如何将纬度/经度对转换为 PostGIS 地理类型？
我正在尝试将一堆纬度/经度对加载到 PostGIS 地理类型中，以便能够按位置查询。
特别是，我有一个带有浮动纬度和经度列以及地理（Point，4326）列的表。我想做
update mytable set geography = ???
文档似乎建议以下操作应该有效：
update mytable set geography = ST_GeogFromText('POINT(' || latitude || ' ' ||
longitude || ')');
它不起作用。我不知道它对这一点的解释是什么，但它只允许经度位于-90到90之间，所以它显然不是经度。
那么，我该怎么办？
I'm trying to load a bunch of latitude/longitude pairs into a PostGIS geography type so as to be able to query by location.
In particular I have a table with float latitude and longitude columns and a geography(Point, 4326) column. I would like to do
update mytable set geography = ???
The documentation appears to suggest that the following should work:
update mytable set geography = ST_GeogFromText('POINT(' || latitude || ' ' ||
longitude || ')');
It doesn't. I don't know what it's interpreting this point as meaning, but it only allows the longitude to lie between -90 and 90, so it's clearly not a longitude.
So, what do I do?
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评论（3）
...叹。我的愚蠢。显然正确的顺序是经度、纬度。我误以为两个坐标具有相同的范围（-180 到 180），因此认为发生了更微妙的事情。
...sigh. Stupidity on my part. Apparently the correct order is longitude, latitude. I was fooled into thinking that both coordinates had the same range (-180 to 180) so thought something more subtle was going on.
以下是创建地理类型的一些不同方法：
将数字
long和lat列转换为geog地理类型：转换
geom几何列 (< a href="http://epsg.io/4326" rel="noreferrer">SRID=4326) 使用简单的转换转换为geog地理类型：将投影的 geom 几何列转换为 geog 地理类型：
请注意，最后两个示例适用于任何几何类型。此外，从几何到地理的转换通常是隐式的，并且这些示例无需
::geography即可工作，但是显式转换通常是这些事情的良好实践。Here are some different ways to make geography types:
Convert numeric
longandlatcolumns to ageoggeography type:Convert a
geomgeometry column (SRID=4326) to ageoggeography type using a simple cast:Transform a projected
geomgeometry column to ageoggeography type:Note that the last two examples work on any geometry type. Also, the conversion from geometry to geography is often implicit, and these examples work without
::geography, however explicit casts are usually a good practice for these things.要执行 lat 和 lng 之间的交换，您可以使用：
带或不带 srid。
To perform exchange between lat and lng you may use:
with or without srid.