Use of SNAP for sentinel 1A


Hi, yes if you follow the steps described in Section 5 of the S-1 Radiometric Calibration document,, then your point targets could be used to match the LUT’s values.

However, I suggest you use a different approach - calculate the measured radar cross-section of your point targets (I assume these corner reflectors) and compare with the theoretical radar cross-section of your CRs. Ideally the differences should be small.


thank you

how to find in which subswath of SLC IW image, does our location falls since subswaths when displayed using snap tool shows same lat long for each subswath
I need guidnace to merge 3 subswaths into single SLC image


The TOPSAR-Merge module enables you to do that. The images just need to be first debursted (TOPSAR-Deburst).


It’s not a perfect solution, but you can open the kmz file stored with each product in Google Earth and compare visually


thank you
Mr. Peter
I tried hard to locate corner reflector in SLC , IW image of Sentinel 1A
Mr. peter, could you assist me to locate corner reflector ( trihedral triangular , 1m) in SLC image
deployment location: lat 12°38’15"N long 77°26’25.72"E
Dates of deployment: 21/07/2017, 2/8/2017, 7/9/2017, 25/10/2017, 18/11/2017, 6/3/2018


Hi, I have obtained one of your image - from 06/03/2018 - and located your corner reflector. It is at pixel coordinates 10177, 12657 in sub-swath IW2. The cross in the image below shows the predicted position using a terrain height of 660 m. The CR will be at a similar position for your other images.


Mr Peter, thank you, this will be quite helpful to me


Hi peter
kindly guide me to find the elevation angle for my location : lat 12°38’15"N long 77°26’25.72"E
for Sentinel 1A pass


Hi, could you please expand on which angle you are wanting to calculate and why. For example, is it the incident angle at your location from the product annotation. Many thanks.