RAD-172 Sky Background (#432)

* Initial attempt.

* Initial commit.

* Added unit to sky background level.

* Updated unit tags.

Author: PaulHuwe

CHANGES.rst

@@ -1,7 +1,7 @@
 0.20.1 (unreleased)
 -------------------
 
--
+- Added sky background schema. [#432]
 
 0.20.0 (2024-05-15)
 -------------------

src/rad/resources/manifests/datamodels-1.0.yaml

@@ -130,6 +130,11 @@ tags:
   title: Outlier Detection information
   description: |-
     Outlier Detection information
+- tag_uri: asdf://stsci.edu/datamodels/roman/tags/sky_background-1.0.0
+  schema_uri: asdf://stsci.edu/datamodels/roman/schemas/sky_background-1.0.0
+  title: Sky Background Information
+  description: |-
+    Sky Background Information
 - tag_uri: asdf://stsci.edu/datamodels/roman/tags/resample-1.0.0
   schema_uri: asdf://stsci.edu/datamodels/roman/schemas/resample-1.0.0
   title: Resample information

src/rad/resources/schemas/sky_background-1.0.0.yaml

@@ -0,0 +1,39 @@
+%YAML 1.1
+---
+$schema: asdf://stsci.edu/datamodels/roman/schemas/rad_schema-1.0.0
+id: asdf://stsci.edu/datamodels/roman/schemas/sky_background-1.0.0
+
+title: Sky Background Information
+type: object
+properties:
+  level:
+    title: Sky Background Level
+    description: |
+      The sky background level in DN / s.
+    anyOf:
+      - tag: tag:stsci.edu:asdf/unit/quantity-1.*
+        properties:
+          datatype:
+            enum: ["float64"]
+          unit:
+            oneOf:
+            - tag: tag:stsci.edu:asdf/unit/unit-1.*
+            - tag: tag:astropy.org:astropy/units/unit-1.*
+            enum: ["DN / s", "MJy.sr**-1"]
+      - type: "null"
+  method:
+    title: Sky Background Method
+    description: |
+      The method by which the sky background was determined.
+    type: string
+    enum: ["None", "local", "global+match", "match", "global"]
+  subtracted:
+    title: Sky Background Subtraction Flag
+    description: |
+      A boolean value which indicates whether the sky background has
+      been subtracted form the image or not.
+    type: boolean
+propertyOrder: [level, method, subtracted]
+flowStyle: block
+required: [level, method, subtracted]
+...

src/rad/resources/schemas/wfi_image-1.0.0.yaml

@@ -26,6 +26,8 @@ properties:
             tag: asdf://stsci.edu/datamodels/roman/tags/outlier_detection-1.0.0
           source_detection:
             tag: asdf://stsci.edu/datamodels/roman/tags/source_detection-1.0.0
+          background:
+            tag: asdf://stsci.edu/datamodels/roman/tags/sky_background-1.0.0
         required: [photometry, wcs]
   data:
     title: Science Data (DN / s) or (MJy / sr)