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Installing PostGIS with built-in Postgresql in Mac OS X Lion Server 10.7.3

We recently upgraded our Snow Leopard Mac OS X server to OS X Lion Server, 10.7.3 and were pleased to find that it comes with a version of PostgreSQL (9.0.5) built-in. We're all for having good stuff built-in so we now just had the task of adding PostGIS to it and we'd be set. However this isn't quite as simple as it could be, but luckily isn't too hard and doesn't require any tinkering with Apple or PG 'makefiles' or other scripts, just the judicious use of a few compiler parameters.

How to crop large polygons in QGis

A step-by-step tutorial on how to crop large polygons to make a smaller one using the open-source GIS product, QGIS.

Using OGR2OGR to re-project a shape file

OGR2OGR is a great command line tool for GIS format conversions providing support for all the 'mainstream' formats as well as plenty of more obscure ones. It is also useful for changing the projection & coordinate system of a map layer.

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