Do you have any detail documentation about each algorithm?
especially, I’d like to know about ‘slant range to ground range’ and ‘Ellipsoid correction using average height’ that correspond to level processing in other satellites. (e.g. SSC to MGD and SSC to GEC in TSX)
in case you mean the source codes and the mathematics behind the algorithms, you can access them here: https://github.com/senbox-org/s1tbx/tree/master/s1tbx-op-sar-processing/src/main/java/org/esa/s1tbx/sar/gpf/geometric
A more explantory description is found in the help section of SNAP
Thank you very much.
Additionally, may I ask your opinion about one question?
I want to display some pixels in the original SLC image and retain those pixels after SRGR and Ellipsoid correction processing.
Do you think I can convert the original pixel coordinates to processed image pixel coordinates by referring to the github equations you gave me?
Or should I find those pixels again in the processed images?
I think it is easier to mark these pixels using pins, then apply the ellipsoid correction and check the pixels in the output product.