Metar.Decoder 1.0.9

Metar.Decoder

A .NET library to decode METAR (Meteorological Aerodrome Report) strings into structured objects.

Compatible with .NET Standard 2.0, .NET 8.0, .NET 10.0, and .NET Framework 4.8.

Quick Start

using Metar.Decoder;
using Metar.Decoder.Entity;

var decoded = MetarDecoder.ParseWithMode("METAR LFPO 231027Z 24004G09KT 2500 +FZRA FEW015 17/10 Q1009");

if (decoded.IsValid)
{
    Console.WriteLine($"ICAO: {decoded.ICAO}");                    // "LFPO"
    Console.WriteLine($"Wind: {decoded.SurfaceWind.MeanSpeed.ActualValue} {decoded.SurfaceWind.MeanSpeed.ActualUnit}");
    Console.WriteLine($"Visibility: {decoded.Visibility.PrevailingVisibility.ActualValue}m");
    Console.WriteLine($"Temperature: {decoded.AirTemperature.ActualValue}C");
    Console.WriteLine($"Pressure: {decoded.Pressure.ActualValue} {decoded.Pressure.ActualUnit}");
}

Features

• Full METAR parsing: Report type, ICAO, datetime, surface wind, visibility, RVR, present weather, clouds, temperature, dew point, pressure, recent weather, windshear, trend, remarks
• Strict and non-strict modes: Continue parsing on errors or stop at first error
• Unit conversion: Built-in conversion between speed, distance, and pressure units
• Null-safe: All optional fields are nullable with safe access patterns
• Cross-platform: Works on Windows, Linux, macOS

Decoded Properties

Unit Conversion

// Convert wind speed to knots
float knots = decoded.SurfaceWind.MeanSpeed.GetConvertedValue(Value.Unit.Knot);

// Convert visibility to feet
float feet = decoded.Visibility.PrevailingVisibility.GetConvertedValue(Value.Unit.Feet);

// Convert pressure to inHg
float inHg = decoded.Pressure.GetConvertedValue(Value.Unit.MercuryInch);

Parsing Modes

// Non-strict (default) - continues on errors
var decoded = MetarDecoder.ParseWithMode(rawMetar);

// Strict - stops at first error
var decoded = MetarDecoder.ParseWithMode(rawMetar, isStrict: true);

// Instance-based with global mode
var decoder = new MetarDecoder();
decoder.SetStrictParsing(true);
var result = decoder.Parse(rawMetar);

Documentation & Source

• Full Documentation: https://github.com/afonsoft/metar-decoder
• Usage Guide: https://github.com/afonsoft/metar-decoder/blob/main/docs/en-US/usage-guide.md
• API Reference: https://github.com/afonsoft/metar-decoder/blob/main/docs/en-US/api-reference.md
• Issues: https://github.com/afonsoft/metar-decoder/issues
• License: MIT