Shaping pre-modern digital terrain models: The former topography at Charlemagne's canal construction site.

PLoS One · 2018 · PMC6033447 · PMID 29975746

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highly significantno p-value reported

The subtraction of the pre-modern model from the modern DTM generates a highly significant raster layer that visualises the local human impact on the relief.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.