WKT和SVG在坐标系中定义不同的原点。

WKT and SVG define different origins for the coordinate systems.

youdao

注意，SRS 名称和 ID 是任意的，而且是每个数据库本地的，但是底层的坐标系常常是根据行业特权而预定义的。

Note that SRS names and IDs are arbitrary and local to each database, but the underlying coordinate systems are often predefined, with reference to industry authorities.

youdao

然后，在uv坐标系内，把面积元素定义为dA，只是为了让他们看起来不同。

And, the area element in uv coordinates, let me call that dA prime just to make it look different.

youdao