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Geometry Storage Format
This article outlines why the storage formats used for geometry data by database spatial APIs are irrelevant: what is important is logical access.
PostGIS: Creating a line inside a polygon
I love working with the PostGIS API. It is a deep and wide river to swim in. But sometime having read, researched, experimented, and not
Spatial Representation of a Communications Pit
This article describes the elements of a telecommunications pit and shows how they can be spatially represented. In particular the concept of a butterfly as a method for displaying the walls of a pit is introduced.
Data Models – Computerised Tree Inventory System
ESRI hosts a set of community created, domain-specific, data models on its website. As I understand the licensing of these data models, they are effectively
Support for ESRI’s ST_GEOMETRY
The following article results from customers downloading the free source code (eg for Oracle SDO_GEOMETRY) on this site without fully understanding that the code is
Using Range Querying to Filter LineString Segments
This article shows how to use range querying against cumulative length to filter/select LineString segments
Google Maps / Bing Maps Spherical Mercator Projection Information
I found this article very useful, I hope you do too. The Google Maps / Bing Maps Spherical Mercator Projection
Silence is Golden?
UPDATE The book has been published If any of my readers are wondering why I have been so quiet of late, here are the reasons.
National Broadband Network, Spatial Data & Processing
As a spatial practitioner familiar with many aspects of spatial data capture and processing, I have been watching the responses to the opportunity that the
Industry Best Practice?
Recently I was asked to review a database migration from one vendor’s database to another’s. The conversion involved geospatial data and database internal representations. I
Documentation
- MySQL Spatial General Function Documentation
- Oracle LRS Object Documentation
- Oracle Spatial Exporter Package Documentation
- Oracle Spatial Object Function Documentation
- Oracle Spatial Object Function Documentation (Multi Page Version)
- PostGIS pl/pgSQL Function Documentation
- SC4O Oracle Java Topology Suite (Stored Procedures) Package Documentation
- SQL Server Spatial General TSQL Function Documentation
- SQL Server Spatial LRS TSQL Function Documentation