NEX GDDP Data Extension Specification

• Title: NEX GDDP
• Identifier: https://stac-extensions.github.io/nexgddp/v1.0.0/schema.json
• Field Name Prefix: nexgddp
• Scope: Item, Collection
• Extension Maturity Classification: Proposal
• Owner: @dchandan

This document explains the provides an extension to describe the NEX GDDP data. Specifically, it describes the data stored on the Marble network.

• Examples:
  • Item example: Shows the basic usage of the extension in a STAC Item
• 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
nexgddp:license	string	REQUIRED. Data license
nexgddp:version	string	REQUIRED. Data version
nexgddp:calendar	string	REQUIRED. Calendar of the data
nexgddp:frequency	string	REQUIRED. Temporal frequency of the data
nexgddp:source_id	string	REQUIRED. Source ID of the CMIP6 model
nexgddp:Conventions	string	REQUIRED. Data CF convention
nexgddp:institution	string	REQUIRED. Name of the institution which produced the CMIP6 model
nexgddp:variable_id	string	REQUIRED. Variable ID of the CMIP6 variable
nexgddp:cmip_version	string	REQUIRED. Generation of the CMIP project
nexgddp:experiment_id	string	REQUIRED. Experiment ID of the CMIP6 experiment
nexgddp:variant_label	string	REQUIRED. String representation of the experiment variant
nexgddp:institution_id	string	REQUIRED. ID of the institution that created this model

Additional Field Information

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