As the key step of InSAR data processing

many phase unwrapping algorithms were introduced. But these algorithms had difficulties with high noisy interferogram. This paper introduced a new method based on netowrk flow algorithm in irregular network

out of regard for high interferometric coherence and neglecting low coherence data area. First

a new phase data set with high quality data is created. Delaunay triangulation network can be derived according to the positions of the high quality phases in the image and the residue of each triangulation in the network is calculated. According to the positions of the residues in the irregular network the flows are computed by the network flow algorithm

we can integrate along the flows and derive the unwrapped phases. Finally

we compare the unwrapped phase image computed by network flow method with the image by traditional path finding method. From the comparison

we can conclude that the network flow method can increase the accuracy of the phase unwrapping and decrease the error occured noise.