位置坐标的长度，纬度和经度是多少? [英] What are the lengths of Location Coordinates, latitude and longitude?
问题描述
经度和纬度在小数点前和小数点后可以有几位数?
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，超出了我的表列的大小，并导致错误.
This is very long and is exceeding my table column size and causes errors.
推荐答案
如果纬度坐标以十进制度数报告为-6.3572375290155或-63.572375290155，那么您可以四舍五入并存储10厘米的小数点后6位(或0.1米)的精度.
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.
南半球和北半球的有效纬度范围分别为 -90和+90 .经度在 -180和+180 范围内，分别指定本初子午线以西和东经.
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°.
Prime Meridian 的经度为0°，经过英格兰格林威治.国际日期变更线(IDL)大致遵循180度经度.东半球为正值的经度，西半球为负值的经度.
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)个小数位，使用十进制度数表示法的坐标精度为10厘米(或0.1米).坐标十进制度的每个.000001差异长度约为10厘米.例如，"Google地球"和"Google地图"的图像通常为1米的分辨率，有些地方的分辨率为每像素1英寸.一米的分辨率可以使用5个小数位表示，因此该分辨率不需要6个小数位.赤道上的经度距离与纬度相同，但是当子午线在该点收敛时，经度之间的距离在极点处达到零.
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，则以十进制度数形式表示经度/纬度，带小数点后8位.由于大多数应用程序不需要这种精度水平，所以在大多数情况下，小数点后6位就足够了.
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，整个十进制度表示的距离约为111公里(或60海里)，而十进制度差的0.1表示距离约为11公里.
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.
这是一张#纬度差异小数位数的表，其中以度数和以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 | 十进制度数 | 距离(米) | |
|---|---|---|---|
| 1 | 0.10000000 | 11,057.43 | 11公里 |
| 2 | 0.01000000 | 1,105.74 | 1公里 |
| 3 | 0.00100000 | 110.57 | |
| 4 | 0.00010000 | 11.06 | |
| 5 | 0.00001000 | 1.11 | |
| 6 | 0.00000100 | 0.11 | 11厘米 |
| 7 | 0.00000010 | 0.01 | 1厘米 |
| 8 | 0.00000001 | 0.001 | 1毫米 |
度-分-秒(DMS)表示形式
对于DMS表示法，1弧秒= 1/60/60度=约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=〜2000m(2km)
1 arc minute = 1/60 degree = ~2000m (2km)
此处是有关坐标精度的有趣漫画.
Here is an amusing comic strip about coordinate precision.
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