1. Spatial Data Types And Indexing SQL Server 2008
Bob King

2. Data Types geometry geography
Planar data
geography
Geodetic data (projection of the curve of the Earth)
Represents points, polygons, regions, etc. in the same data type

3. Common Methods Contains Overlaps Distance Touches Equals Within
Intersects
Union
geometry;
= geometry::STPolyFromText('POLYGON ((5 5, 10 5, 10 10, 5 5))', 0);

4. Indexing the geo* datatypes
Quad-tree based
Successively smaller grid cells

5. Indexing the geo* datatypes
Coverage masks
Touched
Partially Covered
Interior
Map a cell identifier to a primary key
Map sub-cells

6. Searching a geo* index
Select on a cell identifier using prefix matching:
(T.cell LIKE I.cell + ‘%’) OR (I.cell LIKE T.cell + ‘%_’)
Use existing SQL text searching optimizations