Dear,
I want to understand the full demonstration of this paper: Angular correction of the radiometric slope of Sentinel-1. Could someone give me a hand? Fig1 and Eq. 5 are not understandable because there is no clear demonstration of how equation 5 is obtained, nor the angles involved. A geometric clarification on the various angles would be very helpful to me.
Someone if you have any reference or if you can explain in detail I will be very grateful.
I am applying this correction to S1 images for mapping burned areas but if I can’t understand the rationale I’d rather not continue, I’m one of those who likes to understand the background and then move on.
Thanks in advance.
Dear ytarazona,
great you are interested in this article. In short, the equations are derived from the geometric interdependency of the incoming radar beam and the terrain. There are references to earlier elaborations. The article’s intent is to present a Google Earth Engine implementation, not to start from scratch. If you want to go deeper, I invite you to have a look at the references. Also make sure to be familiar with the imaging concept of a SAR in general, as this is where the angles come from. Note that this is not the best, but most practicable solution given the limitations of Earth Engine and the way the data is provided there. I’ve written another blogpost on what would ned ot be done ot overcome those limitations. Improved Sentinel-1 Analysis-Ready-Data on Google’s Earth Engine
I hope that helps,
Andreas