Download the per pixel estimates of percent imperviousness legend. 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 … 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 … Developed high intensity: highly developed areas where people reside or work in high numbers. Included in NLCD2016. Mixed forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. urban classes and on a decision-tree classification for the rest. Pasture/hay vegetation accounts for greater than 20% of total vegetation. Percent of the pixel covered by developed impervious surface. Download the NLCD2016 land cover classification legend. The annual and perennial grass and forb proportion in each 30m pixel. U.S. Geological Survey. Included in images NLCD2001, NLCD2001_AK, NLCD2001_HI, NLCD2001_PR, NLCD2006, NLCD2011, NLCD2011_AK, and NLCD2016. A new product for NLCD 2016 land cover is the NLCD Land Cover Change Index. Tree Canopy- is the layer of stems of trees, leaves, branches that cover the ground when viewed from above. Updating the 2001 National Land Cover Database impervious surface products to 2006 using Landsat imagery change detection methods. Impervious surfaces account for 80 to100 percent of the total cover. The colored rectangles represent the NLCD points contained within each GOES-16 bounded pixel (red circles). These areas most commonly include single-family housing units. Standard error for the model as a percentage from 0 to 45. 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. 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. The results are many, including an increased burden on stormwater infrastructure, erosion, reduced water quality, 'heat island effects', and both ground-level and water pollution. Because of challenges in comparing NLCD datasets from these two years, we used spatial data calculated by Fry et al. The classes in the 2016 product legend are given below. Earth Engine is free to use for research, education, and nonprofit use. Additional These products have Impervious surfaces account for 50% to 79% of the total cover. Tertiary road outside urban area : any two-lane road. Standardized land cover is mapped in 20 classes for both 2006 and 2011. while the rest of the images rely on the imperviousness data layer for the Source is available. tip of the Alaskan Panhandle up through the Kenai Peninsula, plus Kodiak This index provides a simple and comprehensive way to visualize change from all 7 dates of land cover in a single layer. Canopy is never without green foliage. in the public domain and may be used without restriction. image is not directly comparable to any later editions of NLCD. The change index was designed to assist NLCD users to … eight epochs, plus separate images for Alaska, Hawaii, and Puerto Rico in 2001 and 2011. Impervious surfaces account for 80 to100 percent of the total cover. 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. Impervious surfaces account for 80 to100 percent of the total cover. NLCD classes. NLCD Legend Land Cover Class Descriptions Developed, High Intensity Developed, High Intensity - Includes highly developed areas where people reside or work in high numbers. To illustrate change in percent impervious surface, zonal statistics were performed on spatial data for the change of impervious surface between the years 2001 and 2006. Dwarf scrub: Alaska only areas dominated by shrubs less than 20 centimeters tall with shrub canopy typically greater than 20% of total vegetation. Urban classes were excluded, as they are derived from a separate product, the impervious estimation. Included in NLCD2016. Percent Canopy Density, Percent Impervious Surface (Salt Lake and Mesa sites) – developed, cropland, wetland – as well as offering information on tree canopy cover, impervious urban surfaces, a roads and energy development layer, and grass/shrub coverage layers for the Western U.S. The proportion of big sagebrush canopy in each 30m pixel. New for NLCD 2016 is an impervious surface descriptor layer. To access this dataset in Earth Engine, please sign up for Earth Engine Also included in this release are thematic … For the impervious layer, only the 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. 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 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. Impervious surfaces account for 20-49 percent of total cover. These boundings will allow us to calculate statistics relating GOES-16 data to ground parameters (NLCD). More than 75% of the tree species maintain their leaves all year. NLCD Legend Land Cover Class Descriptions Developed, High Intensity Developed, High Intensity - Includes highly developed areas where people reside or work in high numbers. Examples include apartment complexes, row houses and commercial/industrial. Secondary road in urban area : non-interstate highways. The polygon does not appear to be a “sealed” surface, and therefore its classification as impervious in the reference data could be debated. 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 … The proportion of sagebrush canopy in each 30m pixel. only have data for parts of Alaska. Open water: areas of open water, generally with less than 25% cover of vegetation or soil. Energy production site outside urban area : areas identified from the FrackTracker points and classified in coordination with the Landfire project. bare ground, litter, sagebrush, big sagebrush and annual herbaceous, along apartment complexes, row houses and commercial/industrial. More than 75% of the tree species shed foliage simultaneously in response to seasonal change. The NLCD consistently quantifies the percent anthropogenic TIA for the NLCD at a 30-meter … rive impervious surface coefficients per NLCD 92 class in por-tions of the Mid-Atlantic physiographic region. Cells without 100% coverage by NLCD and EnviroAtlas data were excluded from the analyses. Sedge/herbaceous: Alaska only areas dominated by sedges and forbs, generally greater than 80% of total vegetation. Note that the impervious layers and tree cover layers for Alaska 2011 The original land cover map Impervious surfaces account for 20% to 49% percent of total cover. 4. (2011) for our analysis. Consequently, the actual cell sizes were 1.44 ha (4-x-4 NLCD pixels), 5.76 ha (8-x-8 NLCD pixels), 10.89 ha (11-x-11 NLCD pixels), 32.49 ha (19-x-19 NLCD pixels), 51.84 ha (24-x-24 NLCD pixels), 98.01 ha (33-x-33 NLCD pixels), and 198.81 ha (47-x-47 NLCD pixels). 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 … 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. 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. Island. The legends are also available as metadata on each image. Evergreen forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. This type can occur with significant other grasses or other grass like plants, and includes sedge tundra and sedge tussock tundra. Impervious surface layers (currently provided at nominal 5-year intervals) provide information valuable for hydrologic applications, for example. All images except NCLD2011_HI and NLCD2011_PR include the landcover classification scheme described in the 2016 Product Legend. These areas most commonly include single-family housing units. Included in NLCD2016. This class also includes all land being actively tilled. The U.S. NLCD impervious surface data set may provide a high-quality nationally consistent land cover data set in a GIS-ready format that can be used to estimate TIA value. Barren land (rock/sand/clay): areas of bedrock, desert pavement, scarps, talus, slides, volcanic material, glacial debris, sand dunes, strip mines, gravel pits, and other accumulations of earthen material. No new imperviousness products for Alaska, Hawaii and Puerto Rico are available from NLCD 2016. Most U.S. Geological Survey (USGS) information resides images.). The dead plant material proportion in each 30m pixel. Energy production site in urban area : areas identified from the FrackTracker points and classified in coordination with the Landfire project. ... Impervious surfaces account for less than 20% of total cover. 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). These areas most commonly include single-family housing units. The USGS acknowledges the support of USGS NLCD 2006 Land Cover … NLCD 2016 land cover and impervious surface product versions of previous dates must be downloaded for proper comparison. Impervious surfaces account for 20-49 percent of total cover. NLCD 2016 offers 7 integrated epochs of land cover for years 2001, 2003, 2006, 2008, 2011, 2013, and 2016. USA NLCD Impervious Surface USA NLCD Land Cover 2006 USA NLCD Land Cover 2011 USA NLCD Land Cover Change. 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 30-meter pixel in the Western United States covered by shrub, herbaceous, 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. No masking of obvious non-tree areas is performed for this product. surface characteristic value tables in the appendices of the AERSURFACE User’s Guide Remote Sensing of Environment, 114, 1676-1686. Lichens: Alaska only areas dominated by fruticose or foliose lichens generally greater than 80% of total vegetation. then return to this page. The 1992 Tree cover is only available on a strip along the coast from the southern 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. Developed, open space: areas with a mixture of some constructed materials, but mostly vegetation in the form of lawn grasses. The proportion of shrub canopy in each 30m pixel. Impervious surfaces account for less than 20% of total cover. 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. Examples include apartment complexes, row houses and commercial/industrial. 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 Code:24 NLCD Class: HIGH INTENSITY DEVELOPED SE Gap Analysis Project - Land Cover Legend Neither deciduous nor evergreen species are greater than 75% of total tree cover. Average height of shrubs. The suite of cell sizes was … Included in NLCD2016. with estimating shrub height and sagebrush height. 2018, A New Generation of the United States National Land Cover Database: Requirements, Research Priorities, Design, and Implementation Strategies, p. 108–123. The classification system used by NLCD2016 is modified from the Anderson Land Cover Classification System*. The annual only grass and forb proportion in each in 30m pixel. (Note: These coefficients will be derived as an example in the Tutorial and the process can be repeated for other areas.) National Land Cover Data Base (NLCD)– is a 16-classes land cover classification scheme. 22: Developed, Low Intensity- areas with a mixture of … NLCD Legend Land Cover Class Descriptions 23 Developed, Medium Intensity - Includes areas with a mixture of constructed materials and vegetation. Developed, medium intensity: areas with a mixture of constructed materials and vegetation. Tertiary road in urban area : any two-lane road. (Source: NLCD Legend Land Cover Class Descriptions) Value Definition; 11: Open Water - All areas of open water, generally with less than 25% cover or vegetation or soil 12: Perennial Ice/Snow - All areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. Percent of the pixel that's covered by tree canopy. Impervious surfaces account for 80% to 100% of the total cover. Defines which impervious layer pixels are roads and provides the best fit description for impervious pixels that are not roads. landcover,shrub,shrubland, The symbology uses a 7-class graduated color ramp with thresholds set according to Schueler et al (2009) Reformulated Impervious Cover Model. These roads have been separated in the western United States so that a better categorization of developed features is represented in the landcover. Deciduous forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. Examples include apartment complexes, row houses, and commercial/industrial. Nonroad impervious surface outside urban area. Included in NLCD2011, NLCD2011_AK, NLCD2011_HI, and NLCD2011_PR. Developed classes in these years are directly derived from and updated following the impervious surface cycle. Perennial ice/snow: areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. The bare ground proportion in each 30m pixel. (They could not be merged in due to having a different projection from the continental US Grassland/herbaceous: areas dominated by gramanoid or herbaceous vegetation, generally greater than 80% of total vegetation. Generally, vegetation accounts for less than 15% of total cover. Shrub/scrub: areas dominated by shrubs less than 5 meters tall with shrub canopy typically greater than 20% of total vegetation. 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. This dataset has one image for the continental US for each of the Download the per pixel estimates of percent tree canopy legend. Primary road outside urban area : interstates and other major roads. … Included in NLCD2016. Secondary road outside urban area : non-interstate highways. In the NLCD land cover data, the 1 ha polygon is subsumed into a tract of cropland that is immediately north and west of it. National Land Cover Database 2016 (NLCD2016) Legend, Anderson Land Cover Classification System. Included in NLCD2016. NLCD products are created by the Multi-Resolution Land Characteristics With the production and release of NLCD 2006, MRLC has initiated a shift from land-cover mapping to land-cover monitoring (Fry et al., 2011). NLCD Legend … Impervious surfaces account for less than 20 percent of total cover. NLCD also provides unique products not represented in LCMAP data that may be useful for specific user applications. Impervious surfaces account for 50-79 percent of the total cover. Thinned road in urban area : small tertiary roads that generally are not paved and have been removed from the landcover but remain as part of the impervious surface product. 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. Included in NLCD2016. NLCD Legend Land Cover Class Descriptions 22 Developed, Low Intensity -Includes areas with a mixture of constructed materials and vegetation. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover database spanning 8 epochs (1992, 2001, 2004, 2006, 2008, 2011, 2013 and 2016). Thinned road outside urban area : small tertiary roads that generally are not paved and have been removed from the landcover but remain as part of the impervious surface product. (MRLC) Consortium, a partnership of federal agencies led by the Population Data (required only for imperviousness coefficient derivation process) Obtaining the Data . 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). Moss: Alaska only areas dominated by mosses, generally greater than 80% of total vegetation. information on Acknowledging or Crediting USGS as Information Included in images NLCD2001, NLCD2006, NLCD2011, and NLCD2016. Woody wetlands: areas where forest or shrubland vegetation accounts for greater than 20% of vegetative cover and the soil or substrate is periodically saturated with or covered with water. Impervious Surface Coefficients – percentage of impervious area per land cover class based on National Land Cover Database (NLCD) imperviousness values. parts of Kenai Peninsula Borough and Anchorage Municipality are available. These areas most commonly include single-family housing units. Crop vegetation accounts for greater than 20% of total vegetation. Source, A New Generation of the United States National Land Cover Database: Requirements, Research Priorities, Design, and Implementation Strategies. The impervious surface data are represented as the percent impervious cover for each unique watershed. Included in NLCD2016. Impervious surfaces, including paved areas such as roads, parking lots, and sidewalks as well as rooftops, prevent water from draining naturally into the ground. 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. Download the NLCD2016 land cover classification legend. 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. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover 1992 data are primarily based on unsupervised classification of Landsat data, while the rest of the images rely on the imperviousness data layer for the ... USGS/NLCD, These areas are not subject to intensive management such as tilling, but can be utilized for grazing. The higher the value, the greater the model uncertainty in estimating the canopy value for that cell. Points common to all image pairs were used for classification via decision tree, with cross-validation and boosting options. Included in images NLCD2011, NLCD2011_AK, NLCD2011_HI, NLCD2011_PR, and NLCD2016. Nonroad impervious surface in urban area. This is a powerful tool for analyzing the significance of land cover with, for our specific case, land surface temperature (LST). 1992 data are primarily based on unsupervised classification of Landsat data, database spanning 8 epochs (1992, 2001, 2004, 2006, 2008, 2011, 2013 and 2016). The USA NLCD Land Cover Change layer shows only the land cover that changed type between 2006 and 2011, displaying areas of no change with a transparent symbol. (2011) and Xian et al. NLCD 2016 Shrub Component products characterize the percentage of each Impervious Surface– are mainly artificial surface covered by impenetrable materials (asphalt, concrete, etc.) 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. This type is often co-associated with grasses, sedges, herbs, and non-vascular vegetation. Developed, low intensity: areas with a mixture of constructed materials and vegetation. These roads have been separated in the western United States so that a better categorization of developed features is represented in the landcover. Average height of sagebrush. Included in NLCD2016. *To view and print the PDF you must obtain and install the Acrobat® Reader, available at no charge from Adobe Systems. New for NLCD 2016 is an impervious surface descriptor layer. 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. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover database spanning 8 epochs (1992, 2001, 2004, 2006, 2008, 2011, 2013 and 2016). Primary road in urban area : interstates and other major roads. This class includes true shrubs, young trees in an early successional stage, or trees stunted from environmental conditions. been produced by USGS in collaboration with the Bureau of Land Management. And other major roads NLCD2006, NLCD2011, NLCD2011_AK, NLCD2011_HI, and greater 20. These Coefficients will be nlcd impervious surface legend as an example in the public domain and be... 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