Storage Extension Specification

• Title: Storage
• Identifier: https://stac-extensions.github.io/storage/v1.0.0/schema.json
• Field Name Prefix: storage
• Scope: Item, Collection
• Extension Maturity Classification: Pilot
• Owner: @davidraleigh @matthewhanson

This document explains the Storage Extension to the SpatioTemporal Asset Catalog (STAC) specification. It allows adding details related to cloud storage access and costs to be associated with STAC Assets. This extension does not cover NFS solutions provided by PaaS cloud companies.

• Examples:
  • Item example 1: Shows the basic usage of the extension in a STAC Item.
  • Item example 2: Another example of basic usage.
• 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
storage:platform	string	The cloud provider where data is stored
storage:region	string	The region where the data is stored. Relevant to speed of access and inter region egress costs (as defined by PaaS provider)
storage:requester_pays	boolean	Is the data requester pays or is it data manager/cloud provider pays. Defaults to false
storage:tier	string	The title for the tier type (as defined by PaaS provider)

While these are all valid properties on an Item, they will typically be defined per-asset. If a field applies equally to all assets (e.g., storage:platform=AWS if all assets are on AWS), then it should be specified in Item properties.

Additional Field Information

Providers

Currently this document is arranged to support object storage users of the following PaaS solutions:

• Alibaba Cloud (Aliyun): ALIBABA
• Amazon AWS: AWS
• Microsoft Azure: AZURE
• Google Cloud Platform: GCP
• IBM Cloud: IBM
• Oracle Cloud: ORACLE
• All other PaaS solutions: OTHER

The upper-cased values are meant to be used for storage:platform.

Cloud Provider Storage Tiers

Minimum Duration	Google Cloud Platform	Amazon AWS	Microsoft Azure	IBM Cloud	Oracle Cloud	Alibaba Cloud
0 (Auto-Tier)		Intelligent-Tiering		Smart Tier
0 days	STANDARD	Standard	hot	Standard	Standard	Standard
30 days	NEARLINE	Standard-IA, One Zone-IA	cool	Vault	Infrequent Access	Infrequent Access
60 days						Archive
90 days	COLDLINE	Glacier		Cold Vault	Archive
180 days		Glacier Deep Archive	archive			Cold Archive
365 days	ARCHIVE

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