How can ı determine VERTİCAL DISPLACEMENTS on PS points from LOS velocities on Sentinel-1 images ?

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Hello Dear Helpers, 

I processed Sentinel-1 images in STAMPS/PSI software and ı determined  PS points velocities on LOS direction, now how can ı define the vertical displacements on this PS points from LOS velocities?

Can ı determine the vertical displacement map from this LOS direction velocities map in matlab or in this software by writing a code in a pratical way? 

Or if there is no pratical way, then what should ı do or which formula ı should use for determining vertical velocities ? 

Thank you so much