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Current SQL Server Blog Articles

    STGeometryTypes: Extracting all geometry type string values from complex geometry
    STDensify: Densify (m)LineString or (m)Polygon geometry objects
    STInsertN: Insert single vertex into a geometry
    STUpdateN: Update (replace) a single vertex within a geometry object.
    STUpdate: Replace all points equal to the supplied point with replacement point.
    STDeleteN: Delete single vertex from geometry
    STDelete: Deleting vertices in geometry objects
    STFlipVectors: Normalize direction of linestring vectors
    STConvertToLineString: Extract LineStrings in GeometryCollection to create LineString
    STLine2Cogo: Converting LineStrings to COGO XML
    STCogo2Line: Creating (Multi)LineStrings geometries from COGO XML instructions
    STVectorize: Break Linestring/Polygon elements into 2 point vectors (or 3 point circular curves)
    STScale: Function to Scale a geometry object
    TSQL String Tokenizer Function for SQL Server
    STGeometry2MBR/STGeography2MBR: Compute and return MBR ordinates
    generate_series for SQL Server 2008
    STExtractPolygon: Extract Polygons from result of STIntersection in SQL Server Spatial
    STRound: Function to round ordinates of a SQL Server Spatial geometry object
    STExtract: Extract elements of a geometry object
    STNumRings: Counting number of polygon rings
    STFilterRings: Removing rings from Polygon based on area.
    STMove: Function to Move a geometry object in SQL Server Spatial
    STCentroid*: Alternate Functions for Compute a Centroid
    STRotate: Function to rotate a geometry object in SQL Server Spatial
    STVertices: Wrapper over STDumpPoints
    STMorton: Creating a Morton number Space Key value for grid square
    Gridding a geometry or geography object (SQL Server Denali)
    On hinting spatial indexes
    RandomSearchByExtent: Random Search Procedure (2008 Spatial)
    COGO: Convert DMS String to decimal degrees floating point number.
    COGO: Converting (Google Earth) Formatted Longitude/Latitude points to decimal degrees (SQL Server)
    COGO: Convert Degrees, Minutes and Seconds values to Decimal Degrees
    COGO: DD2DMS Formatting a latitude/longitude decimal degree value
    COGO: Create point from bearing and distance
    COGO: Compute number of vertices required to stroke circle or circular arc
    COGO: Calculating the bearing between two points (SQL Server 2008 Spatial)
    COGO: Compute arc length subtended by angle centre of circle
    COGO: Compute chord length of segment of a circle (arc)
    COGO: Computing Arc To Chord (Arc2Chord) Separation
    COGO: Creating a stroked polygon from a circle's centre x,y and radius
    COGO: Finding centre and radius of a curve defined by three points: FindCircle function
    CheckRadii: Identifying Tight Radius Curves sections within LineString geometry data
    Generating random point data for SQL Server 2008 Spatial
    New Presentation on Active (Searchable) Spatial Metadata for SQL Server 2008 Spatial and FreeText
    STisGeo: Checking if a column in a table or a view is of type geometry or geography
    Vectorising geometry objects in SQL Server 2008
    STMBR2Geometry/STMBR2Geography functions
    Extracting geometry types from geometry/geography objects in SQL Server 2008
    Getting the number of coordinate dimensions of a geometry/geography object in SQL Server 2008
    STDumpPoints: A Function that Dumps the Vertices/Points in a geometry
    toGeography and toGeography Conversion Functions for SQL Server 2008 Spatial
    Write text file with spatial data from SQL Server 2008
    Loading Shapefiles into Geography type column in SQL Server 2008
    Tip #6: Correcting invalid geometries
    Tip #5: Where or where has my little column gone
    Tip #4: What Coordinate System is that?
    Tip #3: What object is that?
    Tip #2: Spatial Indexing and Primary Keys
    Tip #1: SQL Server 2008 "Katmai" - Setting SRIDs

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All Blog Articles, Data Models and Free Source Code by Simon Greener, The SpatialDB Advisor is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

Tip #1: SQL Server 2008 "Katmai" - Setting SRIDs

Saturday November 24 2007 at 01:31

Using FME 2008 Beta I loaded a shapefile containing Local Government Areas in Tasmania into SQL Server 2008 “Katmai”. The shapefile didn’t have a .PRJ and I forgot to set the SRID in FME.

So, without reloading the shapefile how can I change the SRID?

Firstly, open the Microsoft SQL Server Management Studio, open the database and click on the “New Query” button.

To see what the loaded SRID was I can do this:

select distinct a.geom.STSrid 
  from dbo.TAS_LGA a;

The returned result is 0.

Now to set a SRID of 28355 is dead easy. Use the same property method STSrid in an update statement:

update dbo.tas_lga set geom.STSrid = 28355;

Note that in SQL Server all references to OGC 1.1 functions and operators are case-sensitive so make sure you type STSrid and not STSRID. Also since the SRID is a property of the object we don’t need round brackets on the property ie STSrid() would be incorrect.

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Comment [2]

Hey Simon – this will be a cool blog.

I was able to use Manifold to export 4 million area objects into SQLServer 2008 Express. Took about 20 minutes – not bad.

Early in the beta, there were some problems with the SRID (as you can see from the Manifold release notes), now, Manifold handles the coordinate information very nicely. I’ve done it with a number of different projects without problem.

On Monday I’ll post more information on the results of some spatial operations with large data.

artlembo 24 November 2007, 03:06 #

Art,

I use a combination of FME 2008 beta (no indexing in current beta build) and Manifold GIS. I concur that Manifold GIS can read/write to SQL Server 2008 very well; I expect the reading of VLDBs in Manifold GIS should, at the next release, finally be dynamic and not limited to manual setting of Areas of Interest.

I too have been playing around with some SQL-based geoprocessing using buffers and STIntersection(), I await with interest your posting as you know more about spatial SQL than I do.

regards
SImon

Simon 24 November 2007, 04:42 #