(2011) and Xian et al. NLCD Legend Land Cover Class Descriptions 22 Developed, Low Intensity -Includes areas with a mixture of constructed materials and vegetation. Population Data (required only for imperviousness coefficient derivation process) Obtaining the Data . Additional Included in NLCD2016. 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). 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 … Perennial ice/snow: areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. The higher the value, the greater the model uncertainty in estimating the canopy value for that cell. Crop vegetation accounts for greater than 20% of total vegetation. Dwarf scrub: Alaska only areas dominated by shrubs less than 20 centimeters tall with shrub canopy typically greater than 20% of total vegetation. 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. 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. 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. Percent of the pixel that's covered by tree canopy. 4. 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. This class also includes all land being actively tilled. Lichens: Alaska only areas dominated by fruticose or foliose lichens generally greater than 80% of total vegetation. Standardized land cover is mapped in 20 classes for both 2006 and 2011. Impervious surfaces account for 20-49 percent of total cover. Open water: areas of open water, generally with less than 25% cover of vegetation or soil. while the rest of the images rely on the imperviousness data layer for the More than 75% of the tree species shed foliage simultaneously in response to seasonal change. apartment complexes, row houses and commercial/industrial. Shrub/scrub: areas dominated by shrubs less than 5 meters tall with shrub canopy typically greater than 20% of total vegetation. 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 … 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 … Download the per pixel estimates of percent tree canopy legend. Included in images NLCD2011, NLCD2011_AK, NLCD2011_HI, NLCD2011_PR, and NLCD2016. The original land cover map Tertiary road outside urban area : any two-lane road. Examples include apartment complexes, row houses, and commercial/industrial. Urban classes were excluded, as they are derived from a separate product, the impervious estimation. The impervious surface data are represented as the percent impervious cover for each unique watershed. ... Impervious surfaces account for less than 20% of total cover. The proportion of sagebrush canopy in each 30m pixel. 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 … Included in NLCD2016. NLCD Legend Land Cover Class Descriptions 23 Developed, Medium Intensity - Includes areas with a mixture of constructed materials and vegetation. Evergreen forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. been produced by USGS in collaboration with the Bureau of Land Management. Updating the 2001 National Land Cover Database impervious surface products to 2006 using Landsat imagery change detection methods. Average height of sagebrush. 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, 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. Impervious Surface– are mainly artificial surface covered by impenetrable materials (asphalt, concrete, etc.) 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 More than 75% of the tree species maintain their leaves all year. 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. Pasture/hay vegetation accounts for greater than 20% 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. The change index was designed to assist NLCD users to … 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). 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. (They could not be merged in due to having a different projection from the continental US 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. 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. … These areas most commonly include single-family housing units. These roads have been separated in the western United States so that a better categorization of developed features is represented in the landcover. The dead plant material proportion in each 30m pixel. (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. Impervious surfaces account for less than 20% of total cover. Impervious surfaces account for less than 20 percent of total cover. Because of challenges in comparing NLCD datasets from these two years, we used spatial data calculated by Fry et al. Included in NLCD2011, NLCD2011_AK, NLCD2011_HI, and NLCD2011_PR. Island. eight epochs, plus separate images for Alaska, Hawaii, and Puerto Rico in 2001 and 2011. NLCD Legend Land Cover Class Descriptions Developed, High Intensity Developed, High Intensity - Includes highly developed areas where people reside or work in high numbers. The bare ground proportion in each 30m pixel. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover Mixed forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. Included in images NLCD2001, NLCD2006, NLCD2011, and NLCD2016. A new product for NLCD 2016 land cover is the NLCD Land Cover Change Index. Tertiary road in urban area : any two-lane road. Points common to all image pairs were used for classification via decision tree, with cross-validation and boosting options. 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). These areas most commonly include single-family housing units. rive impervious surface coefficients per NLCD 92 class in por-tions of the Mid-Atlantic physiographic region. Most U.S. Geological Survey (USGS) information resides images.). information on Acknowledging or Crediting USGS as Information The 1992 This type can occur with significant other grasses or other grass like plants, and includes sedge tundra and sedge tussock tundra. 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. Primary road in urban area : interstates and other major roads. Secondary road in urban area : non-interstate highways. 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. Included in NLCD2016. Energy production site outside urban area : areas identified from the FrackTracker points and classified in coordination with the Landfire project. These areas are not subject to intensive management such as tilling, but can be utilized for grazing. Source is available. To access this dataset in Earth Engine, please sign up for Earth Engine Developed classes in these years are directly derived from and updated following the impervious surface cycle. All images except NCLD2011_HI and NLCD2011_PR include the landcover classification scheme described in the 2016 Product Legend. 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 class includes true shrubs, young trees in an early successional stage, or trees stunted from environmental conditions. Primary road outside urban area : interstates and other major roads. (2011) for our analysis. The legends are also available as metadata on each image. These products have National Land Cover Data Base (NLCD)– is a 16-classes land cover classification scheme. The classification system used by NLCD2016 is modified from the Anderson Land Cover Classification System*. Nonroad impervious surface outside urban area. 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. urban classes and on a decision-tree classification for the rest. Impervious surface layers (currently provided at nominal 5-year intervals) provide information valuable for hydrologic applications, for example. Energy production site in urban area : areas identified from the FrackTracker points and classified in coordination with the Landfire project. Remote Sensing of Environment, 114, 1676-1686. 30-meter pixel in the Western United States covered by shrub, herbaceous, New for NLCD 2016 is an impervious surface descriptor layer. The USGS acknowledges the support of USGS NLCD 2006 Land Cover … *To view and print the PDF you must obtain and install the Acrobat® Reader, available at no charge from Adobe Systems. Grassland/herbaceous: areas dominated by gramanoid or herbaceous vegetation, generally greater than 80% of total vegetation. NLCD classes. 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. NLCD 2016 Shrub Component products characterize the percentage of each 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). No masking of obvious non-tree areas is performed for this product. This dataset has one image for the continental US for each of the 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. Note that the impervious layers and tree cover layers for Alaska 2011 U.S. Geological Survey. Developed, low intensity: areas with a mixture of constructed materials and vegetation. Impervious surfaces account for 20% to 49% percent of total cover. Impervious surfaces account for 50-79 percent of the total cover. Moss: Alaska only areas dominated by mosses, generally greater than 80% of total vegetation. The polygon does not appear to be a “sealed” surface, and therefore its classification as impervious in the reference data could be debated. Included in images NLCD2001, NLCD2001_AK, NLCD2001_HI, NLCD2001_PR, NLCD2006, NLCD2011, NLCD2011_AK, and NLCD2016. Standard error for the model as a percentage from 0 to 45. Impervious surfaces account for 20-49 percent of total cover. Defines which impervious layer pixels are roads and provides the best fit description for impervious pixels that are not roads. NLCD 2016 land cover and impervious surface product versions of previous dates must be downloaded for proper comparison. This is a powerful tool for analyzing the significance of land cover with, for our specific case, land surface temperature (LST). NLCD Legend … 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. A better categorization of developed features is represented in the 2016 product Legend %. Imperviousness Legend ( NLCD ) imperviousness values images NLCD2001, NLCD2001_AK,,... – percentage of impervious area per Land cover is mapped in 20 classes for both 2006 2011... 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