In order to reconstruct high-resolution images of sea surface temperature (SST) preserving the structural details using less amount of data

ridge and valley lines of SST

ridge lines of SST gradient and ridge lines of residual image were sampled. Combined with the land boundary and rectangle domain edges

the sampled points were set as boundary conditions.By the 9-point difference scheme of the Laplace equation

all nodes were calculated using finite-difference iterative method and the SST field was reconstructed. As a test

the SST image of level 3 MODIS product covering East China Sea and West Pacific in May 2012 was resampled and reconstructed. The result showed that the maximum absolute error between the retrieved image and the original one is less than 0.396 0 ℃. The reconstructed contours fit well with the original ones in the overlapped picture. It showed that the method for SST field reconstruction is feasible.