No masking of obvious non-tree areas is performed for this product. Perennial ice/snow: areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. Developed, open space: areas with a mixture of some constructed materials, but mostly vegetation in the form of lawn grasses. Evergreen forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. NLCD 2006 percent developed impervious pixels, identified as changed, were extracted to NLCD developed class codes using NLCD 2001 legend thresholds for developed classes and added to the change pixel map. (They could not be merged in due to having a different projection from the continental US The classes in the 2016 product legend are given below. in the public domain and may be used without restriction. Source is available. (2011) and Xian et al. Examples include apartment complexes, row houses, and commercial/industrial. Impervious surface layers (currently provided at nominal 5-year intervals) provide information valuable for hydrologic applications, for example. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover Developed high intensity: highly developed areas where people reside or work in high numbers. Included in NLCD2016. Nonroad impervious surface in urban area. eight epochs, plus separate images for Alaska, Hawaii, and Puerto Rico in 2001 and 2011. Included in images NLCD2001, NLCD2001_AK, NLCD2001_HI, NLCD2001_PR, NLCD2006, NLCD2011, NLCD2011_AK, and NLCD2016. NLCD 2016 Shrub Component products characterize the percentage of each NLCD 2016 land cover and impervious surface product versions of previous dates must be downloaded for proper comparison. National Land Cover Data Base (NLCD)– is a 16-classes land cover classification scheme. Secondary road outside urban area : non-interstate highways. ... Impervious surfaces account for less than 20% of total cover. These areas are not subject to intensive management such as tilling, but can be utilized for grazing. The dead plant material proportion in each 30m pixel. NLCD 2011 percent developed impervious pixels, identified as changed, were extracted to NLCD developed class codes using NLCD 2011 legend thresholds for developed classes and added to the change pixel map. Impervious surfaces account for less than 20 percent of total cover. These areas most commonly include large-lot single-family housing units, parks, golf courses, and vegetation planted in developed settings for recreation, erosion control, or aesthetic purposes. These areas most commonly include single-family housing units. Percent Canopy Density, Percent Impervious Surface (Salt Lake and Mesa sites) – Tertiary road in urban area : any two-lane road. Cultivated crops: areas used for the production of annual crops, such as corn, soybeans, vegetables, tobacco, and cotton, and also perennial woody crops such as orchards and vineyards. NLCD released its most expansive and detailed database to date in mid-2019, sorting each 30-meter plot of ground in the country into a land cover class – e.g. Primary road in urban area : interstates and other major roads. Secondary road in urban area : non-interstate highways. bare ground, litter, sagebrush, big sagebrush and annual herbaceous, along Impervious surfaces account for 20% to 49% percent of total cover. These areas most commonly include large-lot single-family housing units, parks, golf courses, and vegetation planted in developed settings for recreation, erosion control, or aesthetic purposes. 4. 1992 data are primarily based on unsupervised classification of Landsat data, Emergent herbaceous wetlands: areas where perennial herbaceous vegetation accounts for greater than 80% of vegetative cover and the soil or substrate is periodically saturated with or covered with water. rive impervious surface coefficients per NLCD 92 class in por-tions of the Mid-Atlantic physiographic region. No new imperviousness products for Alaska, Hawaii and Puerto Rico are available from NLCD 2016. NLCD provides spatial reference and descriptive data for characteristics of the land surface such as thematic class (for example, urban, agriculture, and forest), percent impervious surface, and percent tree canopy cover. NLCD Legend Land Cover Class Descriptions Developed, High Intensity Developed, High Intensity - Includes highly developed areas where people reside or work in high numbers. U.S. Geological Survey. The impervious surface data are represented as the percent impervious cover for each unique watershed. NLCD Legend Land Cover Class Descriptions: 21: Developed, Open Space - Includes areas with a mixture of some constructed materials, but mostly vegetation in the form of lawn grasses. National Land Cover Dataset: Impervious Surface 2001 The National Land Cover Dataset (NLCD) Impervious Surface 2001 is a raster impervious cover map developed by the U.S. Geological Survey (USGS) for the conterminous United States, southeast Alaska, Hawaii, and Puerto Rico at a spatial resolution of 30 meters. The proportion of big sagebrush canopy in each 30m pixel. Download the NLCD2016 land cover classification legend. The annual only grass and forb proportion in each in 30m pixel. These areas most commonly include single-family housing units. Impervious surfaces account for 80 to100 percent of the total cover. Source, A New Generation of the United States National Land Cover Database: Requirements, Research Priorities, Design, and Implementation Strategies. Defines which impervious layer pixels are roads and provides the best fit description for impervious pixels that are not roads. while the rest of the images rely on the imperviousness data layer for the This intermediate change pixel product was generalized using the NLCD Smart Eliminate tool with the following minimum mapping units (mmu) applied: 1 acre (approximately 5 … Remote Sensing of Environment, 114, 1676-1686. Additional Impervious surfaces account for less than 20% of total cover. Included in NLCD2011, NLCD2011_AK, NLCD2011_HI, and NLCD2011_PR. Nonroad impervious surface outside urban area. Examples include apartment complexes, row houses and commercial/industrial. These boundings will allow us to calculate statistics relating GOES-16 data to ground parameters (NLCD). The classification system used by NLCD2016 is modified from the Anderson Land Cover Classification System*. Pasture/hay: areas of grasses, legumes, or grass-legume mixtures planted for livestock grazing or the production of seed or hay crops, typically on a perennial cycle. Because of challenges in comparing NLCD datasets from these two years, we used spatial data calculated by Fry et al. mrlc,nlcd,usgs,blm, https://developers.google.com/earth-engine/datasets, Ask questions using the google-earth-engine tag, Sign up for the Google Developers newsletter, Acknowledging or Crediting USGS as Information Included in NLCD2016. Updating the 2001 National Land Cover Database impervious surface products to 2006 using Landsat imagery change detection methods. Percent of the pixel that's covered by tree canopy. New for NLCD 2016 is an impervious surface descriptor layer. Accuracy assessment of NLCD 2006 focused on four primary products: 2001 land cover, 2006 land cover, land-cover change between 2001 and 2006, and impervious surface … Standard error for the model as a percentage from 0 to 45. The change index was designed to assist NLCD users to … NLCD Legend … USA NLCD Impervious Surface USA NLCD Land Cover 2006 USA NLCD Land Cover 2011 USA NLCD Land Cover Change. Included in NLCD2016. These areas most commonly include single-family housing units. NLCD 2016 represents the latest evolution of NLCD land cover products focused on providing innovative land cover and land cover change data for the Nation. NLCD 2016 products include 20 classes of land cover for Alaska, as well as a separate product that defines impervious surfaces in urban areas (usually composed of concrete, asphalt, stone, and metal — widely recognized as a key indicator of environmental quality in urban areas). This descriptor layer identifies types of roads, core urban areas, and energy production sites for each impervious pixel to allow deeper analysis of developed features. Note that the impervious layers and tree cover layers for Alaska 2011 Developed classes in these years are directly derived from and updated following the impervious surface cycle. Tree Canopy- is the layer of stems of trees, leaves, branches that cover the ground when viewed from above. Tree cover is only available on a strip along the coast from the southern Accuracy assessment of NLCD 2006 land cover and impervious surface James D. Wickham a,⁎, Stephen V. Stehman b, Leila Gass c, Jon Dewitz d, Joyce A. Fry d, Timothy G. Wade a … Dwarf scrub: Alaska only areas dominated by shrubs less than 20 centimeters tall with shrub canopy typically greater than 20% of total vegetation. Impervious surfaces account for 80% to 100% of the total cover. Impervious surfaces account for 20-49 percent of total cover. Moss: Alaska only areas dominated by mosses, generally greater than 80% of total vegetation. Percent of the pixel covered by developed impervious surface. The legends are also available as metadata on each image. The bare ground proportion in each 30m pixel. Grassland/herbaceous: areas dominated by gramanoid or herbaceous vegetation, generally greater than 80% of total vegetation. NLCD 2016 updates all previously released versions of impervious products for CONUS (NLCD 2001, NLCD 2006, NLCD 2011) along with a new date of impervious surface for 2016. Examples include apartment complexes, row houses and commercial/industrial. NLCD Legend Land Cover Class Descriptions: 12: Perennial Ice/Snow - All areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. Developed, medium intensity: areas with a mixture of constructed materials and vegetation. Impervious surfaces, including paved areas such as roads, parking lots, and sidewalks as well as rooftops, prevent water from draining naturally into the ground. with estimating shrub height and sagebrush height. This intermediate change pixel product was generalized using the NLCD Smart Eliminate tool with the following minimum mapping units (mmu) applied: 1 acre (approximately 5 … (Note: These coefficients will be derived as an example in the Tutorial and the process can be repeated for other areas.) Included in NLCD2016. Average height of shrubs. only have data for parts of Alaska. Lichens: Alaska only areas dominated by fruticose or foliose lichens generally greater than 80% of total vegetation. Earth Engine is free to use for research, education, and nonprofit use. The annual and perennial grass and forb proportion in each 30m pixel. Standardized land cover is mapped in 20 classes for both 2006 and 2011. This class also includes all land being actively tilled. Open water: areas of open water, generally with less than 25% cover of vegetation or soil. This index provides a simple and comprehensive way to visualize change from all 7 dates of land cover in a single layer. Yang, L., Jin, S., Danielson, P., Homer, C., Gass, L., Case, A., Costello, C., Dewitz, J., Fry, J., Funk, M., Grannemann, B., Rigge, M. and G. Xian. Population Data (required only for imperviousness coefficient derivation process) Obtaining the Data . Impervious surfaces account for 50% to 79% of the total cover. tip of the Alaskan Panhandle up through the Kenai Peninsula, plus Kodiak Included in NLCD2016. Impervious Surface– are mainly artificial surface covered by impenetrable materials (asphalt, concrete, etc.) This type is often co-associated with grasses, sedges, herbs, and non-vascular vegetation. The proportion of sagebrush canopy in each 30m pixel. Shrub/scrub: areas dominated by shrubs less than 5 meters tall with shrub canopy typically greater than 20% of total vegetation. The proportion of shrub canopy in each 30m pixel. NLCD products are created by the Multi-Resolution Land Characteristics (MRLC) Consortium, a partnership of federal agencies led by the NLCD 2006 in turn has built upon NLCD 2001 by incorporating land-cover and impervious surface change for the continental United States (Fry et al., 2011, Xian et al., 2011). The higher the value, the greater the model uncertainty in estimating the canopy value for that cell. been produced by USGS in collaboration with the Bureau of Land Management. Deciduous forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. More than 75% of the tree species shed foliage simultaneously in response to seasonal change. This dataset has one image for the continental US for each of the Average height of sagebrush. 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