SQL Server 2017 supports the static geometry methods of the Open Geospatial Consortium (OGC).
For more information on Open Geospatial Consortium (OGC) specifications, see the following Open Geospatial Consortium Specifications:
OGC Specifications, Simple Feature Access Part 1 - Common Architecture
OGC Specifications, Simple Feature Access Part 2 – SQL Options
OGC Methods on Geometry Instances
Extended Methods on Geometry Instances
Extended Static Geometry Methods