Questions about Resampling and Oversampling

[owen]

Hi,

I have known that the RESAMPLING_TYPE is the interpolating function and the OVERSAMPLING represents the number of grids used when interpolating. But usually, how to determine these two parameters? I am not quite sure...

Thank you~

[Emmanuel Bertin]

Hi owen,

as explained on page 17 of the SWarp documentation, the choice of the resampling function (RESAMPLING_TYPE) is a matter of preserving the spatial frequency content of the image vs dealing with artifacts, edges or undersampled data. The default Lanczos3 kernel is generally the best compromise for properly sampled images.
You shouldn't generally worry about the OVERSAMPLING parameter, it is automatically adjusted by default.
- Emmanuel.