Sr I 4607 Å spectral line shows one of the strongest scattering polarization signals in the visible solar spectrum .
The amplitudes of these signals are expected to vary at granular spatial scales .
This variation can be due to changes in the magnetic field intensity and orientation ( Hanle effect ) as well as due to spatial and temporal variations in the plasma properties .
Measuring the spatial variation of such polarization signal would allow us to study the properties of the magnetic fields at subgranular region .
But , the observations are challenging since both high spatial resolution and high spectropolarimetric sensitivity are required at the same time .
To the aim of measuring these spatial variations at granular scale , we carried out a spectro-polarimetric measurement with the Zurich IMaging POLarimeter ( ZIMPOL ) , at the GREGOR solar telescope at different limb distances on solar disk .
Our results show a spatial variation of scattering linear polarization signals in Sr I 4607 Å line at the granular scale at every \mu , starting from 0.2 to 0.8 .
The correlation between the polarization signal amplitude and the continuum intensity imply statistically that the scattering polarization is higher at the granular regions than in the intergranular lanes .