52°North Weather Routing Tool - GSoC 2026 Code Challenge

Student: Aakriti Jha GitHub: aakritithecoder Project: Weather Routing Tool - Improve Test Framework

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What I Did

1. Ran the WRT

Successfully ran the Weather Routing Tool using:

• ALGORITHM_TYPE: genetic
• BOAT_TYPE: direct_power_method

2. Synthetic Weather Data

Created 90 hours of synthetic weather data with all 11 required variables:

• Wind (U/V components)
• Wave height, direction, period (VHM0, VMDR, VTPK)
• Pressure, temperature
• Ocean currents, salinity, water temperature

3. Configuration

Full config.json with genetic algorithm, direct power method, and 7 intermediate waypoints.

4. Unit Tests

Implemented test_routing_problem.py with 11 passing tests across 2 test classes:

TestGetPower (8 tests):

• test_fuel_is_positive
• test_fuel_has_mass_units
• test_fuel_rate_positive_per_segment
• test_speed_matches_input
• test_wind_resistance_non_negative
• test_wave_height_reflects_weather_data
• test_determinism
• test_number_of_segments

TestCrossoverSafetyGuards (3 tests):

• test_two_point_crossover_short_route_returns_parents
• test_single_point_crossover_short_route_returns_parents
• test_two_point_crossover_valid_route_does_not_crash 11 passed in 7.16s

5. Route Output

Generated output/min_fuel_route.json:

• Route: (10.0, 20.0) to (10.7, 20.7)
• Best fuel: 7979.01 kg
• Travel time: ~9.8 hours
• Engine power: 4877.8 kW

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Bugs Fixed During the Process

Bug	Fix
ValueError: low >= high in TwoPointCrossover	Added safety guard for route length
ValueError: low >= high in SinglePointCrossover	Added safety guard
AttributeError: NoneType has no attribute argmin	Added res.F is None check
TypeError: WindowsPath + str	Fixed with str(routepath)
FileNotFoundError on output write	Added os.makedirs

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Files

• config.json - WRT configuration
• generate_90h_weather.py - synthetic weather data generator
• convert_csv_to_nc.py - CSV to NetCDF converter
• test_routing_problem.py - 11 passing unit tests
• min_fuel_route.json - generated route output