Add xarray.Datatree() guidance for ICESat-2 ATL06 tutorial

[asteiker]

xarray.Datatree() is now presented in our ATL06 tutorial to demonstrate the ability to open an entire ICESat-2 granule in xarray without having to specify an individual group. There is the need to specify setting phony dims due to insufficient dimension metadata in some of the ancillary groups, however. I utilized the guidance in @andypbarrett 's SMAP PR (#91) for this.

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[mikala-nsidc]

Hi @asteiker !

I'm hoping we can clarify these few sentences a bit more:

Data could be read into numpy arrays or a pandas.Dataframe. However, each granule would have to be read using a package that reads HDF5 granules such as h5py. xarray does this all under-the-hood in a single line.

Maybe something like:

Reading the data into numpy arrays or a pandas.Dataframe could be an alternative method to using xarray.Datatree(). However, each granule (file) would have to be read first using a package that reads HDF5 files such as h5py. xarray does this all under-the-hood in a single line.

[asteiker]

@mikala-nsidc Updated per your suggestion. Please approve once you are ready.

[asteiker]

@mikala-nsidc I went ahead and merged to align with the datatree article deadline but we can always iterate if you have any other suggestions!