I've just started playing with the Geo spatial data types in SQL Server 2008 R2 Express.
The first thing I wanted to do was draw a circle. How difficult could it be?
I could not find an example on the interweb - so I put one together.
Now choose the 'Spatial Results' tab - you might have never seen this before. It only appears if the results set has a geospatial data type in it.
The observant of you might notice, it's not actually a circle. Just 360 different point (there is a different!) But I'll cover that in my next blog post.
[UPDATED: Added link to scripts]
All scripts can be found on my SkyDrive using the link below.
The first thing I wanted to do was draw a circle. How difficult could it be?
I could not find an example on the interweb - so I put one together.
1: DECLARE @Points AS FLOAT = 360;
2:
3: DECLARE @count AS INT = 0;
4:
5: DECLARE @size AS INT = 1;
6:
7: DECLARE @tmpTable TABLE (
8: geo geometry);
9:
10: WHILE (@count < @Points)
11: BEGIN
12: INSERT INTO @tmpTable
13: SELECT geometry::STGeomFromText('POINT(' + CAST (SIN(RADIANS((CAST (@count AS FLOAT) / CAST (@Points AS FLOAT)) * @Points)) * @size AS VARCHAR) + ' ' + CAST (COS(RADIANS((CAST (@count AS FLOAT) / CAST (@Points AS FLOAT)) * @Points)) * @size AS VARCHAR) + ')', 4326) AS Posn;
14: SET @count = @count + 1;
15: END
16:
17: SELECT geo
18: FROM @tmpTable;
Now choose the 'Spatial Results' tab - you might have never seen this before. It only appears if the results set has a geospatial data type in it.
The observant of you might notice, it's not actually a circle. Just 360 different point (there is a different!) But I'll cover that in my next blog post.
[UPDATED: Added link to scripts]
All scripts can be found on my SkyDrive using the link below.
No comments:
Post a Comment