If you are working in arid regions with limited vegetation, generating a DEM from Sentinel-1 images could work quite well. Resolutions of around 12 meters are feasible then.

But if you are working on whole Uzbekistan this is not an ideal solution because of the limited coverage of single S1 scenes. Or do you only work in a smaller part or catchment?

Dear Andras Braun,

Thank you for your response. I may use the DEM foe whole of the country and for the some parts like mountanous areas.

How to download or generate DEM from Sentinel 1 images. As i know Sentinel 1 has SAR sensor.

Generation of DEMs from SAR data requires quite a lot of computing capacity. Besides that, it is not an easy task if you are unexperienced with SAR data because it involves a lot of parameters and decisions which have to be considered well-grounded.

Breaking it down into managable pieces, DEMs can be created by:

ESA has published nice documents on InSAR, especially for beginners:

http://www.esa.int/esapub/tm/tm19/TM-19_ptA.pdf (theory)

http://www.esa.int/esapub/tm/tm19/TM-19_ptB.pdf (more practical)

http://www.esa.int/esapub/tm/tm19/TM-19_ptC.pdf (mathematics behind)

I just tried it for a small area in Uzbekistan and the results are quite promising:

upper left: Interferogram of both scenes

upper right: Coherence

bottom left: Unwrapped interferogram

bottom right: Geocoded elevation (resolution 12 m)

However, as stated, this will only work if vegetation is as sparse as in the example and processing of the whole country is probably too much.

Thank you Andreas,

Really useful information you have shared.

Yes you can.Try the following link

https://www.satimagingcorp.com/satellite-sensors/other-satellite-sensors/sentinel-2a/

Thank you Shimeles.