A tetrahedron-based endmember selection approach for urban impervious surface mapping.

PLoS One · 2014 · PMC4043487 · PMID 24892938

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virtually significantno p-value reported

This step involved an incremental testing procedure to locate the base of the sub tetrahedron, which was made to converge when spectral characteristics of the current pixel set and previous one are virtually significant difference.

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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.