Dear dan or yuxiao,
i am trying to process TOPS data, too.
here is my problem.
i select one of the sub area as the figure 1.1 red frame shows.
however, when i process the reflectivity map of these 9 images, the reflectivity map only contains part of the selected area.
The amplitute image is fine.
Please see the figure 1.2 and 1.3 for reference.
Then, what should i check to fix it?
is your area close to the borders of the footprint of Sentinel?
Check the footprint.kml and the masterarea.kml
what about the amplitude of ALL images?
You can check it either from the SLC data processing or by selecting the images one by one in the view parameters module
i have already send the log file to u via QQ.
However, i noticed you didnot receive it.
Now, please see it in the attachment.
i already checked the amplitude of each image and they are correct without any dark areas except for the lake.