Can we get the look angle of the SAR sensor on a large image for a given coordinate, if we only have the look angle in the mid-swath (or the near-range & far-range angles)?

Do we get the look angle at a specific location by interpolation or is there a more precise method to estimate it?

If we take as an example of a SAR sensor Sentinel-1, the look angle changes inside the same image from a region to another, especially if the image is large (as is the case of the images taken by Sentinel-1 in the Interferometric Wide Swath mode).


I've found out that Sentinel-1 products are provided with a tie point grids having a map of incident angles.

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