Add Met Office Global Deterministic height level dataset

[mo-jeff]

Description

Adding initial content for 1 of 8 collections. Things I noticed:

• Description.md is not included because it's duplicated in the template.json (?)
• There are some values that aren't for me to define as they look like internal lookup key/value pairs for Planetary Computer
• The temporal key in template.json might be tricky as this will be a 2yr rolling archive
• Assume that the item_assets doesn't need to be a static list of STAC items, as that will come from the STAC metadata we publish to you?
• Added the forecast STAC extension to the list of stac_extensions, unsure if all the others are needed.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

n/a

Checklist:

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• I have performed a self-review
• Changelog has been updated
• Documentation has been updated
• Unit tests pass locally (./scripts/test)
• Code is linted and styled (./scripts/format)

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[ghidalgo3]

Thanks @mo-jeff! Some thoughts:

• It is not strictly necessary to add a long description.md, but remember that the contents of description.md are rendered to HTML in the Planetary Computer explorer. Here you have a chance to fully describe your dataset to your users in rich detail, including links (see the red box):

• Which values? I'll eventually end up documenting them, just curious...
• A collection's temporal extent can be null on one side, which indicates an open internal. You can reference other continuously updated collections like MODIS, Sentinel2, HLS2, or GOES for an example.
• item_assets at the collection level is an indication to the users of this collection what the expected asset keys are of all STAC items assets in this collection. It should be a relatively small set of asset keys.
• You might want to consider adding the datacube STAC extension too, and documenting the dimensions of all the assets in this collection.

Let us handle the dataset.yml file, that's a workflow specification that you don't have to write.