Identifying correct angular parameters in Sentinel-1 metadata for GNSS-to-LOS projection

[wael1697]

Context: I am working on integrating GNSS and SAR data processing, specifically trying to project 3D GNSS displacements into Sentinel-1 Line-of-Sight (LOS) direction.

Question: I need to identify the correct angular parameters in Sentinel-1 metadata that represent:
1. The incidence angle
2. The azimuth look angle

These parameters are essential for accurate geometric projection of GNSS measurements into radar geometry. However, I'm finding multiple fields in the Sentinel-1 metadata that could potentially represent these angles, creating ambiguity in which values should be used for the projection.

Technical details:
- Data product: Sentinel-1 SLC
- Processing task: GNSS to SAR LOS projection
- Required parameters: Incidence angle, azimuth look angle
- Current challenge: Ambiguity in metadata field interpretation

Could you please help identify which specific metadata fields in Sentinel-1 products should be used for this geometric transformation?

[ASF - ffwilliams2]

What type of SAR product are you using? Are you performing InSAR? Most InSAR processors will include this information in the output metadata.