google-earth-plugin - Plugin Placemark snap to location grid size too large

Question

When trying to add a placemark to the plugin via the API. The place mark positions itself to an invisible grid that seems to be about a metre square.

My application needs accuracy to 10cm, does anyone know how to stop the place mark snapping to a grid and positioning at the mouse pointer location exactly???

Answer 1

你能举一个地标的例子吗？没有看到很难说，但我猜你可能使用 5 个小数位定义它的坐标。这将解释“似乎大约一平方米的隐形网格”。

我的应用程序需要精确到 10 厘米

Google 地球和地图 API 使用精确到小数点后六位的坐标。这提供了赤道周围约 11 厘米的精度。离赤道越远，误差越大。所以你不能精确到10厘米，赤道纬度最多只能是11厘米。

您可以使用下表粗略了解坐标中的小数位数与地球上的精度之间的关系。同样，距离赤道越远，精度就会下降。

Accuracy of decimal coordinates at the equator

0   1.0         111 km
1   0.1         11.1 km
2   0.01        1.11 km
3   0.001       111 m
4   0.0001      11.1 m
5   0.00001     1.11 m  * (What I think you are using now.)
6   0.000001    0.111 m * (The highest accuracy possible in the api.)
7   0.0000001   1.11 cm
8   0.00000001  1.11 mm