CMIP6 Extension Specification

• Title: CMIP6
• Identifier: https://stac-extensions.github.io/cmip6/v2.0.0/schema.json
• Field Name Prefix: cmip6
• Scope: Item
• Extension Maturity Classification: Proposal
• Owner: @nmassey001 @rhys.r.evans3

This document explains the CMIP6 Extension to the SpatioTemporal Asset Catalog (STAC) specification.

This extension specifies a set of properties for the Coupled Model Intercomparison Project Phase 6 (CMIP6) prefixed with cmip6.

• Examples:
  • Item: CMIP6
• JSON Schema
• Changelog

Fields

The fields in the table below can be used in these parts of STAC documents:

• Catalogs
• Collections
• Item Properties (incl. Summaries in Collections)
• Assets (for both Collections and Items, incl. Item Asset Definitions in Collections)
• Links

Field Name	Type	Description
cmip6:activity_id	string	e.g. ScenarioMIP
cmip6:data_specs_version	string	e.g. 01.00.28
cmip6:frequency	string	e.g. mon
cmip6:further_info_url	string	e.g. https://furtherinfo.es-doc.org/CMIP6.UA.MCM-UA-1-0.ssp245.none.r1i1p1f2
cmip6:grid	string	e.g. lat-lon
cmip6:grid_label	string	e.g. gn
cmip6:institution	string	e.g.
cmip6:institution_id	string	e.g. UA
cmip6:mip_era	string	e.g. CMIP6
cmip6:source	string	e.g.
cmip6:source_id	string	e.g. MCM-UA-1-0
cmip6:source_type	string	e.g. AOGCM
cmip6:experiment	string	e.g.
cmip6:experiment_id	string	e.g. ssp245
cmip6:sub_experiment	string	e.g.
cmip6:sub_experiment_id	string	e.g. none
cmip6:nominal_resolution	string	e.g. 250 km
cmip6:table_id	string	e.g. Amon
cmip6:variable_id	string	e.g. psl
cmip6:variant_label	string	e.g.
cmip6:Conventions	string	e.g.
cmip6:creation_date	string	e.g.
cmip6:forcing_index	integer	e.g.
cmip6:initialization_index	integer	e.g.
cmip6:license	string	e.g.
cmip6:physics_index	integer	e.g.
cmip6:realization_index	integer	e.g.
cmip6:product	string	e.g.
cmip6:realm	string	e.g.
cmip6:tracking_id	string	e.g.

All contributions are subject to the STAC Specification Code of Conduct. For contributions, please follow the STAC specification contributing guide Instructions for running tests are copied here for convenience.

Running tests

The same checks that run as checks on PR's are part of the repository and can be run locally to verify that changes are valid. To run tests locally, you'll need npm, which is a standard part of any node.js installation.

First you'll need to install everything with npm once. Just navigate to the root of this repository and on your command line run:

npm install

Then to check markdown formatting and test the examples against the JSON schema, you can run:

npm test

This will spit out the same texts that you see online, and you can then go and fix your markdown or examples.

If the tests reveal formatting problems with the examples, you can fix them with:

npm run format-examples