ESMF_6_1_0/ESMF_6_1_1 Regridding: Supported Grids and Features

This page describes the current support and testing status of the capabilities of the parallel regridding functionality provided by ESMF. (It includes a brief description of the capabilities, but see the Regrid Section in the ESMF reference manual for a more in depth description of ESMF regridding.) Regridding, also called remapping or interpolation, is the process of changing the grid that underlies data values while preserving qualities of the original data. Different kinds of transformations are appropriate for different problems. Regridding may be needed when communicating data between Earth system model components such as land and atmosphere, or between different data sets to support operations such as visualization.

Regridding can be broken into two stages. The first stage is generation of an interpolation weight matrix that describes how points in the source grid contribute to points in the destination grid. The second stage is the multiplication of values on the source grid by the interpolation weight matrix to produce values on the destination grid. This occurs through a parallel sparse matrix multiply. ESMF can be run so that only interpolation weights are generated, or so that weights are both generated and applied, or so that weights that come from some external source can be read in and applied.

Regridding Options

Options for running ESMF

Options for coordinate systems

Description of grid types

Options for regridding methods

Support of regridding methods by grid type

Options for poles, areas, masking, and unmapped points