[vegetation monitoring] really bright parcels in VV polarization


(I’m not sure that my post is directly related to this forum, I can delete my post if necessary).

I’m currently working on S1 SAR images for vegetation analysis (maize parcels). I observed that few parcels are much brighter than the others regarding their VV polarization. The thing is that looking at a S2 image, I can’t see any difference that could explained why this is occurring. Note that this phenomenon seems to occur with bare ground only so I am suspecting an interaction between S1 and the ground. Also, it occurs at different acquisition dates (not only once), consequently it can’t be a “coincidence”.

I put an example, where the parcel at the left is clearly brighter than the others. This is a composite image (Red is linear VH and Green is linear VV). Values are close to 30, instead of ~0.3 for the normal parcels. I can give you more information/images if necessary.

Thanks a lot,

I think this what you’re looking for,

And this

1 Like


Actually I’m looking for a physical explanation (or more an agronomic explaination) of this phenomenon.

The simplest explanation could be the form of plowing, but as I’m not a SAR specialist maybe other parameters could interact.

It could be the orientation of the plowing causing high backscatter at some observation angles.

1 Like

Thanks! It seems the most probable explanation indeed, I wanted to be sure (maybe some people working on that field are used to deal with this situation).

Here’s a good related reference:



Really interesting, thanks a lot!

Another study few years later regarding this topic : https://ieeexplore.ieee.org/document/6351968