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|[Accuracy](https://github.com/stac-extensions/accuracy)| accuracy | Collection, Item | Proposal | 1.0.0-beta.1 | 2023-12-18 | Fields to provide estimates of accuracy, both geometric and measurement (e.g., radiometric) accuracy. |
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|[Aerial Photography](https://github.com/linz/stac/tree/master/extensions/aerial-photo)*| aerial-photo | Collection, Item |*WIP*|*Unknown*|*Unknown*| Aerial photography related metadata, such as run, sequence number, altitude and scale. |
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|[Alternate Assets](https://github.com/stac-extensions/alternate-assets)| alternate`| Collection, Item | Pilot | 1.2.0 | 2024-07-09 | Describes alternate locations and mirrors of assets |
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|[Alternate Assets](https://github.com/stac-extensions/alternate-assets)| alternate | Collection, Item | Pilot | 1.2.0 | 2024-07-09 | Describes alternate locations and mirrors of assets |
|[Anonymized Location](https://github.com/stac-extensions/anonymized-location)| anon | Collection, Item | Pilot | 1.0.0 | 2021-04-30 | Provides a way to anonymize location data |
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|[Application](https://github.com/stac-extensions/application)| application | Assets, Item, Links |*WIP*|**Unreleased**| N/A | Describes applications (examples, workflows, ...) and links to them for execution. |
@@ -63,7 +63,7 @@ Below you can also find a list of extensions grouped by [maturity](#grouped-by-m
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|[ML AOI](https://github.com/stac-extensions/ml-aoi)| ml-aoi | Asset, Collection, Item, Links | Proposal | 0.2.0 | 2024-03-28 | An Item and Collection extension to provide labeled training data for machine learning models. |
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|[ML Model](https://github.com/stac-extensions/ml-model)| ml-model | Collection, Item | Deprecated | 1.0.0 | 2021-12-14 | An Item and Collection extension to describe machine learning (ML) models that operate on Earth observation data. |
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|[Machine Learning Model Extension](https://github.com/stac-extensions/mlm)| mlm | Asset, Collection, Item, Links | Candidate | 1.5.0 | 2025-08-23 | STAC Machine Learning Model (MLM) Extension to describe ML models, their training details, and inference runtime requirements. |
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|[Merkle Tree](https://github.com/stacchain/merkle-tree)*| merkle`| Catalog, Collection, Item | Proposal | 1.0.0 | 2024-11-05 | A STAC extension that enhances metadata integrity by encoding items, collections, and catalogs using Merkle hash trees. |
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|[Merkle Tree](https://github.com/stacchain/merkle-tree)*| merkle | Catalog, Collection, Item | Proposal | 1.0.0 | 2024-11-05 | A STAC extension that enhances metadata integrity by encoding items, collections, and catalogs using Merkle hash trees. |
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|[Military Grid Reference System](https://github.com/stac-extensions/mgrs)| mgrs | Item | Pilot | 1.0.0 | 2021-06-09 | MGRS extension that provides information about the latitude band, grid square and UTM zone. |
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|[Monty](https://github.com/IFRCGo/monty-stac-extension)*| monty | Collection, Item | Proposal | 1.0.0 | 2025-05-27 | Provide a set of new fields and data type to build a Montandon, Global Crisis Data Bank |
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|[Moving Features](https://github.com/stac-extensions/moving-features)| mf | Item |*WIP*|**Unreleased**| N/A | stac extension for moving features |
@@ -104,12 +104,12 @@ Below you can also find a list of extensions grouped by [maturity](#grouped-by-m
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|[Video](https://github.com/stac-extensions/video)| video | Collection, Item | Proposal | 1.0.0 | 2022-03-15 | Provides a way to describe video assets. |
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|[View Geometry](https://github.com/stac-extensions/view)| view | Collection, Item | Stable | 1.1.0 | 2025-08-15 | View Geometry adds metadata related to angles of sensors and other radiance angles that affect the view of resulting data. |
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|[Virtual Assets](https://github.com/stac-extensions/virtual-assets)| vrt | Collection, Item | Proposal | 1.0.0 | 2023-11-09 | Allows the description of virtual assets composed from 2 or more assets with cross references and repositioning. |
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|[Web Map Links](https://github.com/stac-extensions/web-map-links)| none, but each relat | Catalog, Collection, Item | Proposal | 1.2.0 | 2023-08-28 | Allows to provide links to web maps for visualization purposes |
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|[Web Map Links](https://github.com/stac-extensions/web-map-links)| none, | Catalog, Collection, Item | Proposal | 1.2.0 | 2023-08-28 | Allows to provide links to web maps for visualization purposes |
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|[Zarr Extension Specification](https://github.com/stac-extensions/zarr)| zarr | Asset | Proposal | 1.1.0 | 2025-09-04 | This extension helps users open Zarr assets. It includes core fields from Zarr attributes especially those required when opening Zarr stores. |
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|[link-templates](https://github.com/stac-extensions/link-templates)| - | Catalog, Collection, Item |*WIP*|**Unreleased**| N/A | A construct to provide templated links in STAC, as originally defined in OGC APIs. |
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|[xarray Assets](https://github.com/stac-extensions/xarray-assets)| xarray | Asset | Deprecated | 1.0.0 | 2021-06-30 | This extension helps users open STAC Assets with xarray. It gives a place for catalog maintainers to specify various required or recommended options. |
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