[postgis-users] How can i get accurate world coordinate (WGS84)with mouse click?

[Alex Chew]

Hi，Markus
  　Can you read image followed?
All red points are mouse clicked point in Screen Coordinate and green points are in World Coordinate.
I am still got know idea about why this happened. 
X is accurate while Y is error.

Would you please show me the way to a resolution?
Thanks
Alex 　　　　　
　　　　　　　　　　　　　　　
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