CMIP6 Extension Specification

• Title: CMIP6
• Identifier: https://stac-extensions.github.io/cmip6/v1.0.0/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:access	array	e.g. ["HTTPServer"]
cmip6:index_node	string	e.g. null
cmip6:latest	boolean	e.g. true
cmip6:pid	string	e.g. null
cmip6:replica	boolean	e.g. false
cmip6:retracted	boolean	e.g. false
cmip6:instance_id	string	e.g. CMIP6.ScenarioMIP.UA.MCM-UA-1-0.ssp245.r1i1p1f2.Amon.psl.gn.v20190731
cmip6:citation_url	string	e.g. http://cera-www.dkrz.de/WDCC/meta/CMIP6/CMIP6.ScenarioMIP.UA.MCM-UA-1-0.ssp245.r1i1p1f2.Amon.psl.gn.v20190731.json
cmip6:variable_long_name	string	e.g. Sea Level Pressure
cmip6:variable_units	string	e.g. Pa
cmip6:cf_standard_name	string	e.g. air_pressure_at_mean_sea_level
cmip6:activity_id	string	e.g. ScenarioMIP
cmip6:data_specs_version	string	e.g. 01.00.28
cmip6:experiment_title	string	e.g. update of RCP4.5 based on SSP2
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_id	string	e.g. UA
cmip6:mip_era	string	e.g. CMIP6
cmip6:source_id	string	e.g. MCM-UA-1-0
cmip6:source_type	string	e.g. AOGCM
cmip6:experiment_id	string	e.g. ssp245
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. r1i1p1f2
cmip6:levels	string	e.g. null
cmip6:updated	string	e.g. 2024-02-20T19:28:19.804842Z
cmip6:created	string	e.g. 2024-02-20T19:28:19.804842Z

Additional Field Information

cmip6:access

...

cmip6:index_node

...

cmip6:latest

...

cmip6:pid

...

cmip6:replica

...

cmip6:retracted

...

cmip6:instance_id

...

cmip6:citation_url

...

cmip6:variable_long_name

...

cmip6:variable_units

...

cmip6:cf_standard_name

...

cmip6:activity_id

...

cmip6:data_specs_version

...

cmip6:experiment_title

...

cmip6:frequency

...

cmip6:further_info_url

...

cmip6:grid

...

cmip6:grid_label

...

cmip6:institution_id

...

cmip6:mip_era

...

cmip6:source_id

...

cmip6:source_type

...

cmip6:experiment_id

...

cmip6:sub_experiment_id

...

cmip6:nominal_resolution

...

cmip6:table_id

...

cmip6:variable_id

...

cmip6:variant_label

...

cmip6:levels

...

cmip6:updated

...

cmip6:created

...

Contributing

...

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