在PostGIS中查找每个位置点之间的距离

Question

在PostGres数据库中，该列具有带有地理数据类型的“位置”列和另一个“时间”列。时间和位置点存储在很多行中。我想查找每个位置之间的距离。为此，如何在PostGIS中进行查询。

Answer 1

I can't see what relevance the time column has (oh - you're probably better off not using that as a column-name since it's already a type name). There are different ways to calculate distance and if you've not found it yet, I highly recommend the PostGIS documentation:

http://postgis.refractions.net/documentation/