SQL Server supports a number of extended methods on Open Geospatial Consortium (OGC) geography instances.
For more information on OGC specifications, see the following resources:
OGC Specifications, Simple Feature Access Part 1 - Common Architecture
OGC Specifications, Simple Feature Access Part 2 – SQL Options
OGC Specifications, Geography Markup Language
AsBinaryZM (geography Data Type)
AsGml
AsTextZM
BufferWithCurves (geography Data Type)
BufferWithTolerance
CurveToLineWithTolerance (geography Data Type)
EnvelopeAngle
EnvelopeCenter
Filter
HasM (geography Data Type)
HasZ (geography Data Type)
InstanceOf
IsNull
IsValidDetailed (geography Data Type)
Lat
Long
M
MakeValida
MinDbCompatibilityLevel (geography Data Type)
NumRing
Reduce
ReorientObject
RingN
ShortestLineTo (geography Data Type)
ToString
Z
