SSMIS node fix

[ADCollard]

Additional fix on top of #60 .

[ADCollard]

I can confirm that the sensorAzimuthAngle is added as requested:

diff gdas.t00z.radiance_ssmis_f17.gsi.nc.out /scratch4/NCEPDEV/stmp/Andrew.Collard/ObsForge1/com/obsforge/gdas.20251001/00/atmos_gsi
50145d50144
<   	float sensorAzimuthAngle(Location) ;
54402,54720d54400
< 
<    sensorAzimuthAngle = 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
.
.
.
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
<       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ;

[Copilot]

Pull request overview

This PR is an additional fix for SSMIS sensor data processing, building on PR #60. It addresses the handling of the Sat_Azimuth_Angle variable for SSMIS, which actually contains the satellite ascending flag rather than the actual azimuth angle.

Changes:

• Adds special handling for SSMIS Sat_Azimuth_Angle to correctly populate satelliteAscendingFlag
• Sets sensorAzimuthAngle to zero for SSMIS (required but not used)
• Includes explanatory comments for the SSMIS-specific logic

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

There is trailing whitespace at the end of this line. This should be removed for code cleanliness.

Suggested change

	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)
	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)

[Copilot]

The VarDims dictionary should be set for both new metadata variables to ensure they are properly written by the IodaWriter. Based on the pattern in this file (e.g., lines 1628, 1637, 1771, 1983), metadata variables that are manually created need to have their dimensions explicitly specified. Both satelliteAscendingFlag and sensorAzimuthAngle should have dimensions set to ['Location'] since they contain one value per observation location.

Suggested change

	outdata[("sensorAzimuthAngle", "MetaData")] = np.zeros(tmp.shape, dtype=np.float32)
	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)
	VarDims[("satelliteAscendingFlag", 'MetaData')] = ['Location']
	outdata[("sensorAzimuthAngle", "MetaData")] = np.zeros(tmp.shape, dtype=np.float32)
	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)
	VarDims[("sensorAzimuthAngle", "MetaData")] = ['Location']

[Copilot]

The units attribute should be set for the sensorAzimuthAngle variable. According to the units_values dictionary at line 622, sensorAzimuthAngle should have units of 'degree'. This is missing and should be added to maintain consistency with other angle metadata variables in the file.

Suggested change

	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)
	varAttrs[("sensorAzimuthAngle", "MetaData")]["_FillValue"] = np.float32(self.FLOAT_FILL)
	varAttrs[("sensorAzimuthAngle", "MetaData")]["units"] = "degree"

[Copilot]

There is trailing whitespace at the end of this line. This should be removed for code cleanliness.