问题描述
在存储通常为以下格式的纬度/经度时:44.087585(即，点和6dp之前最多2个数字)是否需要打扰十进制?
When storing latitudes/longitudes which are typically of the format: 44.087585 (i.e. max 2 numbers before the dot and 6dp) do I need to bother with bigdecimals?
推荐答案
使用double精度足以将纬度/经度降低至英寸，精确到6-7小数位.在航空业中，如果使用小数位，则它们通常至少升至7位小数.在我们的NASA模拟中，纬度/经度数据是双倍的，而所有其他姿态和高度都是浮点的.换句话说，海拔高度的小数点后第六位并不重要，而纬度/经度的小数点后第六位则代表亚英尺精度.如果您需要精确到子英尺的精度，则不应将float用作纬度/经度.
Using double has enough precision for accurate lat/lon down to inches for 6-7 decimal places. In aviation, if decimal degrees are used, they typically go to at least 7 decimal places. In our NASA simulations, lat/lon data are doubles while all other attitude and altitude are floats. In other words, the 6th decimal place for altitude isn't significant while the 6th decimal place for lat/lon is for sub-foot accuracy. You should not use float for lat/lon if you need precision down to sub-feet.
您可以在Google地球中玩耍，通过放置标记并操纵最后一个十进制数字来查看获得的精度.
You can play around in Google Earth to see what accuracy you get by placing markers and manipulating the last decimal digit.
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