EnvelopeAggregate (geography Data Type)
Returns a bounding object for a given set of geography objects. The resulting geography object contains multiple circular arc segments.
|Applies to: SQL Server (SQL Server 2012 through current version), Azure SQL Database.|
EnvelopeAggregate ( geography_operand )
Is a geography type table column that holds the set of geography objects on which to perform an envelope aggregate operation.
SQL Server return type: geography
A FullGlobe object is returned when the resulting bounding object is bigger than a hemisphere. This method is not precise.
Method returns null if the input has different SRIDs. See Spatial Reference Identifiers (SRIDs).
Method ignores null inputs.
The following example performs a
EnvelopeAggregate on a set of geography location points within a city.
geography::EnvelopeAggregate(SpatialLocation) AS SpatialLocation
WHERE PostalCode LIKE('981%')
GROUP BY City;