2

I did kriging spatial interpolation using climatic point file.

After doing interpolation, how can I resize the pixel resolution to pixel resolution of the NDVI data.

NDVI image's pixel resolution is 250m.

3

Raster resampling is what you're looking for. Check:

Changes the cell size of a raster.

Different raster datasets do not need to be stored using the same cell resolution. But when you are processing between multiple datasets, the cell resolution, like the registration, needs to be the same. When multiple raster datasets are input into any ArcGIS Spatial Analyst function and their resolutions are different, one or more of the input datasets will be automatically resampled using the nearest neighbor assignment to the coarsest resolution from input datasets.

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