# Spatial Types - geometry (Transact-SQL)

**APPLIES TO:** SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse

The planar spatial data type, **geometry**, is implemented as a common language runtime (CLR) data type in SQL Server. This type represents data in a Euclidean (flat) coordinate system.

SQL Server supports a set of methods for the **geometry** spatial data type. These methods include methods on **geometry** that are defined by the Open Geospatial Consortium (OGC) standard and a set of Microsoft extensions to that standard.

The error tolerance for the geometry methods can be as large as 1.0e-7 * extents. The extents refer to the approximate maximal distance between points of the **geometry**object.

## Registering the geometry Type

The **geometry** type is predefined and available in each database. You can create table columns of type **geometry** and operate on **geometry** data in the same manner as you would use other CLR types. Can be used in persisted and non-persisted computed columns.

## Examples

### A. Showing how to add and query geometry data

The following two examples show how to add and query geometry data. The first example creates a table with an identity column and a `geometry`

column, `GeomCol1`

. A third column renders the `geometry`

column into its Open Geospatial Consortium (OGC) Well-Known Text (WKT) representation, and uses the `STAsText()`

method. Two rows are then inserted: one row contains a `LineString`

instance of `geometry`

, and one row contains a `Polygon`

instance.

```
IF OBJECT_ID ( 'dbo.SpatialTable', 'U' ) IS NOT NULL
DROP TABLE dbo.SpatialTable;
GO
CREATE TABLE SpatialTable
( id int IDENTITY (1,1),
GeomCol1 geometry,
GeomCol2 AS GeomCol1.STAsText() );
GO
INSERT INTO SpatialTable (GeomCol1)
VALUES (geometry::STGeomFromText('LINESTRING (100 100, 20 180, 180 180)', 0));
INSERT INTO SpatialTable (GeomCol1)
VALUES (geometry::STGeomFromText('POLYGON ((0 0, 150 0, 150 150, 0 150, 0 0))', 0));
GO
```

### B. Returning the intersection of two geometry instances

The second example uses the `STIntersection()`

method to return the points where the two previously inserted `geometry`

instances intersect.

```
DECLARE @geom1 geometry;
DECLARE @geom2 geometry;
DECLARE @result geometry;
SELECT @geom1 = GeomCol1 FROM SpatialTable WHERE id = 1;
SELECT @geom2 = GeomCol1 FROM SpatialTable WHERE id = 2;
SELECT @result = @geom1.STIntersection(@geom2);
SELECT @result.STAsText();
```

### C. Using geometry in a computed column

The following example creates a table with a persisted computed column using a **geometry** type.

```
IF OBJECT_ID ( 'dbo.SpatialTable', 'U' ) IS NOT NULL
DROP TABLE dbo.SpatialTable;
GO
CREATE TABLE SpatialTable
(
locationId int IDENTITY(1,1),
location geometry,
deliveryArea as location.STBuffer(10) persisted
)
```

## See Also

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