Pro Spatial with SQL Server 2012 by Alastair Aitchison

By Alastair Aitchison

Microsoft SQL Server implements vast aid for location-based info. professional Spatial with SQL Server 2012 introduces SQL Server’s spatial characteristic set, and covers every little thing you'll want to know to shop, control, and learn information regarding the actual place of gadgets in area. You’ll find out about the geography and geometry datatypes, and the way to use them in useful events related to the spatial relationships of individuals, areas, and issues on Earth.

Author Alastair Aitchison first introduces you to SQL Server’s spatial function set and the elemental innovations enthusiastic about operating with spatial info, together with spatial references and co-ordinate platforms. You’ll learn how to question, study, and interpret spatial information utilizing instruments resembling Bing Maps and SQL Server Reporting providers. all through, you'll locate worthy code examples so that you can undertake and expand as a foundation to your personal projects.

* Explains spatial techniques from the floor up—no past wisdom is necessary
* presents finished information for each degree of operating with spatial facts, from uploading via detoxification and storing, to querying, and at last for retrieval and exhibit of spatial information in an program layer
* Brilliantly illustrated with code examples that run in SQL Server 2012, that you should adapt and use because the foundation to your personal tasks.

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Microsoft SQL Server implements huge aid for location-based facts. professional Spatial with SQL Server 2012 introduces SQL Server’s spatial characteristic set, and covers every thing you'll want to know to shop, control, and examine information regarding the actual position of items in house.

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Example text

This is the case even when the ends of the LineString are joined together to form a closed loop. LineStrings may be described as having the following additional characteristics. • A simple LineString is one where the path drawn between the points of the LineString does not cross itself. • A closed LineString is one that starts and ends at the same point. • A LineString that is both simple and closed is known as a ring. • The interior of a LineString consists of all the points that lie on the path of the line.

Figure 2-23. A MultiLineString geometry. 44 CHAPTER 2 ■ SPATIAL FEATURES Characteristics of MultiLineStrings Unlike MultiPoints and MultiPolygons, which generally contain elements that are disjoint from each other, MutiLineStrings are frequently comprised of a number of intersecting LineString elements. For example, any road or river that splits into two or more forks cannot be represented by a single LineString geometry, and must instead be represented as a MultiLineString, with each fork being represented by a separate LineString within the MultiLineString.

Defining a CompoundCurve The Well-Known Text for a CompoundCurve geometry begins with the COMPOUNDCURVE keyword followed by a set of round brackets. Contained within the brackets are the individual LineString or CircularString segments that are joined together to form the compound curve. Each CircularString or LineString segment in the CompoundCurve must begin at the point where the previous segment ended, so that the CompoundCurve defines a single continuous path. The coordinates of CircularString segments are preceded by the CIRCULARSTRING keyword, whereas LineString segments are not preceded by any keyword; they are simply a list of coordinates contained in round brackets.

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