After performing terrain flattening and topographic correction of the GRD product in Step latest version, I obained only gamma naught. Can not I get sigma naught?
I also have this question. It’s possible to calculate sigma0 from gamma0, but I am running into a problem:
Were you ever successful in getting sigma0?
@polar, not yet!
I’m thinking to use gamma0 after terrain flattening and terrain correction.
I thought that terrain flattening procedure gives gamma0 only.
@ChengTan – TF does only give gamma0, but gamma0 is convertible to sigma0 (e.g., see slide 39: www.nrsc.gov.in/isprs/pdf/4.%20SAR_Backscatter-Extraction_new.pdf) and I have done this now successfully in the link in my previous reply.
However, I am not very experienced with this, so I can’t say this conversion is appropriate.
More info can be found here:
Small, D. (2011), Flattening Gamma: Radiometric Terrain Correction for SAR Imagery, IEEE Transactions on Geoscience and Remote Sensing, 49(8), 3081–3093, doi:10.1109/TGRS.2011.2120616.
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