Revert fields from SAR to CARD4L

radiantearth · Feb 15, 2021 · 1051a45 · 1051a45
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Showing 4 changed files with 2 additions and 18 deletions.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,7 +13,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added [processing extension](extensions/processing/README.md)
 - Added [file info extension](extensions/file/README.md) ([#879](https://github.com/radiantearth/stac-spec/pull/879), [#921](https://github.com/radiantearth/stac-spec/issues/921))
 - Added additional acquisition parameters in the `sat` extension: `sat:platform_international_designator`, `sat:absolute_orbit`, `sat:anx_datetime` ([#894](https://github.com/radiantearth/stac-spec/pull/894))
-- Added properties to the `sar` extension: `sar:measurement_type`, `sar:measurement_convention` ([#961](https://github.com/radiantearth/stac-spec/pull/961))
 - Recommendation to enable CORS
 - Added STAC CARD4L SAR Normalized Radar Backscatter (NRB) Extension
 

diff --git a/extensions/card4l-sar/README.md b/extensions/card4l-sar/README.md
@@ -92,6 +92,8 @@ STAC Items must always be valid, but not all STAC Item requirements are covered
 | card4l:speckle_filtering               | [Speckle Filter Object](#speckle-filter-object) \| null | `Filtering`, `FilterApplied`                                 | **REQUIRED.** Set to `null` if `FilterApplied` would be set to `false`. Otherwise make it an [Speckle Filter Object](#speckle-filter-object). | ✗           | ✓ 1.7.4     |
 | card4l:border_pixels                   | integer                                                 | `NumBorderPixels`                                            | Number of border pixels (**required** if applicable). To be specified either globally for all assets with role `data` or individually [per asset](#stac-item-assets). | ✗           | ✓ 1.7.7     |
 | card4l:pixel_coordinate_convention     | string                                                  | `PixelCoordinateConvention`                                  | **REQUIRED.** One of `center` (pixel center), `upper-left` (pixel ULC) or `lower-left` (pixel LLC) | ✗           | ✓ 1.7.8     |
+| card4l:measurement_type                | string                                                  | `BackscatterMeasurement` (NRB)                               | **REQUIRED.** Must be set to `gamma0`.                       | ✗           | ✓ 3.1       |
+| card4l:measurment_convention           | string                                                  | `BackscatterConvention` (NRB)                                | **REQUIRED.** Must be set to `amplitude`, `power` (both NRB + POL) or `angle` (POL only). | ✗           | ✓ 3.1       |
 | card4l:conversion_eq                   | string                                                  | `BackscatterConversionEq` (NRB), `ScalingConversionEq` (POL) | **REQUIRED.** Indicate equation to convert from the data to logarithmic decibel scale, see the CARD4L specification (3.2) for details. | ✗           | ✓ 3.2       |
 | card4l:relative_rtc_accuracy           | number                                                  | `Relative` in `RTCAccuracy`                                  | Relative accuracy of the Radiometric Terrain Correction in decibel. | ✗           | ✓ 3.5       |
 | card4l:absolute_rtc_accuracy           | number                                                  | `Absolute` in `RTCAccuracy`                                  | Absolute accuracy of the Radiometric Terrain Correction in decibel. | ✗           | ✓ 3.5       |
@@ -158,8 +160,6 @@ The following fields are all specified in CARD4L requirement 1.7.4. It is **requ
 | sar:pixel_spacing_range   | `RangePixelSpacing`                                          | **REQUIRED.** Convert to meters, if required.                | ✓ 1.6.7 | ✗       |
 | sar:resolution_azimuth    | `AzimuthResolution`                                          | **REQUIRED.** Convert to meters, if required.                | ✓ 1.6.7 | ✗       |
 | sar:resolution_range      | `RangeResolution`                                            | **REQUIRED.** Convert to meters, if required.                | ✓ 1.6.7 | ✗       |
-| sar:measurement_type      | `BackscatterMeasurement` (NRB)                               | **REQUIRED.** Must be set to `gamma0`.                       | ✗       | ✓ 3.1   |
-| sar:measurment_convention | `BackscatterConvention` (NRB)                                | **REQUIRED.** Must be set to `amplitude`, `power` or `angle` (POL only). | ✗       | ✓ 3.1   |
 
 #### Satellite
 

diff --git a/extensions/sar/README.md b/extensions/sar/README.md
@@ -36,8 +36,6 @@ To describe frame start and end times, use the [Date and Time Range fields](../.
 | sar:looks_azimuth           | number    | Number of azimuth looks, which is the number of groups of signal samples (looks) parallel to the flight path. |
 | sar:looks_equivalent_number | number    | The equivalent number of looks (ENL). |
 | sar:observation_direction   | string    | Antenna pointing direction relative to the flight trajectory of the satellite, either `left` or `right`. |
-| sar:measurement_type        | string    | The product's type of measurement. One of `beta0`, `gamma0` or `sigma0`. |
-| sar:measurement_convention  | string    | The product's measurement convention. For example, `amplitude` (linear amplitude), `power` (linear power) or `angle`. |
 
 **sar:polarizations** specifies a single polarization or a polarization combination. For single polarized radars one of `HH`, `VV`, `HV` or `VH` must be set. Fully polarimetric radars add all four polarizations to the array. Dual polarized radars and alternating polarization add the corresponding polarizations to the array, for instance for `HH+HV` add both `HH` and `HV`.
 

diff --git a/extensions/sar/json-schema/schema.json b/extensions/sar/json-schema/schema.json
@@ -115,19 +115,6 @@
                 "left",
                 "right"
               ]
-            },
-            "sar:measurement_type": {
-              "title": "Product measurement type",
-              "type": "string",
-              "enum": [
-                "beta0",
-                "gamma0",
-                "sigma0"
-              ]
-            },
-            "sar:measurement_convention": {
-              "title": "Product measurement convention",
-              "type": "string"
             }
           }
         },