.. index:: ! phasediff            

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phasediff         
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Synopsis
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**phasediff** *ref.PRM rep.PRM [-topo topo_ra.grd] [-model modelphase.grd]*


Description
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**phasediff** Compute phase difference of two images                 

Note: topo_ra and model in GMT grd format    

Required Arguments
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*ref.PRM*

	Parameter (PRM) file for the reference or master image

*rep.PRM*

	Parameter (PRM) file for the repeat or secondary image

Optional Arguments
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**-topo** *topo_ra.grd*

	Topography	

**-model** *modelphase.grd*

	Modeled phase

Example
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 ::

    phasediff