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NIIRS
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[standards, photogrammetry]
Acronym for National Imagery Interpretability Scale. In imagery, a subjective scale of image quality that defines levels of interpretability in terms of features that can be effectively resolved and identified. Consists of 10 levels, from 0 (lowest quality) to 9 (highest quality). NIIRS depends on ground sample distance (GSD), clarity, and the multispectral characteristics of the sensor system.