I need to regrid temperature dataset from 1 degree to 0.5 degree. In case we have data available for all grids falling in a square, as shown below, we can simply regrid it using bilinear/bicubic interpolation method in MATLAB.
But, the data grids which I have forms an irregular shape i.e., there are no values outsie the given grids as shown below.
How to do regriding in this case ?