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Since you mentioned using QGIS, I had a similar problem, so I developed a QGIS plugin which is now available in the official QGIS plugins repository and can be found in the QGIS menu: Plugins / Manage and Install Plugins... and search for Disconnected Islands. This plugin runs on a polyline layer, ...


Have a look at your database either in PGAdmin or through the QGIS Browser panel and check to see what your tables are named vs. what the example states. My 'edge_table' is called 'ways' my 'id' is called 'gid'

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