位置坐标、纬度和经度的长度是多少? [英] What are the lengths of Location Coordinates, latitude and longitude?
问题描述
纬度和经度可以有多少位数字，小数点前和小数点后?
How many digits can latitude and longitude have, before the decimal, and after the decimal?
以下是我从 Windows Phone 设备发送的位置获取的示例:
Here is an example I am getting from the location sent by a Windows Phone device:
Latitude=-63572375290155
Longitude=106744840359415
这很长，超出了我的表列大小并导致错误.
This is very long and is exceeding my table column size and causes errors.
推荐答案
如果纬度坐标报告为 -6.3572375290155 或 -63.572375290155 十进制度数，那么您可以四舍五入并存储 10 厘米(或0.1 米)精度.如果坐标参考系统 (CRS) 不是 EPSG:4326(例如 EPSG:3857)，则 x 和 y 值测量的是距原点的距离(以米为单位，而不是以度为单位).
If the latitude coordinate is reported as -6.3572375290155 or -63.572375290155 in decimal degrees then you could round-off and store up to 6 decimal places for 10 cm (or 0.1 meters) precision. If the coordinate reference system (CRS) is not EPSG:4326 (e.g., EPSG:3857) then the x and y values measure a distance in meters from the origin point rather than in degrees.
以度为单位的有效纬度范围分别为南半球和北半球的-90 和+90.经度在 -180 和 +180 范围内，分别指定本初子午线以西和以东的坐标.作为参考，赤道的纬度为 0°，北极 的纬度为北纬 90°(写为 90° N 或 +90°)，南极的纬度为-90°.
The valid range of latitude in degrees is -90 and +90 for the southern and northern hemisphere, respectively. Longitude is in the range -180 and +180 specifying coordinates west and east of the Prime Meridian, respectively. For reference, the Equator has a latitude of 0°, the North pole has a latitude of 90° north (written 90° N or +90°), and the South pole has a latitude of -90°.
本初子午线的经度为 0°，穿过英格兰格林威治.国际日期变更线 (IDL) 大致遵循 180° 经度.正值经度在东半球，负值在西半球.
The Prime Meridian has a longitude of 0° that goes through Greenwich, England. The International Date Line (IDL) roughly follows the 180° longitude. A longitude with a positive value falls in the eastern hemisphere and the negative value falls in the western hemisphere.
六 (6) 位小数 使用十进制度数表示法的坐标精度为 10 厘米(或 0.1 米)分辨率.坐标十进制度数的每个 .000001 差异的长度约为 10 厘米.例如，谷歌地球和谷歌地图的图像分辨率通常为 1 米，有些地方的分辨率更高，为每像素 1 英寸.一米分辨率可以使用 5 个小数位来表示，因此超过 6 个小数位对于该分辨率来说是多余的.赤道的经度间距与纬度相同，但经度间距在极点为零，子午线在该点汇合.
Six (6) decimal places precision in coordinates using decimal degrees notation is at a 10 cm (or 0.1 meters) resolution. Each .000001 difference in coordinate decimal degree is approximately 10 cm in length. For example, the imagery of Google Earth and Google Maps is typically at the 1-meter resolution, and some places have a higher resolution of 1 inch per pixel. One meter resolution can be represented using 5 decimal places so more than 6 decimal places are extraneous for that resolution. The distance between longitudes at the equator is the same as latitude, but the distance between longitudes reaches zero at the poles as the lines of meridian converge at that point.
对于毫米 (mm) 精度，则以十进制度数格式表示具有 8 个小数位的纬度/经度.由于大多数应用程序不需要这种精度级别，因此大多数情况下 6 位小数就足够了.
For millimeter (mm) precision then represent lat/lon with 8 decimal places in decimal degrees format. Since most applications don't need that level of precision 6 decimal places is sufficient for most cases.
在另一个方向上，十进制度数表示约 111 公里(或 60 海里)的距离，十进制度数差异表示约 11 公里的距离.
In the other direction, whole decimal degrees represent a distance of ~111 km (or 60 nautical miles) and a 0.1 decimal degree difference represents a ~11 km distance.
这里是一个表，其中包含 # 个小数点后的纬度差异，以及以 0,0 为起点的估计距离(以米为单位).
Here is a table of # decimal places difference in latitude with the delta degrees and the estimated distance in meters using 0,0 as the starting point.
| 小数位 | 十进制度 | 距离(米) | |
|---|---|---|---|
| 0 | 1.0 | 110,574.3 | 111 公里 |
| 1 | 0.1 | 11,057.43 | 11 公里 |
| 2 | 0.01 | 1,105.74 | 1 公里 |
| 3 | 0.001 | 110.57 | |
| 4 | 0.0001 | 11.06 | |
| 5 | 0.00001 | 1.11 | |
| 6 | 0.000001 | 0.11 | 11 厘米 |
| 7 | 0.0000001 | 0.01 | 1 厘米 |
| 8 | 0.00000001 | 0.001 | 1 毫米 |
度-分-秒 (DMS) 表示
对于 DMS 表示法，1 弧秒 = 1/60/60 度 = ~30 米长，0.1 弧秒增量为 ~3 米.
Degrees-minute-second (DMS) representation
For DMS notation 1 arc second = 1/60/60 degree = ~30 meter length and 0.1 arc sec delta is ~3 meters.
示例:
0° 0' 0"W, 0° 0' 0"N⟹0° 0' 0"W, 0° 0' 1"N⟹ 30.715 米0° 0' 0"W, 0° 0' 0"N⟹0° 0' 0"W, 0° 0' 0.1"N⟹ 3.0715 米
0° 0' 0" W, 0° 0' 0" N⟹0° 0' 0" W, 0° 0' 1" N⟹ 30.715 meters0° 0' 0" W, 0° 0' 0" N⟹0° 0' 0" W, 0° 0' 0.1" N⟹ 3.0715 meters
1 弧分 = 1/60 度 = ~2000 米(2 公里)
1 arc minute = 1/60 degree = ~2000m (2km)
这里是关于坐标精度的有趣漫画.
Here is an amusing comic strip about coordinate precision.
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