Overlap two different S1 images

[falahfakhri]

You could use the SNAP help to get the information you need, for example

In general, I found to you good tutorials in here,

Geocoded and orthorectified images to full resolution

please have a look at this tutorial. It is using Radarsat data but the processing steps are the sampe for Sentinel-1. http://sentinel1.s3.amazonaws.com/docs/S1TBX%20SAR%20Basics%20Tutorial.pdf You will find more tutorials here: http://step.esa.int/main/doc/tutorials/sentinel-1-toolbox-tutorials/ Please also be aware of the different image products (levels of pre-processing) There is some more information in other topics about the different steps of pre-processing: