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snippet:	The goal of this project is to provide a rigorous large-area shrubland-habitat classification and inventory with statistically validated products and estimates...
summary:	The goal of this project is to provide a rigorous large-area shrubland-habitat classification and inventory with statistically validated products and estimates...
accessInformation:	U.S. Geological Survey (USGS) Bureau of Land Management (BLM)
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description:	Quantifying Western U.S. shrublands as a series of fractional components with remote sensing provides a new way to understand these changing ecosystems. The USGS NLCD team in collaboration with the BLM has produced the most comprehensive remote sensing-based quantification of Western U.S. shrublands to date. Nine shrubland ecosystem components, including percent shrub, sagebrush (Artemisia spp), big sagebrush, herbaceous, annual herbaceous, litter, and bare ground cover, along with sagebrush and shrub heights, were quantified at 30-m resolution by mapping region. Each region required extensive ground measurement for model training and validation, two scales of remote sensing data from commercial high-resolution satellites and Landsat 8, and regression tree modeling to create component predictions. In the mapped portion (1,946,100 km²) of the total study area (2,557,556 km²), bare ground averaged 46.8%, shrub 14.4%, sagebrush 4.4%, big sagebrush 3.1%, herbaceous 22.8%, annual herbaceous 4.3% and litter 15.6%. Shrub height averaged 39.8 cm and sagebrush height 10.5 cm. Component accuracies using independent validation averaged R² values of 0.46, RMSE of 10.37 and nRMSE of 0.12, and cross validation averaged R² values of 0.72, RMSE of 5.09 and nRMSE of 0.062. Component composition strongly diverges by level III ecoregions, where 13 of 22 ecoregions are bare ground dominant, 8 are herbaceous dominant, and one is shrub dominant. Sagebrush physically covers 86,219 km², or 4.4%, of our study area, but it is present in 835,507 km², or 42.9%, of the non-masked area of our study area, underscoring its widespread distribution. Fractional component maps will be integrated into the 2016 National Land Cover Database (NLCD). Component products can be downloaded from www.mrlc.gov.
licenseInfo:	These data are all provisional products. There is no guarantee of warranty concerning the accuracy of the data. Users should be aware that these data were developed from models which can contain some local error. Also, temporal changes may have occurred since data were collected, resulting in discrepancies between data and actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies these data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to https://www.usgs.gov/privacy.html for the USGS disclaimer.
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title:	National Land Cover Database (NLCD) 2016 Shrubland Fractional Components for the Western U.S.
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tags:	["biota","environment","geoscientificInformation","imageryBaseMapsEarthCover","shrubland ecosystems","terrestrial ecosystems","shrublands","shrub","sagebrush","big sagebrush","herbaceous","annual herbaceous","litter","grass","vegetation","bare ground","rangeland","shrubland","United States","Washington","Oregon","Montana","North Dakota","South Dakota","Wyoming","Idaho","Nebraska","Nevada","Utah","California","Colorado","Arizona","Texas","New Mexico","NM","TX","AZ","CO","CA","UT","NV","NE","ID","WY","SD","ND","MT","OR","WA","Great Basin","Arizona Plateau","Black Hills","Blue Mountains","Chihuahuan Desert","Colorado Plateau","Columbia Plateau","Grand Canyon","Middle Rockies","Rocky Mountains","Gunnison","Sonoran Desert","Southwest Tablelands","Three Forks","Wasatch","Western US","Yellowstone","Northern Mountainous"]
culture:	en-US
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