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Study Area and Distribution of Satellite Imagery Used in
Mapping
Undisturbed Landscapes in Alaska |
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Ecological Zones Defined in the
Study Area |
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Alaska Ownership Map |
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Protected Areas in Alaska |
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Data Sources for the Analysis of
Forest Composition in Boreal Forests |
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Intact Forest Landscapes and
Forest Landscape Fragments in the Boreal Region |
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Intact Forest Landscapes,
Undisturbed Areas, and Forest Landscape Fragments in the
Kenai-Yakutat Zone |
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Intact Forest Landscapes,
Undisturbed Islands, and Forest Landscape Fragments in the
Tongass Zone |
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Intact Forest Landscapes,
Undisturbed Islands, and Forest Landscape Fragments in the
Kenai-Yakutat Zone |
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Intact Forest Landscapes,
Undisturbed Islands, Forest Landscape Fragments, Protected
Areas and Inventoried Roadless Areas in the Tongass Zone |
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Forests and Non-Forest
Vegetation in Intact Forest Landscapes and Forest Landscape
Fragments in the Boreal Region |
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Forests and Non-Forest
Vegetation in Intact Forest Landscapes, Undisturbed Islands,
and Forest Landscape Fragments in the Kenai-Yakutat Zone |
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Forests and Non-Forest
Vegetation in Intact Forest Landscapes, Undisturbed Islands,
and Forest Landscape Fragments in the Tongass Zone |
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Fire Disturbances in Boreal
Intact Forest Landscapes and Forest Landscape Fragments |
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Forest Cover of North America
Sources: University of Maryland
Global Tree Cover. The UMD Global Tree Cover was derived from
Advanced Very High Resolution Radiometer from 1992-93 and
estimates percentage of woody vegetation and depicts
proportional tree coverage without making distinctions between
different leaf types or forest age. Administrative boundaries
were provided by ESRI (1997).
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million scale poster map (4.3 MB ZIP file)
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Access Grid over Forest Cover in North
America
Transportation lines and utility lines (where available)
were rasterized to 1-km and overlaid on the forest cover to
estimate the extent of low-access forests.
Sources: The access grid was compiled from
three existing datasets, for Canada the DMTI's transportation
layer was used (includes streets, roads, highways,
expressways, local roads, water and utility features. For the
United States, the US Geological Service's Digital Line Graph
Data and Digital Chart of the World (for Alaska).
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poster map (5 MB ZIP file)
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Low-Access Forests in North America
Low-access forests that are an average 500 m
away from transportation lines in different class sizes.
Low-access forest results are different from the previous GFW
Canada assessment because of the land cover base layer used.
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Large Tracts of Low-Access Forests Strictly and
Moderately Protected
Large tracts of low-access forests in North America
(>200 kmē in size) were combined with a protected areas
grid to estimate the amount of low-access forests within
protected areas systems in Canada and the United States.
The grid was generated based on the IUCN codes of input layer
and Categories I-V were re-labeled "strictly and
moderately protected" class.
Sources: The protected areas grid was
generated from the Conservation Biology-World Wildlife
Fund-Canada's Protected Areas Database (PAD).
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poster map (4.9 MB ZIP file)
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