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B.C. Home »  Wildlife > WHR > ERM Mapping Tool > Overlay ERM Themes

User's Guide for ERM Mapping Tool

Overlay ERM Themes

Read here about menu options that permit overlays.

Two types of overlays are available: (1) Polygon added, and (2) Polygon weighted.

Polygon added adds the ratings from two or more themes. Results higher than 100% are set to 100% and displayed as the highest class rating.

Polygon weighted permits you to calculate a weighted average of two or more themes.

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