SHO Weather Generator

Description

• PHP script that produces quasi-realistic weather scenarios from real weather data
• Uses real weather data from OpenWeatherMap.org in sqlite databases
• Produces weather scenarios based on probabilities derived from real weather data metrics
• Supports weather parameters like Conditions (Sunny, Cloudy, Overcast, Rainy, Storm), Ambient Temperature, Track Temperature, and Track On/Off Path Initial Wetness
• Outputs real-time and slots-based weather scenarios generated from templates
• Fast and scalable:
  • A single weather scenario can be generated in less than 100ms covering 7 distinct weather sessions and each containing up to 24 hours worth of weather progression.
  • On an i7 2600 32GB RAM with SSDs, it takes:
    • 3-5min to generate realtime and 10/15/20/30/60/120min slots weather for ~100 tracks x 12 months x 10 weather scenarios
    • 9-26min for ~ x 100 weather scenarios
    • 1-5h for ~ x 1000 weather scenarios
    • The ranges are because some weather file types take longer than others. 120min slots are the fastest with least bytes generated, 10min slots take longer, and realtime is slowest with most most bytes generated.
    • For example, in the 1000 weather scenarios case, you would only need 1h for slots and it takes 4 more hours to complete the realtime files
    • Benchmarks:
      • 2024-11-25 125 Locations: 10ct - 3m58s | 100ct - 19m55s | 1000ct - XXhXXm
      • 2024-11-05 115 Locations: 10ct - 3m40s | 100ct - 19m03s | 1000ct - 3h24m
      • Added xargs location-parallelization for realtime (slots might benefit from the same change but already has parallelization by slot length)
  • 8.8 Million files generated for the 1000 weather scenarios variation
  • The algorithm could be extracted, ported, and put inside another program to enable seamless weather scenarios in-game
    • For example, maybe one day the algorithm is included as a DLL with the Crew Chief GTR2 Enhancements Plugin which transparently and seamlessly generates a weather scenario when you load into a track

Related:

• Data consumed: Racing Circuits Real Weather Data
• Generated weather files used by Crew Chief GTR2 Enhancements Plugin Custom Weather to power real weather scenarios in GTR2
• Release notes: Crew Chief GTR2 Enhancements Plugin Custom Weather

Download

• 2024-11-26: Download (751 KB)
• 2024-11-08: Download (748 KB)
• 2024-11-06: Download (747 KB)
• 2024-10-06: Download (744 KB)

Discussion

Click here to discuss

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Getting Started

• See README.txt in the download

Sim Support

• Supported:
  • GTR2 Weather File Format (ie. UserData\Log\weather.txt)
• Future:
  • Since output files are generated from templates, the code could be updated to support other file formats
  • The algorithm and data could be included in other software directly

What does SHO stand for?

SHO is the first three letters of my username (Shovas) but also happens to be an acronym used by Ford, which stands for "Super High Output", so I feel it's an appropriately fun acronym for a sim racing mod :)

License

SHO Weather Generator © 2024 by Shovas is licensed under Creative Commons Attribution-NonCommercial 4.0 International. This license requires that users give credit to the creator. It allows users to distribute, remix, adapt, and build upon the material in any medium or format, for noncommercial purposes only.

View the full license here: http://creativecommons.org/licenses/by-nc/4.0/

You don't have to ask permission for legitimate uses. You just have to give credit.

I think this provides clarity and is a nice compromise that maintains modding freedom while protecting the people that made them from losing credit to their work and against people who would cut out authors from profit from copying it.

Contact

User:Shovas