Create a geography/geometry column from x and y fields - SQL Server 2008

Question

I'm new in SQL Server 2008 and I hope you will understand my question/need.

Thus, I have a table which contains 3 fields (Name, Lat and Long) in my data base (spatial). I want to create a geometry/geography column based on those fields (Lat and Long) but unfortunately without any success.

My question is: How can I manage to do that?

Answer 1

You can add a computed column like this

alter table yourTable add geographyColumn as geography::STGeomFromText('POINT('+convert(varchar(20),Long)+' '+convert(varchar(20),Lat)+')',4326)

I have add the conversion from lng or lat because I store the Long and Lats as numbers.

Answer 2

Looks like you want the STGeomFromText() or STPointFromText() SQL method:

DECLARE @g geography;
SET @g = geography::STGeomFromText('POINT(-122.34900 47.65100)', 4326);
SELECT @g.ToString();

or

DECLARE @g geography;
SET @g = geography::STPointFromText('POINT(-122.34900 47.65100)', 4326);
SELECT @g.ToString();

Create your Geometry or Geography field, then use SQL to populate that field using your lat/lon values.

Answer 3

SQL Server 2012

You can do it like this,

SELECT geography::Point(lat, long, 4326)

For more information see my post on Database Administrators, "SQL Server Point Constructor or version of ST_Point(x,y)?"

Answer 4

If rounding of the original Long/Lat values occur when using the CONVERT(VARCHAR, statement.

Try using:

GeoData = geometry:: STGeomFromText('POINT(' + CAST(CAST(X AS decimal(13, 2)) AS varchar) + ' '  + CAST(CAST(Y AS decimal(13, 2)) AS varchar) + ')', 4326)