STIsEmpty (geography Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
SQL database in Microsoft Fabric
Returns 1 if a geography instance is empty. Returns 0 if a geography instance is not empty.
Syntax
.STIsEmpty ( )
Return Types
SQL Server return type: bit
CLR return type: SqlBoolean
Examples
The following example creates an empty geography instance and uses STIsEmpty() to verify that the instance is empty.
DECLARE @g geography;
SET @g = geography::STGeomFromText('POLYGON EMPTY', 4326);
SELECT @g.STIsEmpty();