ICON Grid Generator

Pure Python generation of deterministic ICON-style triangular grids.

Global ICON grid resolutions

The package provides spherical R<n>B<k> grids, planar triangular grids, limited-area extraction, geometry diagnostics and transforms, xarray conversion, and ICON-compatible NetCDF export. Large global grids use export-first generation with bounded derived-field memory and resumable disk checkpoints.

Installation

The base package requires Python 3.10 or newer and NumPy:

python -m pip install icon-grid-generator

Install acceleration and common output integrations for high-resolution work:

python -m pip install "icon-grid-generator[accelerate,netcdf,xarray]"

Numba acceleration is optional for in-memory grids and required for the high-resolution export-first path.

Quick Start

Generate an in-memory grid and write the complete NetCDF schema:

from grid_generator import generate_grid

grid = generate_grid("R2B4")
print(grid.name, grid.dims)
grid.to_netcdf("icon_grid_R02B04.nc")

Generate a large global grid directly to NetCDF:

from grid_generator import generate_grid_to_netcdf

generate_grid_to_netcdf(
    "R2B12",
    "icon_grid_R02B12.nc",
    options={"max_cells": None, "accelerator": "numba"},
    work_dir="icon-grid-R2B12-work",
    fields="reduced",
)

The default full profile contains 85 fields. reduced contains the 46-field union required by the standard ICON and icon4py global-grid readers. Dedicated icon and icon4py profiles and exact custom field lists are also available. Place large outputs and checkpoint directories on disk-backed storage. Each checkpoint manifest atomically selects a complete array snapshot, so an interrupted overwrite leaves the preceding completed checkpoint resumable.

Performance

Measurements used an exclusive dual-socket AMD EPYC 7713 node with 128 physical cores and about 446 GiB of available memory. Times cover independent generation and uncompressed NetCDF export; shared-filesystem I/O varies with storage load.

R2B12 output	Generation	NetCDF export	Total	Peak RSS	Checkpoints	NetCDF
Full	43.51 min	91.24 min	134.74 min	328.18 GiB	162.46 GiB	1,047.50 GiB
Reduced	42.03 min	42.05 min	84.08 min	328.18 GiB	162.46 GiB	485.00 GiB

See Performance and Scaling for R2B8–R2B12 measurements, component timings, validation details, and all field-profile storage sizes.

Documentation

Citation metadata is provided in CITATION.cff. The package is distributed under the BSD 3-Clause License.

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