Fixing Geography Ring Orientation
This article demonstrates the effect wrong ring orientation has on the processing of a geography object and shows how to fix such orientation.
Simon Greener
Calculating Distance in the Lambert Conformal Conic projection vs WGS84/GDA94
This article shows how scale is affected when calculating distances along the Lambert Conformal Conic Projection by comparing distances computed on the projection against those calculated along a geographic projection.
Killer Data
Back in 2005 I wrote two article on LiDAR. These articles are: Killer Data – Part 1 Killer Data – Part 2 Enjoy.
Delaunay Triangulation Function for TSQL and SQL Server Spatial
This article shows how to create a delaunay triangulation (mesh) from various inputs in SQL Server Spatial, and compute the 3D (slope) area.
Creating linestring geometries from a table of ordinates (SQL Server)
This article shows how to create linestring and mutlilinestring SQL Server geometry objects from a from table of ordinates.
Creating linestring geometries from a table of ordinates (Oracle)
Introduction (This article is about Oracle Spatial.) It is quite a common thing to have ordinates held as separate columns within a table as in the following CTE example. How does one create linestrings and multilinestrings from this data? First things first: A linestring A linestring can be created by serialising the separate x, yRead More
Partition Spatial Data using SQL Server
In this article a quad tree tesselation is used to define how to partition a table of based on its spatial data (geographic points) in SQL Server. The recursive spatial partitioning uses the spatial content to influence each grid cell size.
Removing Spikes in SQL Server Spatial Linestrings
This article presents a method for identifying and removing spikes in SQL Server Spatial linestrings and polygon rings. Spikes are common when processing GPS observations.
qGIS, GEOMETRY_COLUMNS and SQL Server Spatial
This article recommends using the GEOMETRY_COLUMNS metadata table to control access to feature tables and their geometry properties for qGIS.
Removing Duplicate Vertices in SQL Server Spatial
This article shows how to remove duplicate vertices/point in SQL Server Spatial geometry objects.