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| # Collection Assets Extension Specification | ||
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| - **Title: Collection Assets** | ||
| - **Identifier: collection-assets** | ||
| - **Field Name Prefix: -** | ||
| - **Scope: Collection** | ||
| - **Extension [Maturity Classification](../README.md#extension-maturity): Proposal** | ||
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| A Collection extension to provide a way to specify assets available on the collection-level. | ||
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| - [Example](examples/example-esm.json) | ||
| - [JSON Schema](json-schema/schema.json) | ||
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| ... | ||
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| ## Collection fields | ||
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| This extension introduces a single new field, `assets` at the top level of a collection. | ||
| An Asset Object defined at the Collection level is the same as the [Asset Object in Items](../../item-spec/item-spec.md#asset-object). | ||
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| Collection-level assets MUST NOT list any files also available in items. | ||
| If possible, item-level assets are always the preferable way to expose assets. | ||
| To list what assets are available in items see the [Item Assets Definition Extension](../item-assets/README.md). | ||
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| Collection-level assets can be useful in some scenarios, for example: | ||
| 1. Exposing additional data that applies collection-wide and you don't want to expose it in each Item. This can be collection-level metadata or a thumbnail for visualization purposes. | ||
| 2. Individual items can't properly be distinguished for some data structures, e.g. [Zarr](https://zarr.readthedocs.io/) as it's a data structure not contained in single files. | ||
| 3. Exposing assets for "[Standalone Collections](https://github.com/radiantearth/stac-spec/blob/master/collection-spec/collection-spec.md#standalone-collections)". | ||
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| | Field Name | Type | Description | | ||
| | ---------- | ---------------------------------------------------------------------- | ----------- | | ||
| | assets | Map<string, [Asset Object](../../item-spec/item-spec.md#asset-object)> | **REQUIRED.** Dictionary of asset objects that can be downloaded, each with a unique key. | | ||
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| **assets**: In general, the keys don't have any meaning and are considered to be non-descriptive unique identifiers. | ||
| Providers may assign any meaning to the keys for their respective use cases, but must not expect that clients understand them. | ||
| To communicate the purpose of an asset better use the `roles` field in the [Asset Object](../../item-spec/item-spec.md#asset-object). | ||
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| ## Implementations | ||
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| - The [ESM collection spec](https://github.com/NCAR/esm-collection-spec) uses this extension to expose Zarr archives. |
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| { | ||
| "stac_version": "0.9.0", | ||
| "stac_extensions": [ | ||
| "collection-assets", | ||
| "https://github.com/NCAR/esm-collection-spec/tree/v0.2.0/schema.json" | ||
| ], | ||
| "id": "pangeo-cmip6", | ||
| "title": "Google CMIP6", | ||
| "description": "This is an ESM collection for CMIP6 Zarr data residing in Pangeo's Google Storage.", | ||
| "extent": { | ||
| "spatial": { | ||
| "bbox": [[-180, -90, 180, 90]] | ||
| }, | ||
| "temporal": { | ||
| "interval": [["1850-01-15T12:00:00Z", "2014-12-15T12:00:00Z"]] | ||
| } | ||
| }, | ||
| "providers": [ | ||
| { | ||
| "name": " World Climate Research Programme", | ||
| "roles": ["producer","licensor"], | ||
| "url": "https://www.wcrp-climate.org/wgcm-cmip/wgcm-cmip6" | ||
| }, | ||
| { | ||
| "name": "The Pangeo Project", | ||
| "roles": ["processor"], | ||
| "url": "https://console.cloud.google.com/pangeo.io" | ||
| }, | ||
| { | ||
| "name": "Google", | ||
| "roles": ["host"], | ||
| "url": "https://console.cloud.google.com/marketplace/details/noaa-public/cmip6" | ||
| } | ||
| ], | ||
| "license": "proprietary", | ||
| "links": [ | ||
| { | ||
| "href": "https://pcmdi.llnl.gov/CMIP6/TermsOfUse/TermsOfUse6-1.html", | ||
| "type": "text/html", | ||
| "rel": "license", | ||
| "title": "CMIP6: Terms of Use" | ||
| } | ||
| ], | ||
| "assets": { | ||
| "thumbnail": { | ||
| "href": "logo.png", | ||
| "title": "A preview image for visualization.", | ||
| "type": "image/png", | ||
| "roles": ["thumbnail"] | ||
| }, | ||
| "catalog": { | ||
| "href": "sample-pangeo-cmip6-zarr-stores.csv", | ||
| "title": "Catalog", | ||
| "description": "Path to a the CSV file with the catalog contents.", | ||
| "type": "text/csv", | ||
| "roles": ["esm-catalog"], | ||
| "esm:column_name": "path" | ||
| }, | ||
| "activity_id": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_activity_id.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "activity_id" | ||
| }, | ||
| "source_id": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_source_id.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "source_id" | ||
| }, | ||
| "institution_id": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_institution_id.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "institution_id" | ||
| }, | ||
| "experiment_id": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_experiment_id.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "experiment_id" | ||
| }, | ||
| "table_id": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_table_id.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "table_id" | ||
| }, | ||
| "grid_label": { | ||
| "href": "https://raw.githubusercontent.com/WCRP-CMIP/CMIP6_CVs/master/CMIP6_grid_label.json", | ||
| "type": "application/json", | ||
| "roles": ["esm-vocabulary"], | ||
| "esm:column_name": "grid_label" | ||
| } | ||
| }, | ||
| "esm:attributes": ["activity_id", "source_id", "institution_id", "experiment_id", "member_id", "table_id", "variable_id", "grid_label"] | ||
| } |
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| { | ||
| "$schema": "http://json-schema.org/draft-07/schema#", | ||
| "$id": "schema.json#", | ||
| "title": "Collection Assets Extension Specification", | ||
| "description": "STAC Collection-level assets Extension to a STAC Collection", | ||
| "allOf": [ | ||
| { | ||
| "$ref": "../../../collection-spec/json-schema/collection.json" | ||
| }, | ||
| { | ||
| "type": "object", | ||
| "required": [ | ||
| "assets" | ||
| ], | ||
| "properties": { | ||
| "assets": { | ||
| "$ref": "../../../item-spec/json-schema/item.json#/definitions/assets" | ||
| } | ||
| } | ||
| } | ||
| ] | ||
| } |
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