modverif 0.2.2

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modverif

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Documentation: https://mullenkamp.github.io/modverif/

Source Code: https://github.com/mullenkamp/modverif

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A Python package for evaluating multidimensional model output, following MET/METplus standards for meteorological verification. All data I/O uses the cfdb format.

Features

Grid-to-Grid Evaluation (Evaluator)

Compare two gridded model runs (e.g., WRF outputs):

• Cell-level metrics: NE, ANE, RSE, Bias, MAE, POD, FAR, CSI, GSS, Frequency Bias
• Domain-aggregated metrics: NE, ANE, RMSE, Bias, Pearson correlation, POD, FAR, CSI, GSS, Frequency Bias
• Fractions Skill Score (FSS): Multi-scale spatial verification for precipitation and other threshold-based fields
• Vector wind metrics: Vector RMSE, wind speed bias, wind direction bias from U/V components
• Diurnal cycle analysis: Metrics grouped by hour-of-day
• Spatial subsetting: Bounding box or 2D boolean mask
• Time filtering: Start/end time bounds

Grid-to-Point Evaluation (StationEvaluator)

Compare gridded model output to weather station observations:

• Automatic grid-to-point interpolation via cfdb's GridInterp.to_points()
• Per-station, per-timestep metrics: Bias, MAE, NE, ANE
• Per-station aggregated metrics: RMSE, Pearson correlation
• Station-aggregated summary statistics
• Height level matching (single-level and multi-level observations)
• Vector wind evaluation at station locations
• Diurnal cycle analysis per station

Cyclone Evaluation

Track cyclones independently in two datasets and compare:

• Cyclone tracking via SLP pressure minimum
• Track position, pressure, and radius differences
• Per-variable metrics within the cyclone region

Verification Plots

Publication-quality plots following MET/METplus conventions:

• Scatter plot: Model vs observed with 1:1 line, statistics box, density option
• Station map: Geographic map of station metric values (cartopy optional)
• Time series: Model/observation comparison over time
• Performance diagram: POD vs Success Ratio with CSI contours and bias lines (Roebber 2009)
• Taylor diagram: Standard deviation, correlation, and centered RMSE (Taylor 2001)
• Diurnal cycle: Hour-of-day metric comparison
• FSS scale plot: Skill vs neighborhood size
• Wind rose comparison: Side-by-side model/observed wind roses

Quick Start

from modverif import Evaluator, StationEvaluator

# Grid-to-grid evaluation
evaluator = Evaluator('source.cfdb', 'test.cfdb')
evaluator.evaluate_domain('output.cfdb', variables=['air_temperature'], metrics=['bias', 'rmse', 'pearson'])

# Grid-to-point evaluation
station_eval = StationEvaluator(
    'model.cfdb', 'stations.cfdb',
    variable_heights={'air_temperature': 2.0, 'wind_speed': 10.0},
)
station_eval.evaluate('station_output.cfdb', variables=['air_temperature'], metrics=['bias', 'rmse'])

# FSS evaluation
evaluator.evaluate_fss('fss_output.cfdb', variables=['precipitation'], threshold=1.0)

# Vector wind evaluation
evaluator.evaluate_wind('wind_output.cfdb', metrics=['vector_rmse', 'speed_bias'])

Convenience functions are also available:

from modverif.evaluate import (
    evaluate_models_cell,
    evaluate_models_domain,
    evaluate_stations,
    evaluate_fss,
    evaluate_wind,
)

Plotting

from modverif.plots import plot_scatter, plot_station_map, plot_performance_diagram

plot_scatter(model_values, obs_values, save_path='scatter.png', variable_name='Temperature', units='K')
plot_station_map(lons, lats, bias_values, save_path='map.png', metric_name='Bias')
plot_performance_diagram([0.85, 0.72], [0.15, 0.28], labels=['WRF-A', 'WRF-B'])

Installation

pip install modverif

Or with UV:

uv add modverif

Dependencies

• Python >= 3.10
• cfdb, numpy, scipy, matplotlib, pyproj
• cartopy (optional, for geographic map projections)

License

This project is licensed under the terms of the Apache Software License 2.0.