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| sar:instrument_mode| string |**REQUIRED.** The name of the sensor acquisition mode that is commonly used. This should be the short name, if available. For example, `WV` for "Wave mode" of Sentinel-1 and Envisat ASAR satellites. |
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| sar:frequency_band| string |**REQUIRED.** The common name for the frequency band to make it easier to search for bands across instruments. See section "Common Frequency Band Names" for a list of accepted names. |
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| sar:center_frequency| number | The center frequency of the instrument, in gigahertz (GHz). |
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| sar:polarizations|\[string]|**REQUIRED.** Any combination of polarizations. |
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| sar:product_type| string |***DEPRECATED** in favor of [`product:type`](https://github.com/stac-extensions/product).* The product type, for example `SSC`, `MGD`, or `SGC`|
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| sar:resolution_range| number | The range resolution, which is the maximum ability to distinguish two adjacent targets perpendicular to the flight path, in meters (m). |
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| sar:resolution_azimuth| number | The azimuth resolution, which is the maximum ability to distinguish two adjacent targets parallel to the flight path, in meters (m). |
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| sar:pixel_spacing_range| number | The range pixel spacing, which is the distance between adjacent pixels perpendicular to the flight path, in meters (m). Strongly RECOMMENDED to be specified for products of type `GRD`. |
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| sar:pixel_spacing_azimuth| number | The azimuth pixel spacing, which is the distance between adjacent pixels parallel to the flight path, in meters (m). Strongly RECOMMENDED to be specified for products of type `GRD`. |
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| sar:looks_range| number | Number of range looks, which is the number of groups of signal samples (looks) perpendicular to the flight path. |
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| sar:looks_azimuth| number | Number of azimuth looks, which is the number of groups of signal samples (looks) parallel to the flight path. |
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| sar:looks_equivalent_number| number | The equivalent number of looks (ENL). |
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| sar:observation_direction| string | Antenna pointing direction relative to the flight trajectory of the satellite, either `left` or `right`. |
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| sar:swath|\[Beam Object]| Composition of the swath of the SAR acquisition. |
| sar:instrument_mode| string |**REQUIRED.** The name of the sensor acquisition mode that is commonly used. This should be the short name, if available. For example, `WV` for "Wave mode" of Sentinel-1 and Envisat ASAR satellites. |
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| sar:frequency_band| string |**REQUIRED.** The common name for the frequency band to make it easier to search for bands across instruments. See section "Common Frequency Band Names" for a list of accepted names. |
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| sar:center_frequency| number | The center frequency of the instrument, in gigahertz (GHz). |
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| sar:polarizations|\[string]|**REQUIRED.** Any combination of polarizations. |
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| sar:product_type| string |***DEPRECATED** in favor of [`product:type`](https://github.com/stac-extensions/product).* The product type, for example `SSC`, `MGD`, or `SGC`|
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| sar:resolution_range| number | The range resolution, which is the maximum ability to distinguish two adjacent targets perpendicular to the flight path, in meters (m). |
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| sar:resolution_azimuth| number | The azimuth resolution, which is the maximum ability to distinguish two adjacent targets parallel to the flight path, in meters (m). |
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| sar:pixel_spacing_range| number | The range pixel spacing, which is the distance between adjacent pixels perpendicular to the flight path, in meters (m). Strongly RECOMMENDED to be specified for products of type `GRD`. |
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| sar:pixel_spacing_azimuth| number | The azimuth pixel spacing, which is the distance between adjacent pixels parallel to the flight path, in meters (m). Strongly RECOMMENDED to be specified for products of type `GRD`. |
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| sar:looks_range| number | Number of range looks, which is the number of groups of signal samples (looks) perpendicular to the flight path. |
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| sar:looks_azimuth| number | Number of azimuth looks, which is the number of groups of signal samples (looks) parallel to the flight path. |
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| sar:looks_equivalent_number| number | The equivalent number of looks (ENL). |
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| sar:observation_direction| string | Antenna pointing direction relative to the flight trajectory of the satellite, either `left` or `right`. |
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| sar:swath|\[[Beam Object](#beam-object)]| Composition of the swath of the SAR acquisition. |
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**Note:** In this specification *range* values are meant to be measured perpendicular to the flight path and *azimuth* values
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are meant to be measured parallel to the flight path.
@@ -64,7 +64,7 @@ In assets `sar:polarizations` can contain duplicate elements and, if possible, t
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### Beam Object
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The `sar:swath` field is an array of objects that describe the composition of the swath of the SAR acquisition.
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The beam object is used to describe the swath of the SAR acquisition.
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According to the instrument mode defined in `sar:instrument_mode`, the `sar:swath` is composed of one or more beams.
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