Jim Griffiths replying on behalf of his co-authors, writes: can I thank Mr Roly Edwards for his contribution of a discussion on our paper and respond to the issues he raises.

The purpose of our paper was to provide a rare quantitative evaluation of the effectiveness of aerial photograph interpretation (API) by analysing the success of the technique in identifying landslides during research into the distribution and causes of landsliding within a single river catchment (Hart 2004). There are examples of studies that have made qualitative statements about how effective or ineffective aerial photograph interpretation can be (e.g....

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