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Why can't a feature class be created using the SQL Server geography spatial type with a projected coordinate system?
The Microsoft SQL Server geography spatial type is a geodetic type that uses latitude/longitude measurements; it does not support projected coordinate systems.
Therefore, when creating a feature class using the SQL Server geography spatial type and a projected coordinate system, an error message similar to one of the following will be returned:
Data stored in the SQL Server geography type must use one of the spatial reference systems defined in SQL Server. To see a list of supported spatial reference systems, query the SQL Server sys.spatial_reference_systems catalog view.