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Sentinel-3 deprecated fields mapping
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@emmanuelmathot
emmanuelmathot committed Jun 10, 2024
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Expand Up @@ -25,13 +25,17 @@ The fields in the table below can be used in these parts of STAC documents:
- [ ] Assets (for both Collections and Items, incl. Item Asset Definitions in Collections)
- [ ] Links

| Field Name | Type | Description |
| -------------------- | --------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| altm:instrument_type | string | Primary instrument type. See the list of [primary instrument types](#primary-instrument-types). |
| altm:instrument_mode | string | Instrument mode. |
| altm:sampling_rate | number | Sampling rate of the instrument in Hz. |
| Field Name | Type | Description |
| -------------------- | --------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| altm:instrument_type | string | Primary instrument type. See the list of [primary instrument types](#primary-instrument-types). |
| altm:instrument_mode | string | Instrument mode. |
| altm:sampling_rate | number | Sampling rate of the instrument in Hz. |
| altm:nominal_track | [GeoJSON LineString Coordinates Array](https://datatracker.ietf.org/doc/html/rfc7946#section-3.1.4) | An array of coordinates used to define the nominal track on the earths surface. This track is essentially a line that is representative of the product but does not include points for every value. This value is recommended ONLY if the item geometry is not representative of the track. |

> \[!NOTE]
> Various fields and objects in this extensions replace [deprecated fields](https://github.com/stac-extensions/sentinel-3/blob/main/deprecated.md) from the [sentinel-3 extension](https://github.com/stac-extensions/sentinel-3).
> Please see the section sentinel-3 mapping for more information.
### Primary Instrument Types

The following values are valid for the `altm:instrument_type` field:
Expand All @@ -44,6 +48,15 @@ The following values are valid for the `altm:instrument_type` field:
| microwave | Microwave Radiometer |
| other | |

### Sentinel-3 Mapping

The following table shows the mapping between the [deprecated fields](https://github.com/stac-extensions/sentinel-3/blob/main/deprecated.md) in the [Sentinel-3 extension](https://github.com/stac-extensions/sentinel-3) and the fields in the Altimetry extension.

| Sentinel-3 Field Name | Altimetry Field Name | Altimetry Field Value |
| --------------------- | ---------------------- | --------------------- |
| `s3:lrm_mode` | `altm:instrument_mode` | `lrm` |
| `s3:sar_mode` | `altm:instrument_mode` | `sar` |

## Contributing

All contributions are subject to the
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