Figure 20: Classification of the Hauraki Gulf using the continuous colour scheme based on the principal components of the eight variables used to define the classification

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A map of the Hauraki Gulf displays a colour scheme based on the results of principal component analysis on the 280 classes generated by non-hierarchical classification. Each class was assigned varying levels of red, green or blue colour based on the PCA analysis. Bluer areas are deeper, with lower mean orbital velocity. Redder areas have higher values of tidal current. Greener areas are associated with higher freshwater fraction and lower SST phase.