问题
When I apply STBuffer(1) to a Point in SQL Server Spatial, they show up as an oblong circle, instead of a perfect circle. Why is this?
回答1:
The selected projection is Equirectangular, and not the more familiar Mercator that we see in Google Maps & Bing Maps. Change this and the points will show up as expected.
More information about map projection here: http://en.wikipedia.org/wiki/Map_projection
来源：https://stackoverflow.com/questions/19693067/why-are-my-buffered-points-oblong-and-not-circle-in-sql-server-management-studio