From Unwrapped SAR Interferogram Line of Sight (LOS) component & from the sub-pixel correlation of optical imagery, NS and EW true horizontal components are derived. Is it possible to get the true vertical component from these three derived components?
Yes, it should be possible - if you have 3 independent components of observation you can derive the full 3D displacement. You can first write out the InSAR LOS unit vector with its EW, NS, and vertical components, and then solve for the vertical component in terms of the others. Insert the LOS, EW and NS observations into your equation, and you can get the vertical displacement. Note that all the LOS unit vector coefficients are spatially dependent, so you will have to do it for each pixel separately. If you have even more observations, then you can do it in a least squares sense to help minimize the error.
Thanks for your to the point answer. I believe I have tried exactly what you are suggesting. Yet please check your inbox to have a look into the results.
Waiting for your reply.
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