I am doing interferometry with Sentinel1 (IW mode). I used two images and made coherence and interferogram.
Now, I want to plot sigma0 (dB) of image1 versus coherence two images. I do not know how can I do this by SNAP. I saw some videos about plotting in SNAP but I do not think so they can be related to ‘Sigma0 versus coherence’.
Please guide me.
I saw one example with Cosmos-skymed satellite in this paper ‘X-Band Interferometric SAR Observations of Baltic Fast Ice’ but I do not know how can I do that by snap? Should I use pin manager or something else?
Correlative plot ‘Sigma0 versus coherence’ picture by Cosmos-skymed here. I want something like this.
First of all, you told me, I should Calibrate image A (or B) to retrieve Sigmao S. As my images (A and B) are in IW mode, I used SLC to GRD and then, I did like this on GRD image:
Raster……Data convertion…linear to/from Db
So I have sigma0-vv-dB
Am I right?
for InSAR you need SLC products, your coherence image is in slant geometry.
as you said, you calculated Sigma0db based on a GRDH product. This is already pre-processed (squared pixels) so you also need to have the Sigma0db layer in slant geometry. Use the original SLC data to calculate Sigma0.
Please also see here:
You could, as well, geocode both rasters to ground range and then clip to the same extent but this is also tricky.