import { FlightRules, ICAO } from './index.js';
/**
 * Represents a METAR (Meteorological Aerodrome Report) station.
 *
 * @interface MetarStation
 * @property {ICAO} station - The ICAO identifier for the METAR station.
 * @property {Metar} metar - The METAR data associated with the station.
 * @property {GeoJSON.Position} coords - The geographical coordinates of the station.
 */
export interface MetarStation {
    station: ICAO;
    metar: Metar;
    coords: GeoJSON.Position;
}
/**
 * Represents a distance measurement.
 *
 * @interface Distance
 * @property {number} value - The numerical value of the distance.
 * @property {'m'|'sm'} unit - The unit of measurement, either meters ('m') or statute miles ('sm').
 */
export interface Distance {
    value: number;
    unit: 'm' | 'sm';
}
/**
 * Represents atmospheric pressure information.
 *
 * @interface Pressure
 * @property {number} value - The numeric value of the pressure measurement
 * @property {'hPa' | 'inHg'} unit - The unit of measurement for pressure, either hectopascals (hPa) or inches of mercury (inHg)
 */
interface Pressure {
    value: number;
    unit: 'hPa' | 'inHg';
}
/**
 * Represents cloud information.
 *
 * @interface Cloud
 * @property {'SKC' | 'FEW' | 'BKN' | 'SCT' | 'OVC' | 'NSC'} quantity - The cloud coverage quantity.
 * @property {number} [height] - The height of the cloud layer in feet (optional).
 */
export interface Cloud {
    quantity: 'SKC' | 'FEW' | 'BKN' | 'SCT' | 'OVC' | 'NSC';
    height?: number;
}
/**
 * Represents wind conditions.
 *
 * @interface Wind
 * @property {number} direction - The direction of the wind in degrees (0-359).
 * @property {number} [directionMin] - The minimum wind direction in degrees (optional).
 * @property {number} [directionMax] - The maximum wind direction in degrees (optional).
 * @property {number} speed - The speed of the wind in knots.
 * @property {number} [gust] - The gust speed in knots (optional).
 */
export interface Wind {
    direction: number;
    directionMin?: number;
    directionMax?: number;
    speed: number;
    gust?: number;
}
/**
 * Creates a Metar object from a raw METAR string.
 *
 * @param raw The raw METAR string
 * @returns A Metar object
 */
export declare function createMetarFromString(raw: string): Metar;
/**
 * Interface representing METAR (Meteorological Terminal Aviation Routine Weather Report) data.
 *
 * Contains parsed weather data from a METAR report, including station identification,
 * observation time, flight rules category, and various weather parameters.
 *
 * @interface Metar
 * @property {string} station - The ICAO code of the reporting station
 * @property {Date} observationTime - The date and time when the observation was made
 * @property {string} raw - The raw METAR text string
 * @property {number} [windDirection] - Wind direction in degrees
 * @property {number} [windDirectionMin] - Minimum wind direction in degrees (for variable wind direction)
 * @property {number} [windDirectionMax] - Maximum wind direction in degrees (for variable wind direction)
 * @property {number} [windSpeed] - Wind speed in the units used in the METAR (typically knots)
 * @property {number} [windGust] - Wind gust speed in the same units as windSpeed
 * @property {number} [temperature] - Temperature in degrees Celsius
 * @property {number} [dewpoint] - Dewpoint temperature in degrees Celsius
 * @property {number} [visibility] - Visibility in statute miles or meters (depends on country)
 * @property {number} [qnh] - Barometric pressure (QNH) in hPa or inHg (depends on country)
 * @property {Cloud[]} [clouds] - Array of cloud layers, each with a quantity and optional height
 */
export interface Metar {
    station: string;
    observationTime: Date;
    raw: string;
    wind: Wind;
    temperature?: number;
    dewpoint?: number;
    visibility?: Distance;
    qnh?: Pressure;
    clouds?: Cloud[];
}
export declare function metarCeiling(metar: Metar): number | undefined;
export declare function metarFlightRule(metar: Metar): FlightRules;
export declare function isMetarExpired(metar: Metar, options?: {
    customMinutes?: number;
    useStandardRules?: boolean;
}): boolean;
export type MetarFlightRuleColor = 'green' | 'blue' | 'red' | 'purple' | 'black';
export declare function metarFlightRuleColor(metarData: Metar): MetarFlightRuleColor;
export type MetarColorCode = 'green' | 'blue' | 'yellow' | 'amber' | 'red';
export declare function metarColorCode(metarData: Metar): MetarColorCode;
export {};