在Django中使用哪个模型字段存储经度和纬度值？ [英] Which Model Field to use in Django to store longitude and latitude values?

问题描述

我想使用经度和纬度存储用户位置，目前这是来自Google地图，但是我将使用GeoDango和一些点来计算点与点之间的距离。

I want to store my users location using longitude and latitude, at the moment this comes from Google Maps, but I will be using GeoDango and some point to work out distances between to points also.

但是，我的第一个困惑是应该使用Django中的哪个字段存储经度和纬度值？我收到的信息有冲突。

However, my first confusion is which field in Django I should be using to store the longitude and latitude values? The information I'm getting is conflicting.

官方文档使用 FloatField
https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/#geographic-models

lon = models.FloatField()
lat = models.FloatField()

几乎所有关于stackoverflow的答案都显示 DecimalField

Where almost every answer on stackoverflow shows a DecimalField

long = models.DecimalField(max_digits=8, decimal_places=3)
lat = models.DecimalField(max_digits=8, decimal_places=3)

那我应该用什么？

推荐答案

浮点数通常是一个近似值，请参见此处的一些简单示例。将模型修改为 DecimalField（max_digits = 9，decimal_places = 6）可能会得到很好的结果，因为小数在坐标中非常重要，但基本上使用6以上毫无意义。

Float is generally an approximation, see here for some simple examples. You could get very nice results modifying your model to something like DecimalField(max_digits=9, decimal_places=6), since decimals are very important in coordinates but using more than 6 is basically meaningless.

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