Heading and azimuth angle

Are azimuth and heading angle different?
In S1 metadata, I see platformheading=somevalue. Is it measured positive w.r.t to north?
How to obtain azimuth angle for every pixel in SAR image?

If azimuth angle refers to what i think it does, all the pixels in the image have the same angle because the images are focused into zero-doppler geometry.

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Then could you tell me how to obtain azimuth angle for a Sentinel-1 image?

Hello sekharv, have you solved this problem? I’m now having this problem too, and I want to extract the angle of incidence information of sentinel-1 data with latitude and longitude information. How does this need to be achieved? Thank you very much.