s1_geocode_stack.py: Add ability to read "DH" SAFE files

[scottstanie]

This adds the ability to recognize SAFE files that have HH/HV instead of VV/VH.
Right now I'm raising a NotImplementedError in _get_pol_str if you try to ask for dual-pol, since I'm not sure how we're handling that elsewhere in the code and it seems like it would need some further refactoring to allow.

[seongsujeong]

Looks good overall. Couple of comments are in the below. - Seongsu

[seongsujeong]

I think it would be better to mention what values are expected for pol_type in the docstring.

[seongsujeong]

Suggested change

	if count == "S" and pol_type in ["dual-pol", "cross-pol"]:
	raise ValueError(f"{zip_file} is single-pol. Unable to process {pol_type}")
	if pol_type == "dual-pol":
	raise NotImplementedError("TODO")
	if h_or_v == "H":
	return ["hh", "hv"]
	else:
	return ["vv", "vh"]
	elif pol_type == "cross-pol":
	return 'hv' if h_or_v == "H" else "vh"
	elif pol_type == "co-pol":
	return 'hh' if h_or_v == "H" else "vv"
	else:
	raise ValueError(f"Invalid {pol_type = }")
	if pol_type not in ["dual-pol", "cross-pol", "co-pol"]:
	raise ValueError(f"Invalid {pol_type = }")
	if count == "S" and pol_type in ["dual-pol", "cross-pol"]:
	raise ValueError(f"{zip_file} is single-pol. Unable to process {pol_type}")
	if pol_type == "dual-pol":
	raise NotImplementedError("TODO")
	if h_or_v == "H":
	return ["hh", "hv"]
	else:
	return ["vv", "vh"]
	if pol_type == "cross-pol":
	return "hv" if h_or_v == "H" else "vh"
	if pol_type == "co-pol":
	return "hh" if h_or_v == "H" else "vv"

Early returns for readability

[seongsujeong]

Another thought. Currently the default pol for load_bursts() in s1-reader is fixed to vv (here). I think this functionality would be useful for the s1-reader. So, what do you think about putting this function into s1-reader @scottstanie?

[scottstanie]

Oh that's a great point. I knew there was somewhere that made more sense than tucked away in this stack script lol.