Current SQL Server Blog Articles
• Function to Scale a geometry object for SQL Server Spatial
• TSQL String Tokenizer Function for SQL Server
• geography/geometry to MBR helper functions
• generate_series for SQL Server 2008
• Extract Polygons from result of STIntersection in SQL Server Spatial
• Function to round ordinates of a SQL Server Spatial geometry object
• Extract elements of SQL Server Spatial geometry object
• Counting number of polygon rings SQL Server Spatial
• Filtering Polygon Rings in SQL Server Spatial
• Function to Move a geometry object in SQL Server Spatial
• Alternate Centroid Functions for SQL Server Spatial
• Function to Rotate geometry objects in SQL Server Spatial
• A GetVertices wrapper for DumpPoints in SQL Server 2008 Spatial
• Creating a Morton number Space Key generator for SQL Server
• Gridding a geometry or geography object (SQL Server Denali)
• On hinting spatial indexes
• Random Search Procedure (SQL Server 2008 Spatial)
• 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
• 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
• Checking is a column in a table or a view is of type geometry or geography
• Extracting geometry type string values from geometry/geography objects in SQL Server 2008 Spatial
• Vectorising geometry objects in SQL Server 2008
• MBR to geography/geometry helper 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
• A Dump Points Function for SQL Server 2008 Spatial
• 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
A common question that comes up in the various database forums (PostGIS, SQL Server, Oracle) is how to “grid” a linear or polygonal object.
By “grid” one means work out the square pixels (rectangular polygons) that cover or define a vector geometry.
Here is some SQL for doing this for SQL Server 2008 Denali. Denali has spatial aggregates built in which is why it was used for this blog article. It can be done for SQL Server 2008 R1 and R2 but it needs the Codeplex extensions to be installed and enabled.
The gridding method requires two functions Morton and REGULARGRIDXY. THe Morton key function is provided in another blog article.
The other required function, REGULARGRIDXY ensures that the gridding takes place according to a commonly defined MBR so that the grids generated across multiple geometries align. This function is provided here:
Here is the gridding method for a single geometry.
The result of this looks like.
For multiple geometries, the following needs to be executed.
That looks like this.
I hope this is of use to SQL Server Denali users