A page describing what we want in regridders for ACME is at: Regridding - v0.3 AMIP runs. /wiki/spaces/ATM/pages/20809870. Based on analysis described on Validation and Benchmarking of Regridders /wiki/spaces/ATM/pages/25231711, NCO and UV-CDAT regridders both satisfy these requirements and are suitable for use. The purpose of this page is to describe how to use these regridders. Regridding occurs in 3 steps: first, files containing the grid for the original and target grids are acquired. Second, these grids are used to create a mapping file is obtained which contains the matrix which, when multiplied by an array of input data for some variable, yields the regridded array for that variable.Third, the "acme regridders" create output on the target grid by combining native-grid data and mapping files. These steps are explained in more detail below.

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See Known locations of inputdata directory for clues to the possible locations of the mapping files on your machine. In a hurry? Many of the most commonly needed ACME mapping files are in the directory ~zender/data/maps at the major DOE compute centers.

Regridding using UV-CDAT:

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Regridding using NCO:

The NCO climo generation script https://github.com/ACME-Climate/PreAndPostProcessingScripts/blob/master/generate_climatologies/climo_nco.shscript ncclimo will automatically regrid climo files (use the -r switch to specify the desired mapfile). See Generating and Regridding Generate, Regrid, and Split Climatologies (climo files) with NCO and ncclimo for instructions and examples.  To regrid other (e.g., non-climo) files, see NCO ncremap instructions. ncremap automates gridfile and mapfile generation (you must have data files on the source and destination grids). Up-to-date versions of NCO are available on Aims4, Cooley, Cori, Edison, Pileus, Rhea, and Yellowstone, usually in ~zender/[bin,lib]. Follow these instructions to build or install NCO on your own. 

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