百度地圖、Google地圖的縮放比例
阿新 • • 發佈：2019-02-15
1、百度
/// <summary> 通過縮放級別獲取百度地圖的縮放比例。 /// </summary> public static double GetScale(int zoom) { switch (zoom) { case 1: return 131072; case 2: return 65536; case 3: return 32768; case 4: return 16384; case 5: return 8192; case 6: return 4096; case 7: return 2048; case 8: return 1024; case 9: return 512; case 10: return 256; case 11: return 128; case 12: return 64; case 13: return 32; case 14: return 16; case 15: return 8; case 16: return 4; case 17: return 2; case 18: return 1; } return 1; }
2、谷歌
/// <summary> 通過縮放級別獲取Google地圖的縮放比例。 /// </summary> public static double GetScale(int zoom) { #region Google map (in meters/pixel) 的比例值。scale =π R / (256 * 2^(z-1)),π = 3.1415926536, R = 6378137(地球半徑)。 switch (zoom) { case 0: return 156543.03392; case 1: return 78271.51696; case 2: return 39135.75848; case 3: return 19567.87924; case 4: return 9783.93962; case 5: return 4891.96981; case 6: return 2445.98490; case 7: return 1222.99245; case 8: return 611.49622; case 9: return 305.74811; case 10: return 152.87405; case 11: return 76.43702; case 12: return 38.21851; case 13: return 19.10925; case 14: return 9.55462; case 15: return 4.77731; case 16: return 2.38865; case 17: return 1.19432; case 18: return 0.59716; case 19: return 0.29858; default: return 19.10925;//預設的話按13算 } #endregion }