proj4 WGS84、UTM坐标系的互相转换

1. 废话不多说 直接上代码

// 1. 获取 UTM带号、CRSCODE
getUTMCRSCode(latitude, longitude) {
    // 计算UTM带号
    let zoneNumber = Math.floor((longitude + 180) / 6) + 1;
    // 确定半球
    let hemisphere = latitude >= 0 ? '326' : '327';

    // 生成UTM CRS代码
    let utmCRSCode = `EPSG:${hemisphere}${String(zoneNumber).padStart(2, '0')}`;

    return { zoneNumber, utmCRSCode };
}

/**
 * 2. WGS84 TO UTM
 * @param latitude  基准点坐标lat
 * @param longitude 基准点坐标lng
 * @param zoneNumber UTM带号
 * @param utmCRSCode CRSCODE
*/
convertToUTM(latitude, longitude, zoneNumber, utmCRSCode) {
   proj4.defs('EPSG:4326', `+proj=longlat +datum=WGS84 +no_defs`);
   proj4.defs(utmCRSCode, `+proj=utm +zone=${zoneNumber} +datum=WGS84 +units=m +no_defs`);
   // 获取UTM
   const [utmX, utmY] = proj4('EPSG:4326', utmCRSCode, [longitude, latitude]);
   return [utmX, utmY];
}

/**
 * 3. UTM TO WGS84
 * @param utmX UTM x方向偏移值
 * @param utmY UTM y方向偏移值
 * @param zoneNumber UTM带号
 * @param utmCRSCode CRSCODE
 */
convertToWGS84(utmX, utmY, zoneNumber, utmCRSCode) {
    proj4.defs(utmCRSCode, `+proj=utm +zone=${zoneNumber} +datum=WGS84 +units=m +no_defs`);
    proj4.defs('EPSG:4326', '+proj=longlat +datum=WGS84 +no_defs');

    const [longitude, latitude] = proj4(utmCRSCode, 'EPSG:4326', [utmX, utmY]);
    return [latitude, longitude];
}