vgridjs/dist/maidenhead.cjs.map

Vgrid DGGS JS

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* Maidenhead grid system implementation in TypeScript\r\n * Converts between latitude/longitude and Maidenhead grid locators\r\n */\r\n\r\nconst MAIDENHEAD_FIELD = 'ABCDEFGHIJKLMNOPQRSTUVWX';\r\nconst MAIDENHEAD_SQUARE = '0123456789ABCDEFGHIJKLMNOPQRSTUVWX';\r\nconst MAIDENHEAD_SUBSQUARE = 'abcdefghijklmnopqrstuvwx';\r\n\r\nexport class MaidenheadException extends Error {\r\n    constructor(message: string) {\r\n        super(message);\r\n        this.name = 'MaidenheadException';\r\n    }\r\n}\r\n\r\n/**\r\n * Converts latitude and longitude to a Maidenhead grid locator\r\n * @param lat Latitude in degrees (-90 to 90)\r\n * @param lon Longitude in degrees (-180 to 180)\r\n * @param precision Precision level (1-3)\r\n * @returns Maidenhead grid locator string\r\n */\r\nexport function encode(lat: number, lon: number, precision: number = 2): string {\r\n    if (lat < -90 || lat > 90) {\r\n        throw new MaidenheadException('Latitude must be between -90 and 90 degrees');\r\n    }\r\n    if (lon < -180 || lon > 180) {\r\n        throw new MaidenheadException('Longitude must be between -180 and 180 degrees');\r\n    }\r\n    if (precision < 1 || precision > 3) {\r\n        throw new MaidenheadException('Precision must be between 1 and 3');\r\n    }\r\n\r\n    // Normalize coordinates\r\n    lon = (lon + 180) % 360;\r\n    lat = (lat + 90) % 180;\r\n\r\n    let locator = '';\r\n\r\n    // Field (first two characters)\r\n    const fieldLon = Math.floor(lon / 20);\r\n    const fieldLat = Math.floor(lat / 10);\r\n    locator += MAIDENHEAD_FIELD[fieldLon];\r\n    locator += MAIDENHEAD_FIELD[fieldLat];\r\n\r\n    if (precision >= 2) {\r\n        // Square (next two characters)\r\n        const squareLon = Math.floor((lon % 20) / 2);\r\n        const squareLat = Math.floor((lat % 10) / 1);\r\n        locator += MAIDENHEAD_SQUARE[squareLon];\r\n        locator += MAIDENHEAD_SQUARE[squareLat];\r\n\r\n        if (precision >= 3) {\r\n            // Subsquare (next two characters)\r\n            const subsquareLon = Math.floor((lon % 2) * 12);\r\n            const subsquareLat = Math.floor((lat % 1) * 24);\r\n            locator += MAIDENHEAD_SUBSQUARE[subsquareLon];\r\n            locator += MAIDENHEAD_SUBSQUARE[subsquareLat];\r\n        }\r\n    }\r\n\r\n    return locator;\r\n}\r\n\r\n/**\r\n * Converts a Maidenhead grid locator to latitude and longitude\r\n * @param locator Maidenhead grid locator string\r\n * @returns [latitude, longitude] in degrees\r\n */\r\nexport function decode(locator: string): [number, number] {\r\n    if (!locator) {\r\n        throw new MaidenheadException('Empty locator string');\r\n    }\r\n\r\n    locator = locator.toUpperCase();\r\n    const len = locator.length;\r\n\r\n    if (len < 2 || len > 6 || len % 2 !== 0) {\r\n        throw new MaidenheadException('Invalid locator length');\r\n    }\r\n\r\n    // Field\r\n    const fieldLon = MAIDENHEAD_FIELD.indexOf(locator[0]);\r\n    const fieldLat = MAIDENHEAD_FIELD.indexOf(locator[1]);\r\n\r\n    if (fieldLon === -1 || fieldLat === -1) {\r\n        throw new MaidenheadException('Invalid field characters');\r\n    }\r\n\r\n    let lon = fieldLon * 20 - 180;\r\n    let lat = fieldLat * 10 - 90;\r\n\r\n    if (len >= 4) {\r\n        // Square\r\n        const squareLon = MAIDENHEAD_SQUARE.indexOf(locator[2]);\r\n        const squareLat = MAIDENHEAD_SQUARE.indexOf(locator[3]);\r\n\r\n        if (squareLon === -1 || squareLat === -1) {\r\n            throw new MaidenheadException('Invalid square characters');\r\n        }\r\n\r\n        lon += squareLon * 2;\r\n        lat += squareLat * 1;\r\n\r\n        if (len >= 6) {\r\n            // Subsquare\r\n            const subsquareLon = MAIDENHEAD_SUBSQUARE.indexOf(locator[4].toLowerCase());\r\n            const subsquareLat = MAIDENHEAD_SUBSQUARE.indexOf(locator[5].toLowerCase());\r\n\r\n            if (subsquareLon === -1 || subsquareLat === -1) {\r\n                throw new MaidenheadException('Invalid subsquare characters');\r\n            }\r\n\r\n            lon += subsquareLon / 12;\r\n            lat += subsquareLat / 24;\r\n        }\r\n    }\r\n\r\n    return [lat, lon];\r\n}\r\n\r\n/**\r\n * Vgrid specific function to get cell boundaries\r\n * @param maidenheadId Maidenhead grid locator\r\n * @returns [centerLat, centerLon, minLat, minLon, maxLat, maxLon, precision]\r\n */\r\nexport function maidenheadCell(maidenheadId: string): [number, number, number, number, number, number, number] {\r\n    const [centerLat, centerLon] = decode(maidenheadId);\r\n    const precision = Math.floor(maidenheadId.length / 2);\r\n    \r\n    let gridSize: number;\r\n    switch (precision) {\r\n        case 1:\r\n            gridSize = 10; // Field size\r\n            break;\r\n        case 2:\r\n            gridSize = 1;  // Square size\r\n            break;\r\n        case 3:\r\n            gridSize = 1/24; // Subsquare size\r\n            break;\r\n        default:\r\n            throw new MaidenheadException(`Invalid precision: ${precision}`);\r\n    }\r\n\r\n    const minLon = Math.floor(centerLon / gridSize) * gridSize;\r\n    const maxLon = minLon + gridSize;\r\n    const minLat = Math.floor(centerLat / gridSize) * gridSize;\r\n    const maxLat = minLat + gridSize;\r\n\r\n    return [centerLat, centerLon, minLat, minLon, maxLat, maxLon, precision];\r\n} "]}