Chesapeake datasets don't extract properly

[calebrob6]

The ChesapeakeMD dataset fails when attempting to extract the downloaded zip file as zipfile.ZipFile doesn't support the deflate64 compression type that _MD_STATEWIDE.zip uses.

[calebrob6]

I tested the rest of them, the following don't work for the same reason:

• ChesapeakeNY
• ChesapeakeVA

I also directly committed a fix for the Chesapeake7 dataset to main.

[adamjstewart]

I think zipfile.ZipFile does support deflate64, you just have to explicitly pass compression=zipfile.ZIP_DEFLATED. See https://docs.python.org/3/library/zipfile.html#zipfile.ZIP_DEFLATED.

I was hoping this would be done automatically. Torchvision had some logic to inject this but it wasn't clear to me how it worked. Will investigate more.

[adamjstewart]

So it turns out deflate and deflate64 are very different. The latter is a proprietary compression scheme that is not supported by zipfile. We could use https://pypi.org/project/zipfile-deflate64/, or call unzip or 7z from the command line.