national digital elevation model

Collaboration is a key factor to the success of the National Elevation Data Strategy. The high-resolution Radarsat Antarctic Mapping Project (RAMP) Digital Elevation Model (DEM) combines topographic data from a variety of sources to provide consistent coverage of all of Antarctica. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. Access & Use Information. Although medium scale mapping has been done for the entire territory of Indonesia, there has never been a DEM unification to produce seamless national DEM. Primarily used for portraying declination data (magnetic north) on maps and charts. Digital Elevation Models for the Global Change Research Wetland, Maryland, USA, 2016. High-Resolution Elevation Models for France and Overseas – Now in windPRO. Regional Digital Elevation Models. Digital Surface Model (DSM): [file format] A digital surface model is an elevation that includes the top of buildings, tree canopy, powerlines and other features above the bare earth. The Hillshade (Shaded Relief) dataset is a derived product from the USGS National Elevation Dataset. Scientists and resource managers use 3DEP data for hydrologic modeling, … Scientists and resource managers use 3DEP data for hydrologic modeling, resource … Digital elevation models (DEMs) of U.S. coasts that integrate ocean bathymetry and land topography to support NOAA's mission to understand and predict changes in Earth's environment, and conserve and manage coastal and marine resources to meet our Nation's economic, social, and environmental needs. The 3 m Resolution Lidar Digital Elevation Model (DEM) is the primary elevation data product produced and distributed by the National Park Service, Great Smoky Mountains National Park. The National Centers for Environmental Information (NCEI) builds high-resolution coastal digital elevation models (DEMs) to support NOAA's mission to understand and predict changes in Earth's environment and conserve and manage coastal and marine resources to meet our Nation's economic, social and environmental needs. The DEM has a grid spacing of nine seconds in latitude and longitude (approx 250 metres). The high-resolution Radarsat Antarctic Mapping Project (RAMP) Digital Elevation Model (DEM) combines topographic data from a variety of sources to provide consistent coverage of all of Antarctica. 1 Arc-second Digital Elevation Models (DEMs) - USGS National Map Licence Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied, is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The term DEM was introduced in the 1970s with the purpose of distinguishing the simplest form of terrain relief modelling from more complex types of digital surface representation. These surveys cover Australia's populated coastal zone; floodplain surveys within … The model coefficients, and other products are available via anonymous FTP to cddis.gsfc.nasa.gov (cd to the directory pub/egm96/general_info/). Coronavirus and USDA Assistance for Farmers. Dennis G. Milbert, Ph.D. and Dru A. Smith, Ph.D. National Geodetic Survey, NOAA ABSTRACT. A digital elevation model (DEM) is a 3D CG representation of a terrain's surface – commonly of a planet (e.g. Earth), moon, or asteroid – created from a terrain's elevation data. National Digital Elevation Data. A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. These data may be used as the source of updates to the seamless layers of the 3D Elevation Program, which serves as the elevation layer of the National Map. Regional Digital Elevation Models. The DEM data are stored as a series of profiles in which the spacing of the elevations along and between each profile is in … GSI, 1995. The NED is a seamless mosaic of best-available elevation data. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and warning efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and modeling efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). Title: Digital Elevation Model for Wyoming at 10 meters Geospatial Data Presentation Form: SDE raster digital data ... Abstract: The National Elevation Dataset (NED) is the primary elevation data product produced and distributed by the USGS. The accepted framework layer for elevation in Montana is the USGS National Elevation Dataset. United States Geological Survey 3D Elevation Program 1 arc-second Digital Elevation Model. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. National Elevation Dataset 1999 (raster) Read more; NWA Lidar Digital Elevation Model 2004 (raster) Read more; NWA Lidar Digital Elevation Model- Float 2004 (raster) Read more; Pulaski County 2 Foot Contours: 2010-2011 (line) Read more ← Previous 1 2. Raster datasets include: Digital Elevation Models (DEMs), Orthoimagery, and Land Cover. The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. This digital elevation model (DEM) is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer. Those are being systematically replaced with DEMs derived from high-resolution lidar and … The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. Digital Database on the World Wide Web World Wide Web and CD-ROMs. A digital elevation model (DEM) is a 3D computer graphics representation of elevation data to represent terrain, commonly of a planet, moon, or asteroid.A "global DEM" refers to a discrete global grid.DEMs are used often in geographic information systems, and are the most common basis for digitally produced relief maps.. 2018, 2019) SRTM 1 arc-second DEM data are also available for the United States. Telephone: +1 (865) 241-3952. This is the most recent version of these data. NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. Printing Digital Elevation Models in 3D. A digital elevation model (DEM) is a digital representation of ground surface topography or terrain.It is also widely known as a digital terrain model (DTM).While the term can be used for any representation of terrain as GIS data, it is generally restricted to the use of a raster grid of elevation values. Most 1-degree DEM are produced by the National Imagery and Mapping Agency (NIMA) from cartographic and photographic sources. SRTM 1 arc-second DEM data are also available for the United States. NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. The National Map Seamless Digital Elevation Model Specifications Chapter 9 of Section B, U.S. Geological Survey Standards, of Book 11, Collection and Delineation of Spatial Data Techniques and Methods 11–B9 U.S. Department of the Interior U.S. Geological Survey National Oceanic and Atmospheric Administration, National Geophysical Data Center, 325 Broadway, Boulder, Colorado 80303, USA. USGS 1 arc-second Digital Elevation Model Overview This is a 1 arc-second (approximately 30 m) resolution tiled collection of the 3D Elevation Program (3DEP) seamless data products . A 30-arc-second (1-km) gridded, quality-controlled global Digital Elevation Model (DEM). The USGS is making this … The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. The product High Resolution Digital Elevation Model (HRDEM) is part of the CanElevation Series created in support to the National Elevation Data Strategy implemented by NRCan. The World Magnetic Model (WMM) is a set of data, software and charts used to characterize, depict, and predict various properties of the earth's magnetic field. NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. Description. The ASTER Global Digital Elevation Model (GDEM) Version 3 (ASTGTM) provides a global digital elevation model (DEM) of land areas on Earth at a spatial resolution of 1 arc second (approximately 30 meter horizontal posting at the equator). The Canadian Digital Elevation Model (CDEM) is part of Natural Resources Canada's altimetry system designed to better meet the users' needs for elevation data and products. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. SRTM-derived 1 Second Digital Elevation Models Version 1.0 The national 1 second (~30m) DEMs suite contains three publicly released national models; Digital Elevation Model (DEM), Smoothed DEM (DEM-S) and Hydrologically Enforced DEM (DEM-H). This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution.The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use 3DEP data for hydrologic modeling, resource … Digital elevation models (DEMs) of U.S. coasts that integrate ocean bathymetry and land topography to support NOAA's mission to understand and predict changes in Earth's environment, and conserve and manage coastal and marine resources to meet our Nation's economic, social, and environmental needs. The physical format of each digital elevation model is validated for content completeness and logical consistency during production quality control and prior to archiving in the National Digital Cartographic Data Base. Have you ever wanted to make a 3D print of your favorite mountain peak, city-scape, or tourist destination? With an ever growing demand for digital elevation data by Federal, state, and local governments, the National Digital Elevation Program (NDEP) was established to promote the exchange of digital elevation data among government, private, and non-profit sectors and the academic community, and to establish standards and guidance that The vector datasets include: The National Hydrography Dataset(s), Watershed Boundary Dataset, Governmental Boundary Units, Transportation, Structures, Elevation Contours and Geographic Names. Digital terrain modeling (DTM), also known as digital elevation modeling, is the practice of creating a digital representation of ground topography and terrain. Digital Earth Australia Intertidal Elevation (previously known as National Intertidal Digital Elevation Model or NIDEM) Date: March 2019 Author: Robbi Bishop-Taylor, Stephen Sagar, Leo Lymburner (Digital Earth Australia, Geoscience Australia) License: CC BY Attribution 4.0 International License Data availability Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. Users assume responsibility to determine the usability of these data. Important News to Know. The elevations in this Digital Elevation Model (DEM) represent the topographic bare-earth surface. In support of ongoing efforts to provide efficient, cloud ready, open data formats, the U.S. Geological Survey National Geospatial Program is announcing plans to migrate its 3D Elevation Program (3DEP) Digital Elevation Models (DEM) to a new data delivery format called Cloud Optimized Geotiff (COG) during the first half of fiscal year 2020. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. ASTER Global Digital Elevation Map Announcement. This is the Original Product Resolution (OPR) Digital Elevation Model (DEM) as provided to the USGS. The CDEM stems from the existing Canadian Digital Elevation Data (CDED). These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC). For much of the United States, the National Elevation Dataset contains 1 arc-second and 1/3 arc-second (~30 m and 10 m, respectively) resolution data. degree DEM consists of a one square degree of elevation data at a grid or post spacing of 3 arc seconds. USGS DEMs used to be derived primarily from topographic maps . PROTOTYPE OF NATIONAL DIGITAL ELEVATION MODEL IN INDONESIA Danang B. Susetyo 1, Yustisi A. Lumban-Gaol 1, Ibnu Sofian 1 1 Geospatial … 1 meter Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection Metadata Updated: December 11, 2021 This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution.The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for … The main problem to generate national DEM is multi-data-sources. Two datasets were used to create the DEM: The NOAA Office for Coastal Management (OCM) high-resolution seamless raster elevation dataset (https://coast.noaa.gov/slr/) information product which is indispensable for national. develo pment. The model is produced at 5-year intervals, with the current model expiring 31 Dec 2019. The goal of the 3D Elevation Program (3DEP) is to complete nationwide data acquisition in 8 years, by 2023, to provide the first-ever national baseline of consistent high-resolution three-dimensional data—including bare earth elevations and three-dimensional point clouds—collected in a timeframe of less than a decade. Digital elevation models (DEMs) are useful tools to describe the morphology and evolution of physical landscapes. 501 Woodlane Street Ste G4 Little Rock, AR 72201 The digital elevation models, or DEMs, are the first data released as part of the EarthDEM Project, a collaboration between PGC, the Byrd Polar Research Center at The Ohio State University, the National Center for Supercomputing Applications at the University of Illinois, and government partners to produce high-resolution terrain maps for temperate and tropic regions. ASTER Global Digital Elevation Map Announcement. PROTOTYPE OF NATIONAL DIGITAL ELEVATION MODEL IN INDONESIA. The Global Positioning System (GPS) is commonly considered a three-dimensional system. The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (ASTGTM) was developed jointly by the U.S. National Aeronautics and Space Administration (NASA) and Japan’s Ministry of Economy, Trade, and Industry (METI). The lidar Digital Elevation Model (DEM) is the primary elevation data product produced and distributed by the National Park Service, Great Smoky Mountains National Park. Converting GPS Height into NAVD88 Elevation with the GEOID96 Geoid Height Model. The Global Land One-kilometer Base Elevation (GLOBE) Digital Elevation Model, Version 1.0. OpenTopography has created a video tutorial that demonstrates how to prepare a digital elevation model (DEM) for 3D printing. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and warning efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). This is the first version of documentation for the Global Land One-kilometer Base Elevation (GLOBE) data set. A digital elevation model (DEM) is a 3D computer graphics representation of elevation data to represent terrain, commonly of a planet, moon, or asteroid.A "global DEM" refers to a discrete global grid.DEMs are used often in geographic information systems, and are the most common basis for digitally produced relief maps.. Digital Elevation Model (DEM) In general, a DEM is any raster representation of a terrain surface. An accurate digital elevation model (DEM) takes considerable time, resources, and expertise to develop and is required to compute inundation. Australia's future safety, prosperity and sustainability depends on making informed policy and investment decisions that meet the needs of today, and the decades ahead. on production of topographic map quadrangle-based digital elevation models. Digital Elevation Model Data. These 1 second products are a significant improvement on the Shuttle Radar Topographic Mission (SRTM) … the 1-Meter Digital Elevation Model data product. DEM data can be used for urban planning, disaster. Digital Elevation Model (DEM) is one of basic geospatial. Prototype of National Digital Elevation Model in Indonesia Susetyo, D. B.; Lumban-Gaol, Y. arc-second (10 meter ground spacing) digital elevation model data. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. A Digital Elevation Model (DEM) is a digital model or three dimensional (3D) representation of a terrain's surface created from elevation data. This is a tiled collection of the 3D Elevation Program (3DEP) and is 2 arc-second (approximately 60 m) resolution covering Alaska. Current ISSN 2449-8866 Research Article Life Sciences Development of digital elevation model for Okomu National Park, Nigeria Onyekachi Chukwu*1, Akintunde A. Alo1, Jacinta U. Ezenwenyi1,2 1 Department of Social and Environmental Forestry, University of Ibadan, Ibadan, Nigeria 2 Department of Forestry and Wildlife, Nnamdi Azikiwe University, Awka, Nigeria … Geo327G/386G: GIS & GPS Applications in Earth Sciences Jackson School of Geosciences, University of … To reduce duplication of effort this data will no longer be available directly from the Montana State Library. Dataset Acknowledgement: U.S. Geological Survey, 2017, 1 Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection: U.S. Geological Survey. NOAA National Centers for Environmental Information. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and modeling efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). 30 arc-second digital elevation model of Japan. A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. Current ISSN 2449-8866 Research Article Life Sciences Development of digital elevation model for Okomu National Park, Nigeria Onyekachi Chukwu*1, Akintunde A. Alo1, Jacinta U. Ezenwenyi1,2 1 Department of Social and Environmental Forestry, University of Ibadan, Ibadan, Nigeria 2 Department of Forestry and Wildlife, Nnamdi Azikiwe University, Awka, Nigeria … March 26, 2021. Continuously Updated Digital Elevation Model (CUDEM) - 1/9 Arc-Second Resolution Bathymetric-Topographic Tiles. Digital elevation models (DEMs) represent a fundamen-tal resource in geomorphological analysis. DEMs are commonly built using remote sensing techniques, but they … The Land Change Monitoring, Assessment, and Projection (LCMAP) project has generated an integrated suite of annual land cover and land surface change products for the United States based on time series data from the Landsat record from 2000–2020. This is a tiled collection of the 3D Elevation Program (3DEP) covering Alaska only, and is 5-meter resolution. An architectural drawing or architect's drawing is a technical drawing of a building (or building project) that falls within the definition of architecture.Architectural drawings are used by architects and others for a number of purposes: to develop a design idea into a coherent proposal, to communicate ideas and concepts, to convince clients of the merits of a design, to assist a … Conservation Compliance. NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. The user is responsible for the results of any application of this data for other than its intended purpose., Cite as: NOAA National Geophysical Data Center. USDA NRCS - Natural Resources Conservation Service. Digital Elevation Model (DEM) is an invention that has liberated gathering and storing of elevation data from the principles of traditional cartography. A Digital Elevation Model (DEM) is a digital model or three dimensional (3D) representation of a terrain's surface created from elevation data. The U.S. Geological Survey has developed a National Elevation Dataset (NED). A.; Sofian, I. Abstract. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and warning efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). The model is at 5m grid resolution with derived 10m contour lines. This month, 5m and 25m grid-resolution digital terrain models (DTM’s) or MNT’s (Modèle Numérique de Terrain) for France and its overseas territories were released with windPRO. Dataset Citation: United States Geological Survey (2021). DEMs are created from a variety of sources. 7. The U.S. Geological Survey has developed a National Elevation Database (NED). The Ministry of Economy, Trade, and Industry (METI) of Japan and the United States National Aeronautics and Space Administration (NASA) jointly announced the release of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model Version 3 (GDEM 003), and the ASTER … USGS DEMs used to be derived primarily from topographic maps. Figure 7.8.2 Arrangement of elevation profiles in a small scale USGS Digital Elevation Model. The DEMs created for this project were developed using the NOAA National Weather Service's Weather Forecast Office (WFO) boundaries. By reproducing the topographic characteristics and morphological features, DEMs provide a quantitative representation of the Earth's surface. This new product was developed to provide high resolution bare-earth digital elevation models from light detection and ranging (lidar) elevation data and other elevation data collected over the conterminous United States (lower 48 States), Hawaii, and potentially Alaska and the U.S. territories. Digital Elevation Model. GLOBE is an internationally designed, developed, and independently peer-reviewed global digital elevation model (DEM), at a latitude-longitude grid spacing of 30 arc-seconds (30"). NHDPlus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the high resolution National Hydrography Dataset, nationally complete Watershed Boundary Dataset, and 3D Elevation Program (3DEP) ? The increasing availability of open-access DEMs over wide areas is advan-tageous, but requires an evaluation of DEM quality and er-rors. A 30-arc-second (1-km) gridded, quality-controlled global Digital Elevation Model (DEM). Contact for Data Center Access Information: E-mail: uso@daac.ornl.gov. Each software package in the tutorial is freely available for download. Click here to retrieve the Model Coefficients, and other products. The NED serves as the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. The NED is a seamless mosaic of best-available elevation data. Lidar point cloud data is also available over many areas of the US. The National Map seamless digital elevation model specifications Techniques and Methods 11-B9 By: Christy-Ann M. Archuleta , Eric W. Constance , Samantha T. Arundel , Amanda J. Lowe , Kimberly S. Mantey , and Lori A. Phillips Service Description: The USGS 3D Elevation Program (3DEP) Index service from The National Map shows where data is available for two general categories of downloadable elevation data: (1) digital elevation model (DEM) datasets at standardized horizontal resolutions, and (2) elevation source data including that used to produce standard DEMs, and additional datasets derived … 2009: Mobile, Alabama 1/3 MHW Coastal Digital Elevation Model. The DEM data are stored as a series of profiles in which the spacing of the elevations along and between each profile is in … The Global Land One-km Base Elevation Project (GLOBE) Task Team was established by the Committee on Earth Observation Satellites. This The Digital Elevation Model (DEM) 25 Metre Grid of Australia derived from LiDAR model represents a National 25 metre (bare earth) DEM which has been derived from some 236 individual LiDAR surveys between 2001 and 2015 covering an area in excess of 245,000 square kilometres. Before the diffusion of using DEMs, country-wide elevation data was stored on the contour lines in printing plates and paper maps. This is a tiled collection of the 3D Elevation Program (3DEP) covering Alaska only, and is 5-meter resolution. These integrated bathymetric-topographic DEMs are used to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard … DEMs are created from a variety of sources. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and … Digital Elevation Models National Elevation Dataset 14-Oct-21 1. This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution.The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. Level 2 DEM's may contain void areas due to interruptions to contours in the source graphic or DLG. This digital elevation model (DEM) is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer. The National Map seamless digital elevation model specifications Techniques and Methods 11-B9 By: Christy-Ann M. Archuleta , Eric W. Constance , Samantha T. Arundel , Amanda J. Lowe , Kimberly S. Mantey , and Lori A. Phillips Acknowledgements: Contains elevation data from the Institut National de l’Information Geographique et Forestiére (IGN) – 05/2019 & 03/2021 Metadata Updated:March 17, 2021. Digital Elevation Model (DEM) In general, a DEM is any raster representation of a terrain surface. Abstract. For much of the United States, the National Elevation Dataset contains 1 arc-second and 1/3 arc-second (~30 m and 10 m, respectively) resolution data. The Ministry of Economy, Trade, and Industry (METI) of Japan and the United States National Aeronautics and Space Administration (NASA) jointly announced the release of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model Version 3 (GDEM 003), and the ASTER … Data can be downloaded from the USGS National Map Download Platform. NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. The term DEM was introduced in the 1970s with the purpose of distinguishing the simplest form of terrain relief modelling from more complex types of digital surface representation. The Global Land One-km Base Elevation Project (GLOBE) Task Team was established by the Committee on Earth Observation Satellites. These data can be used by scientists and resource managers for global change research, hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. Although medium scale mapping has been done for the entire territory of Indonesia, there has never been a DEM unification to produce seamless national DEM. The DEMs created for this project were developed using the NOAA National Weather Service's Weather Forecast Office (WFO) boundaries. This metadata record describes the Lake Michigan digital elevation model (DEM), which is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Lake Level Viewer described above. Specifically, the U.S. Geological Survey produced a nation-wide DEM called the National Elevation Dataset (NED), which has traditionally served a primary source of elevation data. The major reference for this model is NASA/TP-1998-206861: The Development of the Joint NASA GSFC and NIMA Geopotential Model EGM96, A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects.

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