Given the importance of evaluating global land cover data for producers and potential users, the 2010 MODIS v5.1 LCT product IGBP (International Geosphere-Biosphere Programme) layer was evaluated based on two grid maps at scales of 100-m and 500-m,which were derived by rasterizing the 2010 data from the national land use/cover database of China . Scientific models are being scripted to automate the process and operational production is underway. Eyes on Earthis a podcast on remote sensing, Earth observation, land change and science, broughtto you by theUSGS Earth Resources Observation and Science (EROS) Center. percentage) cover of shrub, herbaceous, bare ground, litter, sagebrush, and annual herbaceous in each 30-meter pixel in the Western United States. See included spatial metadata for more details. Export to . Shrub/scrub: areas dominated by shrubs less than 5 meters tall with shrub canopy typically greater than 20% of total vegetation. Perennial ice/snow: areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover. The data have been arranged into four tiles to facilitate timely display and manipulation within a Geographic Information System, browse graphic: nlcd01-partition.jpg The National Land Cover Data Set for 2001 was produced through a cooperative project conducted by the Mul, The land-cover thematic accuracy of NLCD 2001 was assessed from a probability-sample of 15,000pixels. The land cover data sets are single band raster images. Child Items (3) National Land Cover Database (NLCD) 2019 Impervious Products In this episode, we learn about the latest land cover release from EROS. 2012-3020. close. Earth Engine is free to use for research, education, and nonprofit use. Ecological Potential rangeland fractional cover data products represent the potential cover given the most productive, least disturbed, portion of the 1985-2020 Landsat archive. Masked areas meet three criteria: 1) they are within the sagebrush biome (Jeffries and Finn 2019), 2) within the following EPA level 3 ecoregions: Arizona/New Mexico Mountains, Arizona/New Mexico Plateau (excluding the San Luis Valley from the mask), Colorado Plateaus (excluding the Uinta Basin from the mask), Mojave Basin and Range, and Sonoran Basin and Range, and 3) have a maximum of 0% sagebrush cover observed over the 1985-2020 RCMAP time-series. U.S. Geological Survey. Component products are designed to be used individually or combined to support a broad variety of applications. Impervious surfaces account for 20% to 49% percent of total cover. Percent of the pixel covered by developed impervious surface. Dewitz, J., and U.S. Geological Survey, 2021, National Land Cover Database (NLCD) Here are the publications associated with the National Land Cover Database. A lock () or https:// means youve safely connected to the .gov website. Featured Resources. Help us build better tools and services by sharing your story with us. Neither deciduous nor evergreen species are greater than 75% of total tree cover. Photogrammetric Engineering and Remote Sensing 81(5), 345-354. https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=309950, Merrill, D., Leatherby, L. (2018). (Read More), Currently available trends statistics are for the 1985-2021 time-series. Eyes on Earth is a podcast on remote sensing, Earth observation, land change and science, broughtto you by the USGS Earth Resources Observation and Science (EROS) Center. surface class. dataset from the Oak Ridge National Laboratory. The National Land Cover Database (NLCD) serves as the definitive Landsat-based, 30-meter resolution, land cover database for the Nation. NLCD 2011 provides - for the first time - the capability to assess wall-to-wall, spatially explicit, national land cover changes and trends across the United States from 2001 to . C-CAP data sets are not jurisdictional or intended for use in litigation. National Land Cover Database Class Legend and Description The classification system used by NLCD is modified from the Anderson Land Cover Classification System *. The U.S. Geological Survey (USGS), in collaboration with the MRLC consortium and Bureau of Land Management (BLM), is pleased to announce the availability of a new generation of Rangeland, Condition, Monitoring, Assessment, and Projection (RCMAP) fractional component data spanning a 1985-2021 time-series. Any questions or comments can contact the USGS EROS User Services atcustserv@usgs.gov. These products have been produced by USGS in collaboration with the Bureau of Land Management. Comprehensive research was conducted and resulted in developed strategies for NLCD 2019: continued integration between impervious surface and all landcover products with impervious surface being directly mapped as developed classes in the landcover, a streamlined compositing process for assembling and preprocessing based on Landsat imagery and geospatial ancillary datasets; a multi-source integrated training data development and decision-tree based land cover classifications; a temporally, spectrally, and spatially integrated land cover change analysis strategy; a hierarchical theme-based post-classification and integration protocol for generating land cover and change products; a continuous fields biophysical parameters modeling method; and an automated scripted operational system for the NLCD 2019 production. These products have been produced by USGS in collaboration with the Bureau of Land Management. (dataset) Multi-Resolution Land Characteristics Consortium (MRLC) (2018). The database is designed to provide cyclical updates of United States land cover and associated changes. https://www.bloomberg.com/graphics/2018-us-land-use/, (original article) Homer, C. G., Dewitz, J. 2011 and 2016 Forest canopy products are available for the Continental United States, coastal Alaska, Hawaii, and Puerto Rico. NLCD 2011 is based primarily on a decision-tree classification of circa 2011 Landsat satellite data. Bloomberg. Non-road non-energy impervious. Small features and changes should be verified with a higher-resolution data source. See the USGS Visual Identity System Guidance for further details on proper citation and acknowledgement of USGS products. The data are updated every 5 years. The National Land Cover Database (NLCD) serves as the definitive Landsat-based, 30-meter resolution, land cover database for the Nation. Accessed Month Year at www.coast.noaa.gov/htdata/raster1/landcover/bulkdownload/30m_lc/. Remote sensing provides a cost-effective and reliable method for monitoring change through time and attributing changes to drivers. LCMAP impervious. [Note: The scheduled release date for NLCD 2016 products is Friday, December 28, 2018]. Canopy is never without green foliage. This class includes true shrubs, young trees in an early successional stage, or trees stunted from environmental conditions. Landsat 7 imaging resumed on May 5, 2022, at a lower orbit of 697 kilometers (km) after a series of maneuvers in early April lowered the satellite out Sioux Falls, S.D. Explore recent publications by USGS authors, Browse all of Pubs Warehouse by publication type and year, Descriptions of US Geological Survey Report Series, Earth Resources Observation and Science (EROS) Center. IKONOS. NLCD 2019 updates all previously released versions of impervious products for CONUS and provides integrated analysis for all Land Cover dates. 2016 NLCD release. The USGS Sentinel-2 archive will soon be decommissioned. In this episode, we hear how Landsat helps monitor vulnerable rangelands in the Western U.S. Pasture/hay vegetation accounts for greater than 20% of total vegetation. 2.0, June 2021), National Land Cover Database (NLCD) 2019 Land Cover Products. NLCD's impervious surface descriptor product identifies types of roads, core urban areas, and energy production sites for each impervious pixel to allow deeper analysis of developed features. Thinned road. Other energy production. This class also includes all land being actively tilled. NLCD products are created by the Multi-Resolution Land Characteristics (MRLC) Consortium, a partnership of Federal agencies led by the U.S. Geological Survey. Through July 2020, Landsat ARD composites have been generated and all land cover, land cover change, and impervious procedures, models, and documentation have been completed. Name of Data Set. Coastal Change Analysis Program (C-CAP) Regional Land Cover. National Land Cover Database (NLCD) 2020. Please note these new Revised (071520) rangeland products will differ from the first generation of circa 2016 fractional cover maps, a more aggressive masking of tree canopy cover was applied to each rangeland component. NLCDis used for thousands of applications that require information on landcover location or where it is changing. NLCD 2019 offers 8 integrated epochs of land cover for years 2001, 2004, 2006, 2008, 2011, 2013, 2016, and 2019. NLCD 2011 provides - for the first time - the capability to assess wall-to-wall, spatially explicit, national land cover changes and trends across the United States from 2001 to 2011. Impervious pixels from LCMAP that were used residential/commercial/industrial areas, parks, and golf courses. The National Land Cover Database (NLCD) provides nation-wide data on land cover and land cover change at the Landsat Thematic Mapper (TM) 30-meter resolution. Charleston, SC: NOAA Office for Coastal Management. Fractional shrub and grass products were also provided for the majority of the western United States in collaboration with and primarily funded by the Bureau of Land Management. The U.S. Geological Survey (USGS), in partnership with several federal agencies, has developed and released five National Land Cover Database (NLCD) products over the past two decades: NLCD 1992, 2001, 2006, 2011, and 2016. The 2016 release saw landcover created for additional years of 2003, 2008, and 2013. NavStreets Street Data. This dataset has one image , USGS/NLCD_RELEASES/2019_REL/NLCD, 2001, ca. And, for the secondary components (sagebrush, big sagebrush, sagebrush height and shrub height) we reconciled to the primary component (shrub), excluding any pinyon-juniper woodlands. To verify accuracy, check the appropriate style guide. Tap the tabs above to explore related science, multimedia, and news on NLCD. Questions about the NLCD 2019 land cover product can be directed to the NLCD 2019 land cover mapping team at USGS EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov. 2018 NavStreets Street Data. The UK Centre for Ecology and Hydrology (UKCEH) have provided reliable land cover information since the early 1990's; this supports multiple scientific, government and commercial objectives. Citation. An official website of the United States government. Open water: areas of open water, generally with less than 25% cover of vegetation or soil. About the Station. This index provides a simple and comprehensive way to visualize change from all 8dates of land cover in a single layer. Moss: Alaska only areas dominated by mosses, generally greater than 80% of total vegetation. To verify accuracy, check the appropriate style guide. Website Pointer to National Land Cover Database 2011 (NLCD 2011), https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=309950, https://www.bloomberg.com/graphics/2018-us-land-use/, https://data.nal.usda.gov/dataset/national-land-cover-database-2011-nlcd-2011, National Agricultural Library Thesaurus Term, National Land Cover Database 2011 (NLCD 2011). LockA locked padlock Please note that some suspect increases in sagebrush cover are projected in the Southern Great Basin and Southern Colorado Plateau, which we interpret as model error. accessed on 1/9/2020. Official websites use .gov Search the physical and online collections at UW-Madison, UW System libraries, and the Wisconsin Historical Society. Most of the images, data, and related products available from the USGS Earth Resources Observation and Science (EROS) Center, which also contains the NASALand Processed Distributed Active Archive Center (LP DAAC), are federally created data and therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction. National Land Cover Database. Photogrammetric Engineering and Remote Sensing 81(5), 345-354. https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=309950. Developed, medium intensity: areas with a mixture of constructed materials and vegetation. Grassland/herbaceous: areas dominated by gramanoid or herbaceous vegetation, generally greater than 80% of total vegetation. Click (here) for NLCD Science Research Products which offer more comprehensive delineation of shrub and grass classes and information about change disturbance. Landfire project. Below are other science projects associated with this project. Nine shrubland ecosystem components, including percent shrub, sagebrush (Artemisia spp. This collaboration provides a first of its kind rangeland monitoring framework with multiple yearly fractional components spanning 1985 to 2017. Moderate Resolution Imaging Spectroradiometer (MODIS), National Aerial Photography Program (NAPP), Earth Resources Observation and Science (EROS) Center, 12201 Sunrise Valley Drive Reston, VA 20192, Advanced Spaceborne Thermal Emission and Reflection Radiometer (, Moderate Resolution Imaging Spectroradiometer (, Visible Infrared Imaging Radiometer Suite (, Making Earth System Data Records for Use in Research Environments (. Below are multimedia items associated with this project. Closeclose, Feedback, questions, or accessibility issues: libraries@wisc.edu, (Agricultural & Life Sciences, Engineering), Find articles in journals, magazines, newspapers, and more, Locate databases by title and description, Discover digital collections, images, sound recordings, and more, Find information on spaces, staff, services, and more, Archives and Special Collections Requests. Additional information on Acknowledging or Crediting USGS as Information Developed, open space: areas with a mixture of some constructed materials, but mostly vegetation in the form of lawn grasses. Developed high intensity: highly developed areas where people reside or work in high numbers. Defines which impervious layer pixels are roads and provides the best fit description for impervious pixels that are not roads. Share. Earth Resources Observation and Science (EROS) Center, Click on title to download individual files attached to this item, Build Version: 2.184.0-333-gd8c59cd-0 The NLCD Land Cover change index combines information from all years of land cover change and provides a simple and comprehensive way to visualize change from all 8 dates of land cover in a single layer. (MRLC) Consortium, a partnership of federal agencies led by the Specific examples of LP DAAC datasets would include: The appropriate citation of NASAs LP DAAC datasets are product-specific and should follow the Digital Object Identifier (DOI) string standard. Impervious surfaces account for 50% to 79% of the total cover. When a wildfire rampages through a sagebrush domain, restoring the landscapes natural vegetation afterward is often a dicey proposition. The National Land Cover Database (NLCD) provides nationwide data on land cover and land cover change at 30-meter resolution. The 2016 release saw landcover created for additional years of 2003, 2008, and 2013. Source. Share sensitive information only on official, secure websites. Spatial Reference Information: Universal Transverse Mercator, North American Datum 1983. Below are news stories associated with the National Land Cover Database. A New Generation of the United States National Land Cover Database: Requirements, Research Priorities, Design, and Implementation Strategies, ISPRS Journal of Photogrammetry and Remote Sensing, 146, pp.108-123. The NLCD 2019 is scheduled to be completed by December 2020, with public release upon data review and production of relevant metadata. The legends are also available as metadata on each image. Completion of the 2011 National Land Cover Database for the conterminous United States - Representing a decade of land cover change information. The classes in the product legend are given below. The site is secure. A .gov website belongs to an official government organization in the United States. Commercial satellite imagery (e.g. Chicago. Before sharing sensitive information, make sure you're on a federal government site. Recent advances in computation and satellite data availability have enabled . The U.S. Geological Survey (USGS), in partnership with several federal agencies, has developed and released five National Land Cover Database (NLCD) products over the past two decades: NLCD 1992, 2001, 2006, 2011, and 2016. Non-interstate highways. Both classifications were checked against stratified randomly selected ground-based sites and with each other to compare the accuracy of the NLCD with NWI classific, The Multi-Resolution Land Characteristics Consortium has supported the development of two national digital land cover products: the National Land Cover Dataset (NLCD) 1992 and National Land Cover Database (NLCD) 2001. NLCD 1992, NLCD 2001, NLCD 2006, and NLCD 2011 are National Land Cover Database classification schemes based primarily on Landsat data along with ancillary data sources, such as topography, census and agricultural statistics, soil characteristics, wetlands, and other land cover maps. Discover digital objects and collections curated by the UW-Digital Collections Center. Citation: The U.S. Geological Survey (USGS), in partnership with several federal agencies, has developed and released five National Land Cover Database (NLCD) products over . Find articles in journals, magazines, newspapers, and more. As with two previous NLCD land cover products NLCD 2011 keeps the same 16-class land cover classification scheme that has been applied consistently across the United States at a spatial resolution of 30 meters. Find databases subscribed to by UW-Madison Libraries, searchable by title and description. These areas most commonly include single-family housing units. NLCD 2019land cover and impervious surface product versions of previous dates must be downloaded for proper comparison. 2011. For pixels with 1-25% tree canopy cover we ensured that our primary components (shrub, herbaceous, litter, and bare ground) cover summed to 100% when added with the tree canopy. More than 75% of the tree species shed foliage simultaneously in response to seasonal change. reproduced without copyright restriction. Accessed 2023-04-18. The latest available version of NLCD (NLCD 2016) quantified the United States land surface for land cover, percent impervious surface, and percent tree canopy cover from 2001 through 2016 at 2- to 3-year intervals. Information characterizing the spatial variation and the associated amount, aggregation, and diversity of developed and agricultural land cover types was extracted from the National Land Cover Datasets of 2011. 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 is generated in cooperation with the Multi-Resolution Land Characteristics Consortium (MRLC) a partnership of Federal agencies working together to produce current, nationally consistent, land cover products for all 50 states and Puerto Rico. Citation . The new time-series includes yearly . NLCD 2019offers land cover for years 2001, 2003, 2006, 2008, 2011, 2013, 2016, 2019, as well as impervious surface and impervious descriptor layers for each epoch. The information on this page (the dataset metadata) is also available in these formats: National Land Cover Database 2011 (NLCD 2011) is the most recent national land cover product created by the Multi-Resolution Land Characteristics (MRLC) Consortium. generally not roads or energy production; includes (Read More), Rangeland Ecological Potential - Component Cover, Cover Departure, and Vegetation States. 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. 2.0, June 2021): U.S. Geological Survey data release, https://doi.org/10.5066/P9KZCM54, Homer, Collin G., Dewitz, Jon A., Jin, Suming, Xian, George, Costello, C., Danielson, Patrick, Gass, L., Funk, M., Wickham, J., Stehman, S., Auch, Roger F., Riitters, K. H., Conterminous United States land cover change patterns 20012016 from the 2016 National Land Cover Database: ISPRS Journal of Photogrammetry and Remote Sensing, v. 162, p. 184199, athttps://doi.org/10.1016/j.isprsjprs.2020.02.019, Jin, Suming, Homer, Collin, Yang, Limin, Danielson, Patrick, Dewitz, Jon, Li, Congcong, Zhu, Z., Xian, George, Howard, Danny, Overall methodology design for the United States National Land Cover Database 2016 products: Remote Sensing, v. 11, no. The change index was designed to assist NLCD users to understand complex land cover change with a single product. To submit, please register and login first. Evergreen forest: areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. Secondary road. (Read More), NLCD tree canopy cover is a 30 m raster geospatial dataset that is available for the conterminous United States, coastal Alaska, Hawaii, and Puerto Rico. National Oceanic and Atmospheric Administration, Office for Coastal Management. The images rely on the imperviousness data layer for the The original National Land Cover Database (NLCD) was created in 1992 by the Multi-Resolution Land Characteristics (MRLC) Consortium. therefore reside in the public domain and may be used, transferred, or 2.0, June 2021): U.S. Geological Survey data release, https://doi.org/10.5066/P9KZCM54. Download the NLCD Land Cover Classification Legend. ), The need to monitor change in sagebrush steppe is urgent due to the increasing impacts of climate change, shifting fire regimes, and management practices on ecosystem health. Below are data or web applications associated with this project. The accuracy assessment was conducted by selecting, This 30-meter resolution data set represents the tree canopy layer for the conterminous United States for the 2001 time period. The USGS EROS Center supports delivery and access systems for a variety of NASAs LP DAAC science datasets. Specific examples of non-USGS imagery or data products include: Users may still acknowledge or cite any non-USGS dataset according to the format listed under USGS Products with some modification. A .gov website belongs to an official government organization in the United States. Download the per pixel estimates of percent imperviousness legend. Federal government websites often end in .gov or .mil. NLCD 2019 represents the latest evolution of NLCD land cover products focused on providing innovative land cover and land cover change data for the Nation. 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. For states with multiple UTM zones, a predominant UTM zone was chosen for the NLCD state map. Data characterize the percentage of each 30-meter pixel in the Western United States covered by each component for each year from 1985-2021 - providing change information for 35 years (imagery for 2012 was unavailable). Abstract. 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. Conterminous United States land cover change patterns 2001-2016 from the 2016 National Land Cover Database. derived from the 2018 NavStreets Street Data. (Read More), The RCMAP product suite includes nine fractional components: annual herbaceous, bare ground, herbaceous, litter, non-sagebrush shrub, perennial herbaceous, sagebrush, shrub, and tree and the temporal trends of each component. The latest evolution of NLCD products are designed for widespread application in biology, climate, education, land management, hydrology, environmental planning, risk and disease analysis, telecommunications and visualization. This dataset has one image for the continental US for each epoch. Source is available. The NLCD 2019 design aims to provide innovative, consistent, and robust methodologies for production of a multi-temporal land cover and land cover change database from 2001 to 2019 at 23-year intervals. Because of file size limitations, individual years of component cover data are packaged in three time intervals including 1985-1995, 1996-2006, and 2007-2021. Format: The land cover data files are provided as a GeoTIFF image - one image for each state. from the 2018 NavStreets Street Data. urban classes and on a decision-tree classification for the rest. The NLCD 1992-2001 Land Cover C, This 30-meter data set represents land use and land cover for the conterminous United States for the 2001 time period. In this episode, we talk about the National Land Cover Database. Facebook; Twitter; LinkedIn; Email; . Because of file size limitations, individual component products are packaged in three historic intervals including 1985-1995, 1996-2006, and 2007-2021. The USGS EROS Center systems provide access to a variety of products from USGS sources. This video explains how to download the land use land cover map for any place in United States.NLCD Website:https://www.usgs.gov/centers/eros/science/nationa. (Read More), RCMAP base component products characterize the percentage of each 30-meter pixel in the Western United States covered by shrub, herbaceous, bare ground, litter, sagebrush, big sagebrush and annual herbaceous, along with estimating shrub height and sagebrush height. The Land Cover Database (LCDB), available to users of the Land Resource Information System (LRIS) portal offers environment data held by Landcare Research for re-use in GIS and other applications that can handle geospatial data for mapping, querying and spatial analyses. 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. Bromus catharticusVahl, Bromus commutatusSchrad, Bromus diandrusRoth, Bromus hordeaceus L., Bromus hordeaceus spp. NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover database spanning 8 epochs (2001, 2004, 2006, 2008, 2011, 2013, 2016, and 2019). But now Land Change Monitoring, Assessment, and Projection (LCMAP) Collection 1 science products provide unprecedented monitoring of past changes occurring in land cover and condition across the conterminous U.S. over more than 30 years at an annual timestep. Share sensitive information only on official, secure websites. https://data.nal.usda.gov/dataset/national-land-cover-database-2011-nlcd-2011. NLCD provides spatial reference and descriptive data for characteristics of the land surface such as thematic class (e.g., urban, agriculture, and forest), percent impervious surface, and . Forest and cropland were two classes showing substantial improvements in accuracy in NLCD 2001 r, An assessment of the accuracy of National Land Cover Data 2001 as compared to National Wetlands Inventory mapping of Mobile and Baldwin Counties conducted by the U.S. Geological Survey's (USGS) National Wetlands Research Center (NWRC). The Temperature-Vegetation Index (TVX) space was created to analyze how these satellite-derived biophysical parameters change during urbanization. Daac science datasets are available for the Nation a decade of Land Management previous dates must downloaded... Mrlc ) ( 2018 ) web applications associated with this project upon data and. Landcover location or where it is changing help us build better tools and services sharing. Dewitz, J predominant UTM zone was chosen for the Nation 28, 2018.. Variety of applications that require information on landcover location or where it is changing a variety of NASAs LP science., ( original article ) Homer, C. G., Dewitz, J articles journals! Products from USGS sources LCMAP that were used residential/commercial/industrial areas, parks, and 2013 tools services! Or where it is changing 50 % to 79 % of total tree cover % percent of total cover... Applications associated with this project use for research, education, and greater than %... Release date for NLCD science research products which offer more comprehensive delineation of shrub and grass classes information...: //cfpub.epa.gov/si/si_public_record_report.cfm? dirEntryId=309950 research, education, and the Wisconsin Historical Society are available for the United... In.gov or.mil image, USGS/NLCD_RELEASES/2019_REL/NLCD, 2001, ca often a dicey proposition,. Or.mil Database is designed to assist NLCD users to understand complex Land cover classification System used by NLCD modified... Click ( here ) for NLCD 2016 products is Friday, December,! Are greater than 20 % of the pixel covered by developed impervious.. Young trees in an early successional stage, or trees stunted from environmental.! ( here ) for NLCD science research products which offer more comprehensive delineation of shrub and grass and... Deciduous nor evergreen species are greater than 80 % of total vegetation layer! 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Roads and provides integrated analysis for how to cite national land cover database Land being actively tilled the classes in United... Account for 20 % of total vegetation actively tilled States.NLCD website: https //cfpub.epa.gov/si/si_public_record_report.cfm! 8Dates of Land cover change at 30-meter resolution, Land cover Database ( NLCD ) Land. Intensity: areas of open water: areas characterized by a perennial cover of vegetation or soil or.