vgridjs/dist/tilecode.cjs.map

Vgrid DGGS JS

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* Tilecode implementation in TypeScript\r\n * Based on the original Python implementation\r\n * Includes merged mercantile functionality for tile calculations\r\n */\r\n\r\nexport interface Tile {\r\n    x: number;\r\n    y: number;\r\n    z: number;\r\n}\r\n\r\nexport interface Bounds {\r\n    west: number;\r\n    south: number;\r\n    east: number;\r\n    north: number;\r\n}\r\n\r\nconst MAX_ZOOM = 32;\r\nconst MIN_ZOOM = 0;\r\n\r\n/**\r\n * Convert longitude/latitude to tile coordinates\r\n * @param lng Longitude in degrees\r\n * @param lat Latitude in degrees\r\n * @param zoom Zoom level\r\n * @returns Tile coordinates\r\n */\r\nfunction tile(lng: number, lat: number, zoom: number): Tile {\r\n    if (zoom < MIN_ZOOM || zoom > MAX_ZOOM) {\r\n        throw new Error(`Invalid zoom level: ${zoom}`);\r\n    }\r\n\r\n    if (lng < -180 || lng > 180) {\r\n        throw new Error(`Invalid longitude: ${lng}`);\r\n    }\r\n\r\n    if (lat < -90 || lat > 90) {\r\n        throw new Error(`Invalid latitude: ${lat}`);\r\n    }\r\n\r\n    const n = Math.pow(2, zoom);\r\n    const xtile = Math.floor((lng + 180) / 360 * n);\r\n    const ytile = Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * n);\r\n\r\n    return { x: xtile, y: ytile, z: zoom };\r\n}\r\n\r\n/**\r\n * Convert tile coordinates to longitude/latitude bounds\r\n * @param x Tile X coordinate\r\n * @param y Tile Y coordinate\r\n * @param z Zoom level\r\n * @returns Bounds object with west, south, east, north in degrees\r\n */\r\nfunction bounds(x: number, y: number, z: number): Bounds {\r\n    if (z < MIN_ZOOM || z > MAX_ZOOM) {\r\n        throw new Error(`Invalid zoom level: ${z}`);\r\n    }\r\n\r\n    const n = Math.pow(2, z);\r\n    const west = x / n * 360 - 180;\r\n    const east = (x + 1) / n * 360 - 180;\r\n    const north = Math.atan(Math.sinh(Math.PI * (1 - 2 * y / n))) * 180 / Math.PI;\r\n    const south = Math.atan(Math.sinh(Math.PI * (1 - 2 * (y + 1) / n))) * 180 / Math.PI;\r\n\r\n    return { west, south, east, north };\r\n}\r\n\r\n/**\r\n * Convert tile coordinates to quadkey\r\n * @param tile Tile object\r\n * @returns Quadkey string\r\n */\r\nfunction quadkey(tile: Tile): string {\r\n    let quadkey = '';\r\n    for (let i = tile.z; i > 0; i--) {\r\n        let digit = 0;\r\n        const mask = 1 << (i - 1);\r\n        if ((tile.x & mask) !== 0) digit += 1;\r\n        if ((tile.y & mask) !== 0) digit += 2;\r\n        quadkey += digit.toString();\r\n    }\r\n    return quadkey;\r\n}\r\n\r\n/**\r\n * Convert quadkey to tile coordinates\r\n * @param quadkey Quadkey string\r\n * @returns Tile object\r\n */\r\nfunction quadkeyToTile(quadkey: string): Tile {\r\n    let x = 0;\r\n    let y = 0;\r\n    const z = quadkey.length;\r\n\r\n    for (let i = z; i > 0; i--) {\r\n        const mask = 1 << (i - 1);\r\n        const digit = parseInt(quadkey[z - i]);\r\n        if (digit & 1) x |= mask;\r\n        if (digit & 2) y |= mask;\r\n    }\r\n\r\n    return { x, y, z };\r\n}\r\n\r\n/**\r\n * Convert latitude/longitude to tilecode\r\n * @param lat Latitude in degrees\r\n * @param lon Longitude in degrees\r\n * @param zoom Zoom level\r\n * @returns Tilecode string in format 'zXxYyZ'\r\n */\r\nexport function latlon2tilecode(lat: number, lon: number, zoom: number): string {\r\n    const t = tile(lon, lat, zoom);\r\n    return `z${t.z}x${t.x}y${t.y}`;\r\n}\r\n\r\n/**\r\n * Convert latitude/longitude to quadkey\r\n * @param lat Latitude in degrees\r\n * @param lon Longitude in degrees\r\n * @param zoom Zoom level\r\n * @returns Quadkey string\r\n */\r\nexport function latlon2quadkey(lat: number, lon: number, zoom: number): string {\r\n    const t = tile(lon, lat, zoom);\r\n    return quadkey(t);\r\n}\r\n\r\n/**\r\n * Convert quadkey to latitude/longitude\r\n * @param quadkey_id Quadkey string\r\n * @returns [latitude, longitude] in degrees\r\n */\r\nexport function quadkey2latlon(quadkey_id: string): [number, number] {\r\n    const t = quadkeyToTile(quadkey_id);\r\n    const b = bounds(t.x, t.y, t.z);\r\n    const center_lat = (b.south + b.north) / 2;\r\n    const center_lon = (b.west + b.east) / 2;\r\n    return [center_lat, center_lon];\r\n}\r\n\r\n/**\r\n * Convert tilecode to latitude/longitude\r\n * @param tilecode_id Tilecode string in format 'zXxYyZ'\r\n * @returns [latitude, longitude] in degrees\r\n */\r\nexport function tilecode2latlon(tilecode_id: string): [number, number] {\r\n    const match = tilecode_id.match(/z(\\d+)x(\\d+)y(\\d+)/);\r\n    if (!match) throw new Error(\"Invalid tilecode format. Expected format: 'zXxYyZ'\");\r\n    const z = parseInt(match[1]);\r\n    const x = parseInt(match[2]);\r\n    const y = parseInt(match[3]);\r\n    const b = bounds(x, y, z);\r\n    const center_lat = (b.south + b.north) / 2;\r\n    const center_lon = (b.west + b.east) / 2;\r\n    return [center_lat, center_lon];\r\n}\r\n\r\n/**\r\n * Convert tilecode to quadkey\r\n * @param tilecode_id Tilecode string in format 'zXxYyZ'\r\n * @returns Quadkey string\r\n */\r\nexport function tilecode2quadkey(tilecode_id: string): string {\r\n    const match = tilecode_id.match(/z(\\d+)x(\\d+)y(\\d+)/);\r\n    if (!match) throw new Error(\"Invalid tilecode format. Expected format: 'zXxYyZ'\");\r\n    const z = parseInt(match[1]);\r\n    const x = parseInt(match[2]);\r\n    const y = parseInt(match[3]);\r\n    return quadkey({ x, y, z });\r\n}\r\n\r\n/**\r\n * Convert quadkey to tilecode\r\n * @param quadkey_id Quadkey string\r\n * @returns Tilecode string in format 'zXxYyZ'\r\n */\r\nexport function quadkey2tilecode(quadkey_id: string): string {\r\n    const t = quadkeyToTile(quadkey_id);\r\n    return `z${t.z}x${t.x}y${t.y}`;\r\n}\r\n\r\n/**\r\n * Calculate the length of a tile's edge in meters\r\n * @param tilecode_id Tilecode string in format 'zXxYyZ'\r\n * @returns Edge length in meters\r\n */\r\nexport function tilecodeCellLength(tilecode_id: string): number {\r\n    const match = tilecode_id.match(/z(\\d+)x(\\d+)y(\\d+)/);\r\n    if (!match) throw new Error(\"Invalid tilecode format. Expected format: 'zXxYyZ'\");\r\n    const z = parseInt(match[1]);\r\n    const x = parseInt(match[2]);\r\n    const y = parseInt(match[3]);\r\n    const b = bounds(x, y, z);\r\n    \r\n    // Calculate the length of the edge in meters at the equator\r\n    const earthCircumference = 40075016.686; // Earth's circumference in meters\r\n    const tileSize = earthCircumference / Math.pow(2, z);\r\n    \r\n    // Adjust for latitude\r\n    const lat = (b.south + b.north) / 2;\r\n    const adjustedTileSize = tileSize * Math.cos(lat * Math.PI / 180);\r\n    \r\n    return adjustedTileSize;\r\n}\r\n\r\n/**\r\n * Convert tilecode to WKT polygon\r\n * @param tilecode_id Tilecode string in format 'zXxYyZ'\r\n * @returns WKT polygon string\r\n */\r\nexport function tilecode2wktbound(tilecode_id: string): string {\r\n    const match = tilecode_id.match(/z(\\d+)x(\\d+)y(\\d+)/);\r\n    if (!match) throw new Error(\"Invalid tilecode format. Expected format: 'zXxYyZ'\");\r\n    const z = parseInt(match[1]);\r\n    const x = parseInt(match[2]);\r\n    const y = parseInt(match[3]);\r\n    const b = bounds(x, y, z);\r\n    return `POLYGON((${b.west} ${b.south}, ${b.west} ${b.north}, ${b.east} ${b.north}, ${b.east} ${b.south}, ${b.west} ${b.south}))`;\r\n} "]}