Hi Forum,
As in the title, what is sigma0 (as in sigma0 band)?
Thanks
https://earth.esa.int/handbooks/asar/CNTR5-3.html#eph.asar.gloss.prodt:SIGMA
Scattering coefficient, or the conventional measure of the strength of radar signals reflected by a distributed scatterer, usually expressed in dB. It is a normalised dimensionless number, comparing the strength observed to that expected from an area of one square metre. Sigma nought is defined with respect to the nominally horizontal plane, and in general has a significant variation with incidence angle, wavelength, and polarisation, as well as with properties of the scattering surface itself. See also chapter 3 āPre-flight Characteristics and Expected Performanceā and Backscatter in radar glossary.
āHow strong the radar signals reflected back areā
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Many thanks for your comprehensive reply.
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Sigma0 is the calibrated backscatter coefficient. It is a normalized measure for the intensity of a pixel.
It is based on a calibration constant (often expressed as Beta0) and the incidence angle of the incoming signal:
These might be helpful:
The Radar Backscattering Coefficient
Radar Backscatter
TerraSAR-X - Tipps & tricks
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Thanks to Abraun too.
I wasnāt aware of the Earthnet glossary - very useful. I was trying to find answers on google or wikipedia!
Hi Andy,
Would you please to send me the source of this literature http://shodhganga.inflibnet.ac.in/bitstream/10603/78785/11/11_chapter%204.pdf
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sorry, I also just found this chapter. I donāt have the full book.
The url works for me, do you have problems downloading?
No, it works for me as well, but Iām asking about the title of this book and the year of publishing.
ah, sorry. I donāt know where it is from actually.
I think the chapter is interesting as it compares Beta, Sigma and Gamma. But what I miss is the authorās definition of Gamma. This is nowhere stated and many have different interpretations of it.
If you (or anyone else) is looking for the thesis, itās here:
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