geometry 转 grography_geometry expressions_photography水印写法

after looking through web and Postgis in action book I still don't get 4326 geometry vs geography idea.

As I understand geometry is a projection of a map to a suce, and geography is 3d representation (WGS86 Model).

If both of them are 4326, what are benefits of using one over the other and what would be such cases.

I know that geometry is having more functions , and as they state , those functions can be much faster than geography, but then what is use for geography model if you can use 4326 geometry ?

Edit: When I speak about geometry, I only mean 4326 , not other ones.

本文来自电脑杂谈，转载请注明本文网址：
https://www.pc-fly.com/a/jisuanjixue/article-48354-1.html