Interpolating Merra reanalysis Merra re-analysis ara available for  a coarser horizontal grid with resolution of 0.625 × 0.5 degrees providing differents parameters : Precipitation, Temperature ....This been said, I want to interpolate continuously theses parameters ( More precisely : For each coordinate I want to know elevation, Precipitation , and other parameters ( Look the following example ).

Time step  // Latitude // Longitude // Elevation // Precipitation  ...

1    ................ 30    .............     -7     ..................   1500 ...................       x             x    x ....x 

1       ...............          30.25   .........     -7   ...................     x x ..........................x

1  .................             31.11  .....      -6.63    ...................xx.......................X

If you have an idea how to interpolate these data I would be grateful.
I strongly recoment using interp2 funtion from Matlab or any other equivalent in other languages. I have used it to do similar tasks.