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Canada's Forest Inventory 2001 - Publications du gouvernement du ...

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Figure 4 illustrates how stand-level data were aggregated to fewer and standardized records, including<br />

the change in scale from about 1:20 000 to 1:20 000 000. Original stand-level data usually has one record<br />

per stand. When each stand was classified to CanFI<strong>2001</strong> specifications, many stands within a summary<br />

unit were similarly classified. These similar stands have been aggregated within summary units (their<br />

areas and volumes are summed) so that, at the summary-unit level, there is only one record for each<br />

grouping of stands with the same CanFI<strong>2001</strong> attributes. Stand boundaries have not been retained in the<br />

CanFI<strong>2001</strong> GIS coverage: the summary unit is the smallest geographic unit.<br />

8

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