I'm trying to UPDATE a Geography field in an SQL Server 2012 database using the output of a web mapper. I got the dreaded "The specified input does not represent a valid geography instance because it exceeds a single hemisphere," error when running the command. I found that by reversing the order of the vertices the UPDATE command works as expected.

I see that SQL Server 2012 includes a ReorientObject() method that does this task, but I don't know how to incorporate it into my SQL UPDATE command. The following returns the same "single hemisphere" error.

UPDATE tblProjects
SET tblProjects.Boundary = geography::STGeomFromText( 'POLYGON ((-93.30388806760311 27.994401411046173, -94.62224744260311 33.37641235124676, -79.70281384885311 31.80289258670676, -93.30388806760311 27.994401411046173))',4326).ReorientObject()
WHERE tblProjects.ProjectID = 1 ;
  • I'd love to learn how to incorporate ReorientObject() on a simple select. Commented Nov 1, 2019 at 20:06

1 Answer 1


This should update your column:

UPDATE yourtable SET column = column.MakeValid().ReorientObject();

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