelforget]

We envision doing this via rasters.jl

First few steps could be :

1. take SST anomaly (SSTa) map from the Sea Surface Temperature notebook (➭ code link).
2. calculate polygon corresponding to x0<SSTa<x1 with GeometryOps.polygonize
3. plot the resulting polygon over map using GemoMakie.jl
4. create a Julia function to do the above
5. return a data structure (named HeatWave?)
6. create plot method (in extension)
7. add to CI (test/runtests.jl)

To get started :

• fork Climatology.jl, and clone your fork e.g. as shown here.
• in terminal create a branch, push to fork, and open PR (e.g. add MHW detection example (GeometryOps.polygonize) #123 ).

[gaelforget]

See Detection From Map section of the notebook for the example using GeometryOps.polygonize

[gaelforget]

To learn about Julia basics , maybe this is a good place to start :

https://github.com/AIRCentre/JuliaEO24/tree/main/notebooks/Julia_Language_Context_and_Basic_Concepts

[gaelforget]

One of the next step will involve calculating overlapping areas between one time step and the next.

Not unlike in SpeedyWeather/SpeedyWeather.jl#648

[gaelforget]

One of the next step will involve calculating overlapping areas between one time step and the next.

• Have just added a set of initial tests under Testing Polygon Ops in the notebook
• GO.difference is used to subtract one polygon from another, and calculate areas
• but have not tested the case of partial overlap yet ...

See #126 and #127

[gaelforget]

ping @asinghvi17 , @rafaqz , @evetion (project I mentioned at JuliaEO25)