Sentinel 1 DEM


#1

Hi every one,
I tried to generate DEM using sentinel 1 data, But the results not good.
The max. elevation In AOI is about 30 m but the resulted is strange(reach t 130 m)
My procedures were
image
image
image

Any help please?


#2

where is your study area located?
Can you please share screenshots of your interferogram and coherence rasters?


#3

Sorry for the delay,
the study area located in Egypt , port said
interferogram :
image

coherence
image


#4

doesn’t look too bad actually.

To prevent unwrapping errors you could mask low coherence areas before running snaphu as described here: https://rus-copernicus.eu/forum/t/masking-low-coherence-areas-before-unwrapping/147

Maybe filtering or multi-looking before unwrapping could increase the quality of the interferogram and increase the chance for correct unwrapping.

Have you created a difference between SRTM and your raster to identify where the discrepancy is largest?


#5

actually, I applied 0.3 as a coherence mask .
i will try again and come back .

Regards


#6

Thanks a lot dear ABraun
it corrected .


#7

were you able to solve your problem? If so, how?