STAC Extensions

The stac-extensions GitHub organization is a home for extensions to the SpatioTemporal Asset Catalog specification.

To learn about STAC and Extensions start with the extensions section of the core specification. It explains how extensions work, lists all the known extensions, and has instructions for how to go about ‘extending STAC’.

The stac-extensions GitHub organization is a home for many of the leading ‘community extensions’, providing a neutral home for collaboration. Many of these used to be in the core stac-spec repository, but were removed for 1.0.0 so they could evolve at their own pace, instead of having to follow the core STAC release cycle.

List of STAC Extensions

This is meant to be the definitive list of STAC Extensions, but not all of them may be part of this GitHub organization.

An asterisk (*) indicates a community extension that is hosted externally. As such is not part of the stac-extensions GitHub organization and may not follow the normal procedure or classification for STAC extensions, e.g. regarding the maturity.

Below you can also find a list of extensions grouped by maturity.

Alphabetical list

Title	Field Name Prefix	Scope	Maturity	Version	Description
Accuracy	accuracy	Collection, Item	Proposal	1.0.0-beta.1	Fields to provide estimates of accuracy, both geometric and measurement (e.g., radiometric) accuracy.
Aerial Photography*	aerial-photo	Collection, Item	WIP	Unknown	Aerial photography related metadata, such as run, sequence number, altitude and scale.
Alternate Assets	-	Asset	Pilot	1.1.0	Describes alternate locations and mirrors of assets
Altimetry	altm	Collection, Item	WIP	Unreleased	Altimetry Extension Specification
Anonymized Location	anon	Collection, Item	Pilot	1.0.0	Provides a way to anonymize location data
Archive	archive	Collection, Item	WIP	Unreleased	Archive extension that deals with cases when files are not directly accessible on their respective storage, but are part of an archive file, such as ZIP or TAR archives.
Authentication	auth	Asset, Catalog, Collection, Item, Links	Proposal	1.0.0	Adds fields to define authentication or authorization flows used to access Assets and Links behind security
CARD4L (Optical and SAR)	card4l	Item	Pilot	0.1.0	Describes how to comply to the CEOS CARD4L specifications (SAR and Optical) with STAC
CEOS-ARD	ceosard	Collection, Item	WIP	Unreleased	Describes how to comply to the CEOS-ARD specifications with STAC. Supersedes the STAC CARD4L extension.
CF	cf	Collection, Item	Proposal	0.2.0	Allows to provide the Standard Name Table based on the CF metadata convention.
Camera*	camera	Collection, Item	WIP	Unknown	Camera related metadata, such as focal length and sequence number. Especially useful for aerial imagery surveys.
Classification	classification	Collection, Item	Pilot	1.1.0	Describes categorical values and bitfields to give values in a file a certain meaning (classification).
Composite	composite	Item	WIP	Unreleased	Defines how virtual assets can be composed from existing assets in STAC
Contacts	-	Catalog, Collection, Item	Proposal	0.1.1	A list of contacts with detailed information such as address, phone numbers, emails etc.
Datacube	cube	Collection, Item	Candidate	2.2.0	Datacube related metadata to describe their dimensions and variables.
Disasters Charter*	disaster	Collection, Item	Proposal	1.0.0	Disaster Charter Extension Specification
Electro-Optical	eo	Collection, Item	Stable	1.1.0	Covers electro-optical data that represents a snapshot of the Earth. It could consist of cloud cover and multiple spectral bands, for example visible bands, infrared bands, red edge bands and panchromatic bands.
Example Links	example	Catalog, Collection, Item	Proposal	0.0.1	Allows to provide links to examples, e.g. code snippets.
File Info	file	Catalog, Collection, Item	Stable	2.1.0	Specifies file-related details such as size, data type and checksum for assets and links in STAC.
Film*	film	Collection, Item	WIP	Unknown	Film related metadata, such as roll, negative sequence and other physical attributes. Especially useful for digitised historic aerial imagery surveys.
Forecast	forecast	Collection, Item	Proposal	0.1.0	Common fields for (meteorological/weather) forecast data.
Grid	grid	Item	Pilot	1.1.0	Describes gridded data products, especially the grid code.
Hyperspectral Imagery	hsi	Collection, Item	WIP	Unreleased	Extension for Hyperspectral Imagery, to preserve the wavelength information for Items.
InSAR	insar	Item	Proposal	1.0.0	STAC extension for InSAR (Interferometric Synthetic Aperture Radar)
Item Assets Definition	-	Collection	Stable	1.0.0	Provides a way to specify details about what assets may be found in Items belonging to a Collection.
Label	label	Collection, Item	Pilot	1.0.1	Items that relate labeled AOIs with source imagery.
Landsat	landsat	Item	Stable	2.0.0	Landsat data fields
Landsat*	landsat	Unknown	Unknown	1.1.1	JSON Schema only!
Landsat ARD Tile*	landsat	Unknown	Unknown	1.0.0	JSON Schema only!
Language (I18N)	-	Catalog, Collection, Item	Proposal	1.0.0	Fields and recommendations around making multi-lingual STAC catalogs available.
ML AOI	ml-aoi	Asset, Collection, Item, Links	Proposal	0.2.0	An Item and Collection extension to provide labeled training data for machine learning models.
ML Model	ml-model	Collection, Item	Proposal	1.0.0	An Item and Collection extension to describe machine learning (ML) models that operate on Earth observation data.
Machine Learning Model Extension*	mlm	Asset, Collection, Item, Links	Deprecated	1.0.0	Deep Learning Model STAC Extension
Military Grid Reference System	mgrs	Item	Pilot	1.0.0	MGRS extension that provides information about the latitude band, grid square and UTM zone.
NOAA Geostationary Operational Environmental Satellite (GOES)	goes	Collection, Item	Pilot	1.0.0	STAC Extension for NOAA GOES (Geostationary Operational Environmental Satellite) products
NOAA MRMS QPE	noaa_mrms_qpe	Collection, Item	Pilot	1.0.0	STAC Extension for NOAA MRMS QPE (Multi-Radar Multi-Sensor Quantitative Precipitation Estimation) products
Open Science Catalog	osc	Catalog, Collection, Item	Proposal	1.0.0-rc.3	STAC Extension for the ESA Open Science Catalog
Order	order	Collection, Item	Pilot	1.1.0	Allows assets ordering management within STAC specification.
Perspective Imagery	pers	Collection, Item	Proposal	1.0.0	Describes perspective imagery collected by photogrammetric or non-photogrammetric cameras
Point Cloud	pc	Collection, Item	Pilot	1.0.0	Provides a way to describe point cloud datasets. The point clouds can come from either active or passive sensors, and data is frequently acquired using tools such as LiDAR or coincidence-matched imagery.
Processing	processing	Collection, Item	Candidate	1.1.0	Indicates from which processing chain data originates and how the data itself has been produced.
Projection	proj	Collection, Item	Stable	1.1.0	Provides a way to describe Items whose assets are in a geospatial projection.
Quality*	quality	Collection	Proposal	Unknown	Geospatial quality and accuracy of collections, such as horizontal and vertical accuracy.
Raster	raster	Collection, Item	Candidate	1.1.0	Describes raster assets at band level (one or multiple) with specific information such as data type, unit, number of bits used, nodata.
Rendering	renders	Collection, Item	Proposal	1.0.0	Provide consumers with the information required to view an asset properly (e.g. on a online map)
SAR	sar	Collection, Item	Candidate	1.0.0	Covers synthetic-aperture radar data that represents a snapshot of the earth for a single date and time.
Satellite	sat	Collection, Item	Candidate	1.0.0	Satellite related metadata for data collected from satellites.
Scanning*	scan	Collection, Item	WIP	Unknown	Scanning related metadata, such as the scan date and time. Especially useful for digitised images.
Scientific Citation	sci	Collection, Item	Stable	1.0.0	Metadata that indicate from which publication data originates and how the data itself should be cited or referenced.
Sentinel-1	s1	Item	Proposal	0.1.0	Sentinel-1 STAC Extension
Sentinel-2	s2	Item	Candidate	1.0.0	Sentinel-2 STAC Extension
Sentinel-3	s3	Item	Proposal	0.1.0	Sentinel-3 STAC Extension
Sentinel-5P	s5p	Item	Proposal	0.1.0	Sentinel-5P STAC Extension
Single File STAC	-	Collection, Item	Deprecated	Unreleased	An extension to provide a set of Collections and Items within a single file STAC.
Solar System	ssys	Catalog, Collection, Item	Proposal	1.1.0	SSYS STAC Extension Specification
Stats	stats	Catalog, Collection	Pilot	0.2.0	Describes the number of items, extensions and assets that are contained in a STAC catalog.
Stereo Imagery	stereo-img	Catalog, Collection, Item	Proposal	1.0.0	Describes (tri-)stereo imagery that consists of multiple captures, often for 3D use cases.
Storage	storage	Collection, Item	Pilot	1.0.0	Provides additional fields relating to how the asset is stored in the cloud
Table	table	Collection, Item	Pilot	1.2.0	Describes tabular data assets using a list of Column objects. Tables can be specified in Collections.
Themes	-	Catalog, Collection, Item	Proposal	1.0.0	A knowledge organization system used to classify the resource (controlled vocabularies / keywords)
Tiled Assets	tiles	Catalog, Collection, Item	WIP	Unreleased	Allows to specify numerous assets using asset templates via tile matrices and dimensions.
Time Series	ts	Collection, Item	Deprecated	Unreleased	Time Series STAC Extension Specification
Timestamps	-	Catalog, Collection, Item	Pilot	1.1.0	Allows to specify numerous additional timestamps for assets and metadata.
U.S. Fish & Wildlife Service (FWS) National Wetlands Inventory (NWI)	fws_nwi	Collection, Item	Proposal	1.0.0	Describes the U.S. Fish & Wildlife Service (FWS) National Wetlands Inventory (NWI) products
Versioning Indicators	-	Collection, Item	Candidate	1.2.0	Provides fields and link relation types to provide a version and indicate deprecation.
Video	video	Collection, Item	Proposal	1.0.0	Provides a way to describe video assets.
View Geometry	view	Collection, Item	Stable	1.0.0	View Geometry adds metadata related to angles of sensors and other radiance angles that affect the view of resulting data.
Virtual Assets	vrt	Collection, Item	Proposal	1.0.0	Allows the description of virtual assets composed from 2 or more assets with cross references and repositioning.
Web Map Links	none, but each relat	Catalog, Collection, Item	Proposal	1.2.0	Allows to provide links to web maps for visualization purposes. Currently, OGC WMTS and XYZ are supported.
trainingdml-ai-extension*	Unknown	Unknown	WIP	Unreleased	Detailed metadata for formalizing the information model of geospatial EO machine learning training data.
xarray Assets	xarray	Asset	Pilot	1.0.0	This extension helps users open STAC Assets with xarray. It gives a place for catalog maintainers to specify various required or recommended options.

• Last updated: Apr 25 2024, 01:05
• Count: 71

Grouped by maturity

Stable

• Electro-Optical

• File Info

• Item Assets Definition

• Landsat

• Projection

• Scientific Citation

• View Geometry

Candidate

• Datacube

• Processing

• Raster

• SAR

• Satellite

• Sentinel-2

• Versioning Indicators

Pilot

• Alternate Assets

• Anonymized Location

• CARD4L (Optical and SAR)

• Classification

• Grid

• Label

• Military Grid Reference System

• NOAA Geostationary Operational Environmental Satellite (GOES)

• NOAA MRMS QPE

• Order

• Point Cloud

• Stats

• Storage

• Table

• Timestamps

• xarray Assets

Proposal

• Accuracy

• Authentication

• CF

• Contacts

• Disasters Charter*

• Example Links

• Forecast

• InSAR

• Language (I18N)

• ML AOI

• ML Model

• Open Science Catalog

• Perspective Imagery

• Quality*

• Rendering

• Sentinel-1

• Sentinel-3

• Sentinel-5P

• Solar System

• Stereo Imagery

• Themes

• U.S. Fish & Wildlife Service (FWS) National Wetlands Inventory (NWI)

• Video

• Virtual Assets

• Web Map Links

WIP

• Aerial Photography*

• Altimetry

• Archive

• CEOS-ARD

• Camera*

• Composite

• Film*

• Hyperspectral Imagery

• Scanning*

• Tiled Assets

• trainingdml-ai-extension*

Deprecated

• Machine Learning Model Extension*

• Single File STAC

• Time Series

Adding a new extension

The general idea on how to extend STAC and propose new extensions is explained on the page about extensions in the stac-spec repository.

Using the stac-extensions template

Create the repository:

• Go to template repository, hit the green ‘Use this template’ button and choose ‘Create a new repository’.
• Be sure to pick the right place (‘Owner’ and ‘Repository name’) to create it. You can request (via Gitter or e-mail) to become a member of the stac-extensions organization or put the next repository under your personal account or any other organization.
• Add a concise and clear description of the extension, it will be used as a description in the list above!
• Click ‘Include all branches’ for the CI to write correctly.
• Finish this by clicking the ‘Create repository from template’ button

Write your extension:

• In the repository ‘Settings’ go to ‘Pages’ and set the ‘Source’ to ‘Deploy from a branch’ and for the ‘Branch’ select ‘gh-pages’ and ‘/ (root)’
• Update the title, identifier, field name prefix, scope, and owner. Don’t mess around with the formatting or structure as this will be used to generate the table above!
• Update the fields, select where they can be used, add documentation, etc. in the README.md
• Update the JSON Schema accordingly in schemas/schema.json
• Add examples
• Go through the files and update everything that is still named ‘template’ (the easiest way is to let an IDE/Editor search through all the files for ‘template’)
• Run the tests
• Update the changelog
• Let people discuss your extension, e.g. via Gitter
• Eventually, release the extension via GitHub Releases

You can add external/community extensions to the list above by editing the config file and creating a Pull Request for the change. All extensions hosted in the stac-extensions organization will be added automatically each night.

This site is open source. Improve this page.