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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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How to apply spatial constraints to PostGIS tables
This article was written before TypeMod was introduced eg Geometry(Polygon,28355) As I have pointed out in other blog articles, spatial data quality should not engender
15 April, 2020
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Loading and Processing GPX 1.1 files using PostgreSQL XML
My good friend Regina Obe has taken my article Loading and Processing GPX 1.1 files using Oracle XMLDB and implemented it using PostgreSQL’s XML implementation.
15 April, 2020
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