Excuse me, you are always very helpful.
My employer wants an image of Sentinel-1 at full resolution close to the ground.
I still don’t understand how to get this picture from Sentinel-1’s products, therefore I’m worried.
Thanks again.
Yes, I understand, I’ve been many years in your same situation so now it’s important for me to use SNAP to get these blessed photos.
You should study the SNAP and S1TBX tutorials that are available online. Do terrain correction to 10m pixel size into the projection you need. The resolution should be close to the original ~20m of the GRD products.
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Thanks, I’m reading tutorials from twenty days.
I have performed Terrain correction to 10m pixel.
Please, how do I decide which zoom/subset I have to stop in order to obtain a good photo with a resolution of ~20m? This is my problem.
Press the button (looks like magnifying glass) marked “P” in the navigation tool-window. This will show individual pixels in full display resolution. Then you can export your view to for example a .jpg with right-clicking on the image and selecting from the menus that pop up.
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Excuse me, is it correct to say that these two photos have the same resolution ~20m but only changes the zoom?
Now I think that it is an individual choice to stop zoom in order to obtain a good photo with a resolution of ~20m.
Thanks.
Yes, it is the same product, just different levels of zoom.
your level of zoom is completely independent from the spatial resolution or the pixel size. If you make a subset, the pixel size of the image stays the same.
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Unfortunately I mistakenly thought that SNAP decide even better photo but instead it is an individual choice.
Now I don’t know to choose the best answer so thank you to everyone. 
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Hello,
I have a similiar question as mast. I am being asked about the resolution of a processed image. Original product was Sentinel-1 Level 1 GRD product, IW swath. Problem is, that I used Multilooking proccess with 5 look in both range and azimuth. But does it change the resolution, if it is GRD product? And what number should I say? You know, if you are processing data from Sentinel-2, some bands have 10 m resolution, some 20 m and some 60 m. You have just 1 number there.
Thank you for the answers.
S1 GRD data is already of square pixel geometry (10x10m), so there is no ultimate need for multi looking unless you really need lower resolution.
Thank you.
But I already used the process of Multilooking and I can not change it anymore. Is there a way to tell how much was the resolution changed? And is the value of spatial resolution 10 meters originally?
It worth to take a look firstly at Acquisition resolution Level-1 SLC,
Then
The spatial resolution of GRD products ,
Thank you. But what does this mean?
Is there any option to get 1 number like you have with Sentinel-2 bands? That you simply have a band with resolution of 60 m?
when you enter a number of looks in the module, you see the resulting spatial resolution. As GRD is 10x10, any multiple of looks is simply the corresponding tenfold resolution in meter.
2 looks = 20x20 m
3 looks = 30x30 m
4 looks = 40x40 m
and so on
Thank you. I really appriciate the help from both of you. This is what I needed to know.
One can multilook in range, azimuth or both:
2 looks = 10x20m
4 looks = 20x20m
40x40m pixel size should correspond to ~16 looks, roughly speaking.
@mengdahl As @Mionel_Lessi was using GRD products I just referred to what SNAP does with it
Or do I miss a crucial point here?
Right, 3 looks in azimuth & 3 looks in range is 9 looks in total and produces 30x30m pixels. We are on the same page 
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I used 5 looks in azimuth and 5 looks in range. So it produces 50x50 pixels. Does that mean the spatial resolution is 50 m? Or is that something completly else? Is there a way to get just 1 number, as you can do with specific Sentinel-2 bands? For example B2 - Blue band is at spatial resolution of 10 m.
Hello @ABraun hope it finds you well. I want to know that how can we import and process CEOS
level 1A and 2 data of SAR radar not mentioned in the import list of sar sensors in snap?