LonLatConvert.js 3.5 KB

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  1. //转换常数
  2. const x_pi = 3.14159265358979324 * 3000.0 / 180.0
  3. const pi = 3.14159265358979324
  4. const a = 6378245.0
  5. const ee = 0.00669342162296594323
  6. function transformLon(x, y) {
  7. var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  8. ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  9. ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
  10. ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
  11. return ret;
  12. }
  13. function transformLat(x, y) {
  14. var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
  15. ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  16. ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
  17. ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
  18. return ret;
  19. }
  20. // 判断是否在国内
  21. function outOfChina(lat, lon) {
  22. if (lon < 72.004 || lon > 137.8347)
  23. return true;
  24. if (lat < 0.8293 || lat > 55.8271)
  25. return true;
  26. return false;
  27. }
  28. /*
  29. WGS-84转换GCJ-02
  30. (即 天地图转高德、腾讯地图)
  31. */
  32. export const wgs_gcj_encrypts = (latlon) => {
  33. var dLat = transformLat(latlon.lng - 105.0, latlon.lat - 35.0);
  34. var dLon = transformLon(latlon.lng - 105.0, latlon.lat - 35.0);
  35. var radLat = latlon.lat / 180.0 * pi;
  36. var magic = Math.sin(radLat);
  37. magic = 1 - ee * magic * magic;
  38. var sqrtMagic = Math.sqrt(magic);
  39. dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
  40. dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
  41. var lat = latlon.lat + dLat;
  42. var lng = latlon.lng + dLon;
  43. return {lng , lat}
  44. }
  45. /*
  46. BD-09转换GCJ-02
  47. (即 百度转高德、腾讯地图)
  48. */
  49. export const bd_google_encrypt = (latlons) => {
  50. var point = [];
  51. for (const latlon of latlons) {
  52. var x = latlon.lng - 0.0065;
  53. var y = latlon.lat - 0.006;
  54. var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
  55. var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
  56. var gg_lon = z * Math.cos(theta);
  57. var gg_lat = z * Math.sin(theta);
  58. point.push({
  59. lat: gg_lon,
  60. lng: gg_lat
  61. })
  62. }
  63. return point;
  64. }
  65. /*
  66. GCJ-02转换BD-09
  67. (即 高德、腾讯转百度地图)
  68. */
  69. export const google_bd_encrypt = (latlons) => {
  70. var point = [];
  71. for (const latlon of latlons) {
  72. var x = latlon.lng;
  73. var y = latlon.lat;
  74. var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
  75. var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
  76. var bd_lon = z * Math.cos(theta) + 0.0065;
  77. var bd_lat = z * Math.sin(theta) + 0.006;
  78. point.push({
  79. lat: bd_lat,
  80. lng: bd_lon
  81. })
  82. }
  83. return point;
  84. }
  85. /*
  86. GCJ-02 到 WGS-84 的转换
  87. (即 高德、腾讯转天地图)
  88. */
  89. export const gcj_wgs_encrypts = (latlons) => {
  90. var point = [];
  91. for (const latlon of latlons) {
  92. if (outOfChina(latlon.lat, latlon.lng)) {
  93. point.push({
  94. lat: latlon.lat,
  95. lng: latlon.lng
  96. })
  97. return point;
  98. }
  99. var dLat = transformLat(latlon.lng - 105.0, latlon.lat - 35.0);
  100. var dLon = transformLon(latlon.lng - 105.0, latlon.lat - 35.0);
  101. var radLat = latlon.lat / 180.0 * pi;
  102. var magic = Math.sin(radLat);
  103. magic = 1 - ee * magic * magic;
  104. var sqrtMagic = Math.sqrt(magic);
  105. dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
  106. dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
  107. var lat = dLat;
  108. var lng = dLon;
  109. point.push({
  110. lat: lat,
  111. lng: lng
  112. })
  113. }
  114. return point;
  115. }