ERS215 Lecture Notes - Lecture 5: Spatial Analysis

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Do not distinguish between direct and indirect impacts. Do not link action and impact (cause-effect) Difficult to distinguish relationships (link action to impact) Can identify magnitude of impacts direct and indirect impacts. Good visual tools for communicating and displaying. Ea results complex and difficult to communicate and display ea results. Gives no indication of impact magnitude or significance. Excellent for impact identification and spatial analysis. Likelihood and reversibility of impacts not well addressed. Impact significance is a subjective and value-dependent notion. It is about making judgements on what is important, desirable and acceptable. Determining the significance of environmental effects is one of the most critical components of the ea process but also the most complex. Impact significance is about making judgements on what is important, desirable and acceptable. It is taking into account the effectiveness of proposed mitigation measures. Impact significance is measured by the impact characteristic (eg. duration, extent) and the impact importance (eg. value of receptor).

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