To query by distance, you must use a projected coordinate system.

要按照距离进行查询，必须使用投影坐标系。

youdao

If any of these assumptions are not valid for your database, you have to make adjustments that vary from trivial (for column names) to somewhat involved (in the case of a projected coordinate system).

如果这些假设对于您的数据库不成立，那么必须做某些调整，这些调整可能很简单(比如对于列名)，也可能比较复杂(比如对于投影坐标系)。

youdao

If any of these assumptions are not valid for your database, you have to make adjustments that vary from trivial (for column names) to somewhat involved (in the case of a projected coordinate system).

如果这些假设对于您的数据库不成立，那么必须做某些调整，这些调整可能很简单(比如对于列名)，也可能比较复杂(比如对于投影坐标系)。

youdao