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Implement time filtering with xarray Rolling object. #11

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lesommer opened this issue May 6, 2016 · 3 comments
Open

Implement time filtering with xarray Rolling object. #11

lesommer opened this issue May 6, 2016 · 3 comments
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@lesommer
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lesommer commented May 6, 2016

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@lesommer lesommer changed the title Implement a Lanczos filter in time with xarray Rolling object. Implement time filtering with xarray Rolling object. May 24, 2016
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  • start with a simple boxcar rolling window for testing
  • generalize this to linear filters (inc Lanczos filter)
  • think about how to implement loess filter.

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Guillaume has started to work on this in a dedicated branch. see in particular this commit.

lesommer referenced this issue Jun 21, 2016
I have created a Window object in timefilters.py that inherits from D…
915c929 
…ataArray. I have implemented a convolution method with dask. It works for severak 1d window including the famous Boxcar and the powerful Lanczos.
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Comments on xarray.DataArray.rolling object :

  • It is only designed to work only on one dimension. This won’t suit for the 2D linear filtering for the moment.
    • It does not include the dask array by default and needs to use bottleneck , which are numpy function coded in Cython, to be efficient

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