The index of ecological integrity (IEI) is a measure of relative intactness and resiliency of environmental change. By intactness, we mean freedom from human modifications and human-induced disturbance. By resiliency, we mean ability to remain intact and high quality despite disturbances and climate change. It is a composite index based on 19 different measures of landscape intactness and resiliency. This version of IEI (compare to “weighted index of ecological integrity”) displays values only for aquatic systems as a convenience for users.
For this project, IEI was rescaled to each ecological system, and by HUC6 watershed. In contrast to the terrestrial IEI, the aquatic IEI was not modified by weighting any aquatic systems.
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Read the Technical Abstract for this data layer (ieiAquatic.tif).