With SAED Pattern one can calculate the diameter of the rings and so the radius Take revere of the radius (1/r) and we can have the interplanar spacing in nm or Angstrom.
How to do the lattice planes measurements Or we can verify it with the reported results if any.
The diffraction ring spacings (often labeled as d_hkl - which correspond to the Miller index plane with indices h, k, l) depend on the lattice system of the observed material. The equations for each lattice system is given here (and in many crystallography textbooks):
https://www.quora.com/How-do-I-calculate-the-interplanar-spacing-of-a-crystal
If you find the d-spacing value from SAED pattern, then you can match with your XRD results. This is the one of the best way to confirm the lattice planes.
for more details you can read the followings:
https://www.tcd.ie/Physics/research/groups/pan/teaching/PY5019/notes/IndexingDPs.pdf
https://cdn.intechopen.com/pdfs/49537.pdf
Also read this discussions:https://www.researchgate.net/post/How_to_analyze_The_SAED_pattern_generated_by_TEM_and_how_to_calculate_the_d_spacing_from_it_and_what_are_the_parameters_I_need_know