October 2008
Beginner to intermediate
1024 pages
31h 30m
English
Content preview from Programming Microsoft® SQL Server™ 2008
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Defining Space with Well-Known Text
Shapes are projected onto spatial models using vector objects—which are collections of points, lines, and polygons (closed shapes). Both the geometry and geography data types support the same Well-Known Text (WKT) markup language, which is a convention that expresses the vector objects that you define using a syntax governed by the OGC.
Table 9-1 shows some examples of WKT strings.
Table 9-1. examples of WKT Strings
WKT String | Description |
|---|---|
POINT(6 10) | A single point at xy-coordinates 6, 10 |
POINT(-111.06687 45.01188) | A single point on the earth (longitude/latitude coordinates) |
LINESTRING(3 4,10 50,20 25) | A two-part line, drawn between three points specified as xy-coordinates |
POLYGON(( -75.17031 39.95601, -75.16786 ... |
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