android - 如何在 Android 上为谷歌地图获取 E6 格式的经度纬度

Question

我如何找出某个位置的经纬度的SPECIFIC E6 值。例如，我在谷歌上搜索了巴拉圭首都亚松森的 long-lat。它返回我:

巴拉圭亚松森的纬度和经度是 25°16' S, 57°40 W

现在我如何将这种 long-lat 格式转换为 android 理解的 long-lat 的 E6 格式？ E6 到底是什么东西？

[附注我还用谷歌搜索了亚松森的 E6 long-lat.......没有运气]

Answer 1

所以这是一个两步过程 - thanks to hooked82's answer

---

第 1 步. 从 DMS 到十进制度数的转换 From Wikipedia

Given a DMS (Degrees, Minutes, Seconds) coordinate such as 87°43′41″ W, it's trivial to convert it to a number of decimal degrees using the following methods:

Total number of degrees
= 87

Total number of seconds
= 43′41″ = (43*60 + 41*1) = 2621 seconds.

The fractional part is total number of seconds divided by 3600
= 2621 / 3600 = 0.728056

Add fractional degrees to the whole degrees to produce the final result
= 87 + 0.728056 = 87.728056.

Since it is a West longitude coordinate, negate the result.
= -87.728056.

经纬度引用:

Lat.  North = +
Lat.  South = -
Long. East  = +
Long. West  = -

---

第 2 步。从十进制转换为微度(E6 格式) From SO discussion

MicroDegrees (the E6 format) = DecimalDegrees * 1e6
--- as mentioned in AndroidDevGuide as well

因此，

float lat   = -23.4456f;   //in DecimalDegrees
float lng   = 45.44334f;   //in DecimalDegrees
GeoPoint gp = new GeoPoint((int)(lat * 1E6), (int)(lng * 1E6));