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R based Delaunay Triangulation Function for PostGIS using the deldir package
This article shows how to create and use an r-based Delaunay triangulation function for postgis using a XYZ supporting version of the deldir package.
31 July, 2020
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COGO: Converting Decimal Degrees to Degrees Minutes and Seconds – and back again (PostGIS)
It is useful to have functions for converting from individual degrees, minutes and seconds to a single decimal degree value and back again. Here are
27 July, 2020
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COGO: Finding centre and radius of a curve defined by three points (PostGIS)
Recently I had need to convert a PL/SQL Oracle Spatial function I created years ago called FindCircle to SQL Server 2008 for use in another
27 July, 2020
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Gridding a geometry object (PostGIS)
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
24 July, 2020
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ST_Parallel for PostGIS
Many people have asked me to convert my Oracle Parallel function to PostGIS. I did it a year or so ago but the results were
17 July, 2020
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Morton Key Function for PostgreSQL/PostGIS
In my article on the creation and use of a space keys for the spatial sorting of spatial data, I show how to implement a
10 July, 2020
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Implementing Point-based Costs in pgRouting
Implementing Point-based Costs in pgRouting pgRouting is a great tool but it does have certain limitations. One limitation is that one cannot have costs at
17 June, 2020
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Spatially Extending Database Management and Development Tools: GeoRaptor, DBeaver, pgAdmin and SSMS
“Imitation is the Greatest Form of Flattery” Before I talk about SSMS, pgAdmin and DBeaver spatial visualisation solutions, some history about the first spatial tool
10 May, 2020
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FOSSLIC – PostGIS presentations
The people over at the Free and Open Source Software Learning Centre on 19-22nd May 2009 hosted an event that included three sessions on PostGIS
15 April, 2020
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Vectorization: Exploding a linestring or polygon into individual vectors in PostGIS
I find having a vectorising function in my database kit-bag almost indispensable in my work. I have written and revised my Oracle PL/SQL functions that
15 April, 2020
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