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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 AmericaSources: 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). Download 1:10 million scale poster map (4.3 MB ZIP file) |
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Access Grid over Forest Cover in North AmericaTransportation 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). Download 1:10 million scale poster map (5 MB ZIP file) |
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Low-Access Forests in North AmericaLow-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. Download 1:10 million scale poster map (4.3 MB ZIP file) |
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Large Tracts of Low-Access Forests Strictly and Moderately ProtectedLarge 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). Download 1:10 million scale poster map (4.9 MB ZIP file) |
