Add instructions on downloading the DeepGlobeLandCover dataset

[robmarkcole]

Issue

The dataset docs state The dataset that we use with a custom train/test split can be downloaded from Kaggle - however this is a necessity as you cannot pass download=True

Fix

Suggest documenting the steps using kaggle CLI (below), or just to state that this must be performed? Alternatively host on Huggingface and automate the download

pip install kaggle # place api key at ~/.kaggle/kaggle.json
cd data
kaggle datasets download -d geoap96/deepglobe2018-landcover-segmentation-traindataset
unzip deepglobe2018-landcover-segmentation-traindataset.zip

[adamjstewart]

Alternatively host on Huggingface and automate the download

We haven't yet found the license for the dataset, so I'm not sure if we can do this. Want to try to reach out to the authors of the dataset to see? If the license permits redistribution, I'll add it to our Hugging Face account.

[robmarkcole]

Reading the paper, appears the imagery is from deepglobe/maxar, will check my network for contacts there

[adamjstewart]

Any updates on this?

[robmarkcole]

RE license, I came to a dead end - the people I spoke to who had worked on the dataset have all moved on

As to updating the docs, I think it could be useful if you could clarify what level of detail we should be providing?

[adamjstewart]

https://torchgeo.readthedocs.io/en/stable/api/datasets.html#torchgeo.datasets.SSL4EOS12 is an example of a similar dataset where users have to manually download it. So a similar level of detail is fine. Want to submit a PR?