Sentinel-1 terrain flattening reference

[Amirhossein]

Hello,

I’m working on sentinel-1 terrain flattening in SNAP software. Does anyone have a reference for terrain flattening algorithm which is done in SNAP?

Thanks in advance,

[ABraun]

Flattening Gamma: Radiometric Terrain Correction for SAR Imagery by @eyeinsky

presentation with more examples: Local Incidence Angle Considered Harmful