aviconv-met

Bidirectional METAR / SPECI ↔ TAF ↔ SIGMET / AIRMET ↔ VAA / TCA ↔ IWXXM 3.0 converter — part of the aviconv monorepo.

pip install aviconv-met

ICAO mandated IWXXM (XML weather) for OPMET exchange in November 2020. Existing toolchains for it are vendor-locked or one-way. aviconv-met is the pip-installable, MIT-licensed, round-trip alternative.

Public surface

from aviconv_met import (
    Metar, Taf, Sigmet, Airmet, Vaa, Tca,
    parse_metar, format_metar,
    parse_taf, format_taf,
    parse_sigmet, format_sigmet,
    parse_advisory, format_advisory,
)
from aviconv_met.iwxxm import to_iwxxm, from_iwxxm

Frozen pydantic-v2 models for every report type, byte-stable text round-trip for all six message types, and XSD-validated IWXXM 3.0 emission with field-level round-trip on inbound IWXXM.

CLI

Mounted on the umbrella aviconv binary (provided by aviconv-core):

aviconv met parse <file>           # text → JSON
aviconv met format <file>          # JSON → text
aviconv met to-iwxxm <file>        # text → IWXXM 3.0 XML
aviconv met from-iwxxm <file>      # IWXXM XML → JSON or text
aviconv met validate <file>        # run validators

Each subcommand reads from - for stdin and writes stdout unless -o PATH. Exit codes: 0 ok, 1 parse error, 2 validation error, 3 schema error.

Round-trip semantics

  • Text round-trip (METAR/TAF/SIGMET/AIRMET/VAA/TCA): byte-stable — format_*(parse_*(text)) == text whenever the model came from parse_*.
  • IWXXM round-trip: field-level — from_iwxxm(to_iwxxm(report)) == report. GML IDs and namespace prefix choices are intentionally not preserved.

Licence

MIT for aviconv-met itself. Bundled WMO IWXXM 3.0 schemas are distributed under WMO open-data terms — see LICENSES/README.md.

Project links

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Credits

Author: aviconv contributors

GitHub Statistics

Data verified by PyPI on Aug 8, 2026
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License

MIT License (MIT)

Requires

Python >=3.11

Tags

airmet aviation icao iwxxm metar opmet sigmet taf tca vaa wmo

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