GAMMA Questions

Dear Gamma users,

After selecting the reference point from the region where PS points are densely populated, while doing the regression analysis with multi reference stack for Sentinel-1A datasets using 'multi_def_pt' (used command line is given below), I am getting following estimation of linear deformation as shown in the attached image.

multi_def_pt pt - pSLC_par - itab pbase 0 pdiffa 1 69515 pres1 pdh1 pdef1 punw1 psigma1 pmask1 90. -0.01 0.01 100 1.2 1.1 1 0 1

However, in this image if you look closely, the phase values are there till certain range sample point (in this case last point of OSAKA land, before start of the bridge). FYI, the Kansai airport inside the sea is my AOI and no phase information is present on that area. The PS points placed right side aren't also showing any phase information in linear deformation trend. Is it something to do with the reference point selection? Or I am committing any mistake taking any particular parameter while executing 'multi_def_pt'.

Any suggestion will be highly appreciated.

Regards,
Tapas