Sql Saturday Spatial Data Ss2008 Michael Stark Copy

SQL SERVER 2008Spatial Geography

Implemented in ASP.net and Virtual Earth

Michael StarkStarkNetwork.com

[email protected]

[email protected]

SQL Saturday Tampa FloridaJanuary 23, 2010

OutlineThis session is …a quick tour of the spatial features of SQL Server 2008.

This session is NOT …

An in-depth study of the spatial features of SQL Server 2008

An in-depth explanation of ListView Control

An in-depth explanation of Virtual Earth

Background Overview Spatial in SQL 2008 Creating a spatial Query in

SSMS Spatial Query in ListView

control Spatial Query wired up to

Virtual Earth 21 Other ideas for mapping Implementation Issues

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OverviewTyler’s Article

SQL Server Magazine

SQLMAG.com

Instant Doc ID 100528

Tyler Chessman's article in SQL Server Magazine's December 2008 issue is my primary source of information to implement my spatial solutions. Visit sqlmag.com and search for instant doc ID 100528. I have a link on my blog to the article.

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OverviewWhat is Spatial Data?

Example of Spatial Data

SQL Server’s answer

Spatial data represents the shape and physical location of an object.

The object can be a house, business, sub-division, or a county.

SQL Server 2008 has two new data types GEOMETRY and GEOGRAPHY.

GEOMETRY works with flat objects. GEOGRAPHY considers the shape

of the earth.

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GEOMETRYGEOGRAPHYCLR Data Types

No need to enable CLR

Many Methods

Open Geospatial Consortium

GEOGRAPHY and GEOMETRY are CLR data types.

You do not need to have CLR enabled on the SQL Server instance.

Microsoft has provided a long list of OGC methods.

These are methods that are part of the independent Open Geospatial Consortium list of specifications.

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OGC MethodsOGC Open Geospatial Consortium

SQL Server 2008 supports the Open Geospatial Consortium (OGC) methods on geometry instances.

These methods make it very easy to perform geospatial tasks that were once very difficult.

STArea STAsText STBoundary STBuffer STCentroid STContains STConvexHull STCrosses STDifference

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STDimension STDisJoint STDistance STEndPoint STEnvelope STEquals STExteriorRing STGeometryN STGeometryType

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STInteriorRing STIntersection STIntersects STIsClosed STIsEmpty STIsRing STIsSimple STIsValid STLength

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STNumGeometries STNumInteriorRing STNumPoints STOverlaps STPointN STPointOnSurface STIsSimple STRelate STSrid

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STStartPoint STSymDifference STTouches STUnion STWithin STX STY

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DEMONSTRATIONList of functions to demonstrate

I will demonstrate STGeomFromText STDistance AsGML STasText STGeometryType STNumPoints. The demonstration will

return a list of stores within a provided distance of a given point.

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STDistance

STDistance( Point , SRID )

The STDistance function requires an argument of the SQLgeometrytype

Convert the latitude and longitude to SQLgeometrytype.

Declare a variable of the geography type.

Set the variable to geography::STGeomFromText('point(lon lat)',4326).

Notice that the point is a string. Notice there is no comma between

lat and lon 4326 is an SRID and is used to tell

the function what method to use to calculate distance on a not-so-round planet.

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SQL Statement Declare @CodeGEOG geography =

geography::STGeomFromText('Point(-95.3410 29.7070)',4326);Select top(5) addr.AddressID as id ,addr.addressline1,addr.city,addr.SpatialLocation, -- Will show the raw dataaddr.SpatialLocation.AsGml() as SpationalGML,addr.SpatialLocation.STAsText() as SpatialText,addr.SpatialLocation.STGeometryType() as GeoType,addr.SpatialLocation.STNumPoints() as Points,addr.SpatialLocation.STDistance(@CodeGEOG) as distance_in_meters,addr.SpatialLocation.STDistance(@CodeGEOG)/1609.344 as

distance_in_milesfrom dbo.Address addr Whereaddr.SpatialLocation.STDistance(@CodeGEOG)/1609.344 < 50 order by distance_in_miles

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SSMSA demonstration of running a spatial query

DEMO

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Into ActionA very quick run through

Wire-up Spatial Query to List View Control Virtual Earth

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List View Control

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Virtual Earth

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21 WaysO’Brien lists 20 wayshttp://maps.live.comhttp://dev.live.com/virtualearthhttp://blogs.msdn.com/VirtualEarth3D/And more

I add one more way – Weather .com

John O'Brien of the GEOWebGuru.com has compiled a list of 20 ways to use VirtualEarth. See it here http://www.geowebguru.com/articles/86-twenty-ways-to-use-the-virtual-earth-platform-as-a-developer-

Visit Weather.com to see this flash and VirtualEarth in actionhttp://www.weather.com/weather/map/interactive/33626?from=36hr_topnav_undeclared

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ImplementationIssues

VE Implementation works fine in development

Returns File Not Found when deployed to IIS

You will find that the VE and Handler implementation returns a File Not Found Error when deployed to a web server.

In IIS6 you right click on your App, go to properties, click Virtual Directory Tab, Configuration, Mapping Tab, Add, point the Executable to c:\windows\microsoft.net\framework\v2.0.50727\aspnet_isapi.dll and add the appropriate Extension ("georss") .

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ConclusionThis session was …a quick tour of the spatial features of SQL Server 2008.

This session was NOT …An in-depth study of the spatial features of SQL Server 2008An in-depth explanation of ListView ControlAn in-depth explanation of Virtual Earth

Background Overview Spatial in SQL 2008 Creating a spatial Query in

SSMS Spatial Query in ListView

control Spatial Query wired up to

Virtual Earth 21 Ways to implement VE Deployment Issues

SQL SERVER 2008Spatial Geography

Implemented in ASP.net and Virtual Earth

Michael StarkStarkNetwork.com

[email protected]://blog.starknetwork.com

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Sql Saturday Spatial Data Ss2008 Michael Stark Copy