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More Info For more information on WKT, please see section 6 .2, Well-Known Text Representation
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for Geometry, in the document OpenGIS Implementation Specification for Geographic information Simple feature access Part 1: Common architecture, Version 1 .1 .0 (OGC Reference Number: OGC 05-126) . You can find this document at http://www.opengeospatial.org/standards/sfa .
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Constructing Spatial Objects from Strings and Inserting into a Table
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Now that we have a basic understanding of the spatial object string format (WKT), let s put some data into table t1:
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INSERT INTO t1 VALUES ('Point1', geometry::Parse('POINT(3 4)'));
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Before adding more data, notice that the Parse() method used in the example is not an OGC-required operator (it uses OGC WKT, however) . Additionally, because this method does not provide a way to specify an SRID value, a value of 0 will be assigned to the instance by default . Let s insert another point using a different non-OGC-required method:
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INSERT INTO t1 VALUES ('Point2', geometry::Point(5, 3, 0));
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This constructor does not use WKT, but instead requires the coordinates to be supplied as individual parameters . Note The methods Parse() and Point() are static GEOMETRY methods . Consequently, they require the notation :: instead of dot notation . In addition, the type name appears in lowercase to ensure compatibility with case-sensitive databases . Now, let s put in additional line and area features using OGC-required constructors:
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INSERT INTO t1 VALUES ('Line1', geometry::STLineFromText('LINESTRING(2 2, 5 5)',0)); INSERT INTO t1 VALUES ('Line2', geometry::STGeomFromText('LINESTRING(5 1, 6 1, 6 2, 7 2, 7 3)',0)); INSERT INTO t1 VALUES ('Area1', geometry::STPolyFromText('POLYGON ((1 1, 4 1, 4 5, 1 5, 1 1))',0));
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Up to this point, all spatial objects have been given an SRID value of 0 . Let s insert the next feature with an SRID of 1:
INSERT INTO t1 VALUES ('Area2', geometry::STGeomFromText('POLYGON ((5 4, 5 7, 8 7, 8 4, 5 4))',1));
Now query the table as follows:
SELECT ID, NAME, GEOM FROM t1;
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This returns the following results:
ID NAME GEOM -------------------------------------------------------------------------------1 Point1 0x00000000010C00000000000008400000000000001040 2 Point2 0x00000000010C00000000000014400000000000000840 3 Line1 0x0000000001140000000000000040000000000000004000000000000014400000000000001440 4 Line2 0x000000000104050000000000000000001440000000000000F03F0000000000001840000000 000000F03F000000000000184000000000000000400000000000001C4000000000000000400000000000001C4000 0000000000084001000000010000000001000000FFFFFFFF0000000002 5 Area1 0x00000000010405000000000000000000F03F000000000000F03F000000000000104000000000 0000F03F00000000000010400000000000001440000000000000F03F0000000000001440000000000000F03F0000 00000000F03F01000000020000000001000000FFFFFFFF0000000003 6 Area2 0x0000000001040500000000000000000014400000000000001040000000000000144000000000 00001C4000000000000020400000000000001C400000000000002040000000000000104000000000000014400000 00000000104001000000020000000001000000FFFFFFFF0000000003
Although the ID and NAME attributes are human-readable, GEOM rendered in binary is not . To provide a more useful display of GEOM, we can write the query as:
SELECT ID, NAME, GEOM.STAsText() AS LOCATION FROM t1;
This query produces the following results:
ID -1 2 3 4 5 6 NAME -----Point1 Point2 Line1 Line2 Area1 Area2 LOCATION -----------------------------------POINT (3 4) POINT (5 3) LINESTRING (2 2, 5 5) LINESTRING (5 1, 6 1, 6 2, 7 2, 7 3) POLYGON ((1 1, 4 1, 4 5, 1 5, 1 1)) POLYGON ((5 4, 5 7, 8 7, 8 4, 5 4))
The STAsText() method returns the OGC WKT format of the GEOMETRY values, the same format that we used to specify GEOMETRY values earlier . But it is still difficult to understand the shapes and relative positions of these values . A simple visual representation would be more useful, and Management Studio can provide such a view . First, choose the Results to Grid option in Management Studio . Second, return the spatial column(s) directly, rather than converting them to text . So, let s perform the earlier query selecting the full table:
SELECT ID, NAME, GEOM FROM t1;
Because this query contains a spatial column and Results to Grid was chosen, a Spatial results tab appears . Click the Spatial results tab . You get the display shown in Figure 14-4 . Note several interesting things here . First, note that the following message appears above the visual display: Some spatial objects were not displayed since their SRID is different than the SRID of the first object in the record set. This is caused by the last spatial object the polygon we named Area2 in which we intentionally set the SRID to a value different from the previous rows .
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