Image from the Sentinel-1's SLC product

[ABraun]

@mast

1. Could I get an image using only RangeDoppler Terrain correction module and zoom/subset?I think I should use also the multilook, is that right? But which one to choose?

regarding multi-looking:

Multilooking necessary when geocoding?

Multilooking is not mandatory. It fixes the inconsistent pixel sizes caused by the angle of the incoming signal and produces an image with “squared” pixels. As a nice side effect, speckle is reduced to a certain degree. When you cange the number of looks in the module you see the changes in your total resolution. If your data has a good resolution, TSX for example, you can apply multi-looking to reduce it to about 10 meters and still have sufficient resolution for most applications. However, if…

the resolution of your output is defined either:

1. in the multi-looking process as a result of range and azimuth looks.
   or if you skip multi-looking
2. in the RangeDoppler module as the smallest resolution possible.

Again, zooming in the data view has no effect on resolution. It’s the same data but viewed at different scale. it doesn’t affect any of the modules you perform on the data.