Layer: Alaskan Yellow Cedar Range (ID: 1)

Name: Alaskan Yellow Cedar Range

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Description: The yellow-cedar distribution map that we developed is a major revision of the geographic occurrence of yellow-cedar in Alaska and throughout its range since publication of the Atlas of United States Trees (Little 1971). The new rangewide yellow-cedar map and the components used to build it are described in detail in section 1. The Alaska portion is outlined briefly here as it is the basis for the assessment of yellow-cedar habitat suitability and risk of decline presented in this section. The rangewide distribution was developed at a resolution of 240 m, which is the common denominator for all input data sources. Yellow-cedar areas represented in Prince William Sound and Glacier Bay National Park were derived by using “sketched polygon” methods from boat and aerial surveys. The 240-m rasterized data layer was applied in the respective zones of Glacier Bay, and northwestward for the yellow-cedar suitability/vulnerability predictions. There were either few or no forest inventory plots in these areas to inform a distribution model such as Ellenwood’s for these areas. The Ellenwood model’s 30-m forest parameter data are present only in the southeast Alaska subregion. Therefore, this new data layer (see following) is represented in an aggregated companion dataset at 240 m in order to include the Pacific Coast and south-central Alaska subregions of the Alaskan coastal forest. The Ellenwood 30-m-extent geographic information systems (GIS) layer for yellow-cedar represents the best available predictive source for areas in southeast Alaska south of Glacier Bay and the Haines area. This layer was produced for those pixels where the calculated probability was ≥50 percent; any single isolated pixels were removed and filled in. Those results were then buffered by two pixels and applied as representing yellow-cedar presence in the respective zones south of, but not including, Glacier Bay and Haines for the yellow-cedar suitability/vulnerability predictions. More information is available in the full report: https://www.fs.fed.us/pnw/pubs/pnw_gtr917.pdf

Copyright Text: Hennon, P. E., McKenzie, C. M., D'Amore, D., Wittwer, D. T., Mulvey, R. L., Lamb, M. S., Biles, F. E., and Cronn, R. C. (2016). A climate adaptation strategy for conservation and management of yellow-cedar in Alaska. https://www.fs.fed.us/pnw/pubs/pnw_gtr917.pdf

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