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Editorial Team
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Asked: 2026-05-15T03:03:36+00:00

How can I convert a shapefile from AGD66 to GDA94 programmatically, using open source

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How can I convert a shapefile from AGD66 to GDA94 programmatically, using open source libraries? I don’t want to use arcgisscripting because I don’t have a licence.

This needs to be automatable. A bash or python script would be acceptable.

This is a little more complicated than a normal reprojection, because a different ellipsoid is used between these coordinate reference systems, and thus a distortion grid needs to be used.

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  1. Editorial Team

    Sorry to answer own question, but here goes for posterity. Using the instructions here, first download the distortion grid:

    wget http://www.icsm.gov.au/icsm/gda/gdatm/national66.zip
unzip national66.zip
mkdir -p ~/bin
mv "A66 National (13.09.01).gsb" ~/bin/a66_national.gsb
rm national66.zip

    Then use ogr2ogr to reproject:

    ogr2ogr -f "ESRI Shapefile" -s_srs "+proj=longlat +ellps=aust_SA +nadgrids=~/bin/a66_national.gsb +wktext" -t_srs EPSG:4283 outputgda94.shp inputagd66.shp
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