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  1. [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 (worst quality) to 9 (best quality). NIIRS depends on ground sample distance (GSD), clarity, and the multispectral characteristics of the sensor system.

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