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2 changes: 1 addition & 1 deletion extensions/sat/README.md
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**Extension [Maturity Classification](../README.md#extension-maturity): Proposal**

This document explains the fields of the Satellite Extension to a STAC Item. Sat adds metadata related to a satellite that carries an instrument for collecting data. It will often be combined with other extensions that describe the actual data, such as the `eo`, `os` or `sar` extensions. In many instances, satellite data will share common properties about the spacecraft across all of the Items. It is not necessary, but recommended to place common fields in [STAC Collections](../../collection-spec/collection-spec.md) using the [Commons extension](../commons/).
This document explains the fields of the Satellite Extension to a STAC Item. Sat adds metadata related to a satellite that carries an instrument for collecting data. It will often be combined with other extensions that describe the actual data, such as the `eo`, `os` or `sar` extensions.

The Satellite extension requires the [Instrument Fields](../../item-spec/common-metadata.md#instrument).

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3 changes: 1 addition & 2 deletions extensions/scientific/README.md
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This extension applies to STAC Items and STAC Collections.
As these scientific information are often closely bound to the collection level and therefore are shared across all items,
it is recommended to use the [Commons extension](../commons/README.md) to add the fields to a corresponding
[STAC Collection](../../collection-spec/README.md).
it is recommended adding the fields to the corresponding [STAC Collection](../../collection-spec/README.md).

- Examples: [Collection](examples/collection.json), [Item](examples/item.json)
- [JSON Schema](json-schema/schema.json)
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2 changes: 1 addition & 1 deletion extensions/view/README.md
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**Extension [Maturity Classification](../README.md#extension-maturity): Proposal**

This document explains the fields of the View Geometry Extension to a STAC Item. View Geometry adds metadata related to angles of sensors and other radiance angles that affect the view of resulting data. It will often be combined with other extensions that describe the actual data, such as the `eo`, `sat` or `sar` extensions. It is not necessary, but recommended to place common fields in [STAC Collections](../../collection-spec/collection-spec.md) using the [Commons extension](../commons/).
This document explains the fields of the View Geometry Extension to a STAC Item. View Geometry adds metadata related to angles of sensors and other radiance angles that affect the view of resulting data. It will often be combined with other extensions that describe the actual data, such as the `eo`, `sat` or `sar` extensions.

- [Example (Landsat 8)](../eo/examples/example-landsat8.json)
- [JSON Schema](json-schema/schema.json)
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