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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.
3 November, 2021
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Removing Duplicate Vertices in SQL Server Spatial
This article shows how to remove duplicate vertices/point in SQL Server Spatial geometry objects.
23 October, 2021
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Geometry object size when exchanging of WKT/WKB encoded geometries.
Introduction The ordinates stored in an geometry objects, across all spatial data types do not have any rounding applied to their values. This is one
12 December, 2020
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Geometry Validity and Method Access
Introduction All database spatial types that I have worked with have constructors based on Well Known Text (WKT). When constructing a geometry all those types
6 December, 2020
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Linear Referencing System (LRS) Functions for TSQL
This articles logically steps through all the functions in a complete package of Linear Referencing functions that I have written for TSQL. The article both demonstrates the power of SQL Server Spatial but what can be done with TSQL.
6 December, 2020
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CheckRadii: Identifying Tight Radius Curves sections within LineString geometry data
Sometimes it is a data quality requirement for linear data (roads, pipelines, transmission lines) that curves within the lines must have a radius greater than
30 November, 2020
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Overlaying Polygons in SQL Server Spatial
Introduction The OGC operators for geometry processing only support two polygon inputs. Additionally the Microsoft aggregate operators only include geometry union processing geometry::UnionAggregate and not
25 November, 2020
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Space Filling Curve Functions For TSQL
Introduction Warning: This article is long mainly because it includes the source code of the Hilbert, Morton and Peano key/curves. I would assert that space
22 November, 2020
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Bing Maps Tile System Functions for TSQL
This blog presents functions for Bing Maps Tile System for TSQL. This support includes converting Latitude/Longitude pairs to Bing Maps QuadKeys. The source for the
19 November, 2020
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Geocoding Points Against a Grid of Cells/Tiles With/out Spatial Operators
This article shows how to geocode points objects against grid cells without using spatial operators. The article also shows how to use space curve values such as generated by a Morton key algorithm as grid cell ids and thus geocodes.
19 November, 2020
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