FOSS4GUK Conference

I was at FOSS4G UK 2016 which took place at the new Ordnance Survey buildings in Southampton, a few weeks ago. FOSS4G is short for “Free and Open Source Software for Geospatial”, and the conference focuses on some of the key free GIS software such as QGIS and PostGIS. This was a UK-focused event, following … Continue reading FOSS4GUK Conference

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Using the OSTN02 transformation in PostGIS

When converting coordinates between WGS84 (GPS) and OSGB36 (UK National Grid), using OSTN02 can gain us a few metres in accuracy over the basic parametric transformation provided by PostGIS’s st_transform via PROJ.4. Happily, Ordnance Survey now distribute an NTv2 version of the OSTN02 transformation, courtesy of the Defence Geographic Centre, which can be used by […]

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