{ "snippet": "PNV is a classification system that uses indicator plant species to designate a biophysical environment (ecological potential) and infer a potential suite of ecosystem structures and compositions, along with functions, including disturbance, through time. It integrates the climate, geology, geomorphology, soils, and vegetation in an area. PNV is a biological indicator of land capability for supplying the array of ecosystem services the landscape provides.", "summary": "PNV is a classification system that uses indicator plant species to designate a biophysical environment (ecological potential) and infer a potential suite of ecosystem structures and compositions, along with functions, including disturbance, through time. It integrates the climate, geology, geomorphology, soils, and vegetation in an area. PNV is a biological indicator of land capability for supplying the array of ecosystem services the landscape provides.", "accessInformation": "ELK citation: https://www.fs.usda.gov/pnw/tools/westside-elk-model-toolbox; Rowland et al. 2018 Wildlife Monograph (https://www.fs.usda.gov/treesearch/pubs/57491)", "thumbnail": "thumbnail/thumbnail.png", "maxScale": 5000, "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "description": "

The Vegzone layer was derived from overstory and understory species composition and abundance (percent cover) information in existing Gradient Nearest Neighbor (GNN) vegetation maps developed by the Landscape Ecology, Modeling, Mapping, and Analysis (LEMMA) group in the Pacific Northwest Research Station (http://lemma.forestry.oregonstate.edu/). <\/span><\/p>

Species composition in the imputations is determined from forest inventory plot data (1990-2019). A combination of FIA-Periodic, FIA-Annual, and R6/R5 CVS plot designs were used to determine PVT at the vegzone (Series) and subzone (Subseries or Plant Association Group (PAG)) levels. FIA-Periodic and R6/R5 CVS Inventory plots were used where they were co-located with FIA-Annual plots to help interpret previous or subsequent disturbance and succession. These Interpretations are based on multiple observations (2-5 obs per location) of species composition through time. Each plot location was assigned 1 vegzone and 1 subzone across all observations based on a vegzone/subzone ruleset (Key) programmed in R. <\/span><\/p>

Map Data (1986-2017) consists of annual imputations of FIA-Annual Plots (2001-2016) only, using GNN K-1 (single nearest neighbor) methodology (Ohmann 2001). Each raster call was evaluated across all imputation years (1986-2017) for subzone Majority, subzone Min Rank (earliest subzone in the ruleset), and subzone Variety. Subzone Variety was used as an index of disturbance through time. Where subzone Variety >4, the cell was considered disturbed and subzone Min Rank was used in the final PVT map for that raster cell. Where subzone Variety was <=4, the cell was considered undisturbed and subzone Majority was used in the final PVT map.<\/span><\/p>

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Presence and percent cover of tree species were used to infer potential forest vegetation zones. Other indicator species (trees not used in vegetation zone delineation and understory species) were grouped by moisture and temperature regimes. The abundance and number of species in a group served as indicators for moisture and temperature subzones within a vegetation zone. This delineation often indicated different disturbance regimes, rates of development after disturbance, and ultimately what type of forest would dominate in the absence of disturbance. GNN maps for the entire 1986-2017 LandTrendr normalized Landsat time sequence were used to account for species composition changes owing to recent disturbances such as fire or timber harvest. Where imputations from different map years were highly variable (>4 different vegzone/subzones) indicating 1 or more disturbances, the higher ranked (generally more mesic) vegetation zone and subzone was assigned.<\/span><\/p><\/div><\/div><\/div>", "licenseInfo": "

The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly. <\/span><\/p>

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Additionally, the U.S. Forest Service waives copyright and related rights in the work worldwide through the CC0 (which can be found at https://creativecommons.org/public-domain/cc0/). <\/span><\/p>

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Non-Discrimination Statement <\/span><\/p>

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In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident. <\/span><\/p>

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To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at How to File a Program Discrimination Complaint and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form. To request a copy of the complaint form, call (866) 632-9992. Submit your completed form or letter to USDA by: (1) mail: U.S. Department of Agriculture, Office of the Assistant Secretary for Civil Rights, 1400 Independence Avenue, SW, Mail Stop 9410, Washington, D.C. 20250-9410; (2) fax: (202) 690-7442; or (3) email: program.intake@usda.gov. <\/span><\/p>

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USDA is an equal opportunity provider, employer, and lender. <\/span><\/p><\/div><\/div><\/div>", "catalogPath": "", "title": "USFS_Vegetation_Zones", "type": "Image Service", "url": "", "tags": [ "USFS", "IIPP", "Vegetation", "Zones", "Vegzone" ], "culture": "en-US", "portalUrl": "", "name": "USFS_Vegetation_Zones", "guid": "", "minScale": 150000000, "spatialReference": "WGS_1984_Web_Mercator_Auxiliary_Sphere" }