gov.noaa.ngdc.mgg.dem:737 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Barry W. Eakins Research Scientist mailing and physical address
NOAA/NESDIS/NGDC
325 Broadway, E/GC3
Boulder Colorado 80305-3328 USA 303-497-6505 303-497-6513 Barry.Eakins@noaa.gov 9am-5pm, M-F, Mountain Time Contact NGDC's Marine Geology and Geophysics Division. http://www.ngdc.noaa.gov/mgg/aboutmgg/contacts.html 20090420 Akutan, Alaska Coastal Digital Elevation Model First raster digital data NTHMP DEMs Akutan, Alaska Boulder, Colorado DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce http://www.ngdc.noaa.gov/dem/squareCellGrid/download/737 http://www.ngdc.noaa.gov/dem/squareCellGrid/download/737 Akutan, AK 8/15 arc-second MHHW DEM Download page for accessing DEM, metadata record, and development report. download DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce 20091201 NTHMP DEM Project Raster Digital Data NTHMP DEMs Named by primary coastal city, state in DEM. Boulder, Colorado DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce http://www.ngdc.noaa.gov/mgg/inundation/nthmp/nthmp.html http://www.ngdc.noaa.gov/dem/squareCellGrid/map Map Interface Graphic geo-spatial search tool for locating completed and planned NTHMP tsunami inundation DEMs. search http://www.ngdc.noaa.gov/dem/squareCellGrid/search DEM text search tool Text search tool for locating completed and planned NTHMP tsunami inundation DEMs. search http://www.ngdc.noaa.gov/mgg/inundation/nthmp/nthmp.html NTHMP DEM Project Project web page. information NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. These integrated bathymetric-topographic DEMs are used to support tsunami and coastal inundation mapping. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources, including NGDC, the U.S. National Ocean Service (NOS), the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), the Federal Emergency Management Agency (FEMA), and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to various vertical and horizontal datums depending on the specific modeling requirements of each State. For specific datum information on each DEM, refer to the appropriate DEM documentation. Cell sizes also vary depending on the specification required by modelers in each State, but typically range from 8/15 arc-second (~16 meters) to 8 arc-seconds (~240 meters). Developed for the University of Alaska at Fairbanks (UAF), Geophysical Institute for tsunami and coastal inundation modeling efforts for the State of Alaska. Elliot Lim Barry W. Eakins R. Jason Caldwell 20090420 Digital Elevation Models of Akutan, Alaska: Procedures, Data Sources, and Analysis Boulder, CO DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce 30 pages http://www.ngdc.noaa.gov/dem/squareCellGrid/getReport/737 http://www.ngdc.noaa.gov/dem/squareCellGrid/getReport/737 Digital Elevation Models of Akutan, Alaska: Procedures, Data Sources and Analysis Report describing the development of the Akutan, Alaska DEMs download 1896 2008 ground condition Complete As needed -165.85 -165.67 54.17 54.09 NASA/GCMD Earth Science Keywords Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth Earth Science > Land Surface > Topography > Terrain Elevation Earth Science > Land Surface > Topography > Topographical Relief Earth Science > Oceans > Coastal Processes > Coastal Elevation NASA/GCMD Platform Keywords DEM > Digital Elevation Model NASA/GCMD Data Center Keywords DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce WDC/MGG, BOULDER > World Data Center for Marine Geology and Geophysics, Boulder NASA/GCMD Data Resolution Keywords V: < 1 meter ISO 19115 Topic Category elevation Uncontrolled Coastal Relief Gridded elevations Integrated bathymetry and topography NASA/GCMD Location Keywords Continent > North America > United States of America > Alaska Ocean > Pacific Ocean > North Pacific Ocean Ocean > Pacific Ocean > North Pacific Ocean > Gulf of Alaska Vertical Location > Land Surface Vertical Location > Sea Floor Uncontrolled Akutan NTHMP DEM Gridding Project Digital Elevation Model DEM Light Detection and Ranging LIDAR NTHMP DEM Gridding Project Digital Elevation Model DEM Multibeam Swath Bathymetry System MSBS NTHMP DEM Gridding Project Digital Elevation Model DEM Sound Navigation and Ranging SONAR None. Not to be used for navigational purposes. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Barry W. Eakins Research Scientist mailing and physical address
NOAA/NESDIS/NGDC
325 Broadway, E/GC3
Boulder Colorado 80305-3328 USA 303-497-6505 303-497-6513 Barry.Eakins@noaa.gov 9am-5pm, M-F, Mountain Time Contact NGDC's Marine Geology and Geophysics Division. http://www.ngdc.noaa.gov/mgg/aboutmgg/contacts.html http://www.ngdc.noaa.gov/dem/squareCellGrid/getGraphic/737 Perspective view of DEM JPEG Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.4.1420 gov.noaa.ngdc.mgg.dem:737 Datasets were visually compared internally and externally (with other overlapping datasets and satellite images and maps) in ESRI ArcGIS for identification of anomalous elevations or data inconsistencies. Where elevation inconsistencies occurred, the most recent and/or highest resolution data set was selected for use in that region. Elevations in the older and/or lower-resolution datasets were deleted prior to building the DEM. NGDC made every effort to obtain all available digital topographic and bathymetric datasets in the region for use in building the DEM. The horizontal accuracy of bathymetric and topographic features in the DEM is dependent upon cell size and the accuracy of the input datasets used to determine corresponding cell values. Positional accuracy of input topographic datasets limits accuracy of corresponding cell values in DEM. USGS SRTM DEM: 15 to 30 meters. DEM cell-value relative-contribution factors: NED: 100, SRTM: 10. Bathymetry: several hundred meters. Positional accuracy of input bathymetric datasets limits accuracy of corresponding cell values in DEM. NOS, NOS hydrographic LiDAR and USACE surveys (primarily in dredged shipping channels): about 1 meter. Early 20th-century NOS hydrographic soundings are limited by sparseness of deep-water soundings, and potentially large position accuracy of pre-satellite (i.e., GPS) navigation: tens to several hundreds of meters. Morphologic change in inland rivers and along the coast also degrades the positional accuracy of NOS soundings. Where present, hydrographic LiDAR and USACE survey data supplant NOS hydrographic sounding data values in the DEM. DEM cell-value relative-contribution factors: ENC soundings: 100, USACE surveys: 100, NOS hydrographic soundings: 10, NGDC multibeam sonar surveys: 10, Trackline soundings: 0.1. The vertical accuracy of bathymetric and topographic features in the DEM is dependent upon the accuracy of the input datasets used to determine corresponding cell values. Topography: 10 to 15 meters. Vertical accuracy of input topographic datasets limits accuracy of corresponding cells in DEM. USGS NED DEM: 7 and 15 meters. SRTM DEM: 16 meters. DEM cell relative-contribution factors: SRTM: 10 NED: 100. Bathymetry: 2 meters to 5% of water depth. Vertical accuracy of input bathymetric datasets limits accuracy of corresponding cells in DEM. GPS-navigated NOS, NOS hydrographic LiDAR and USACE surveys (primarily in dredged shipping channels): about 0.1 meter. Early 20th-century NOS hydrographic soundings are limited by sparseness of deep-water soundings, and potentially large position accuracy of pre-satellite (i.e., GPS) navigation: several meters. Where present, USACE survey data supersede NOS hydrographic sounding data values in DEM. DEM cell-value relative-contribution factors: ENC soundings: 100, USACE surveys: 100, NOS hydrographic soundings: 10, NGDC multibeam sonar surveys: 10, Trackline soundings: 0.1. Gridding interpolation to determine cell values between sparse NOS hydrographic soundings in deep water degrades the vertical accuracy of deep-water elevations. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce User Services Mailing and Physical Address
NOAA/NESDIS/NGDC E/GC 325 Broadway
Boulder CO 80305-3328 USA (303) 497-6826 (303) 497-6513 ngdc.info@noaa.gov 7:30 - 5:00 Mountain 2009 NOS Hydrographic Surveys http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html NOS Hydrographic Survey Database Digital database of NOS hydrographic surveys that date back to the late 19th century. download online 1896 2002 ground condition NOS Hydrographic Surveys hydrographic surveys downloaded from web site. DOC/NOAA/NOS/OCS > Office of Coast Survey, National Ocean Service, NOAA, U.S. Department of Commerce DOC/NOAA/NOS/OCS > Office of Coast Survey, National Ocean Service, NOAA, U.S. Department of Commerce Mailing and Physical
Office of Coast Survey NOAA's National Ocean Service 1315 East-West Hwy
Silver Spring MD 20910 USA (301) 713-2780 For questions, go to: http://ocsdata.ncd.noaa.gov/idrs/inquiry.aspx?frompage=ContactUs 2009 Electronic Navigational Charts http://www.nauticalcharts.noaa.gov/mcd/enc/index.htm http://www.nauticalcharts.noaa.gov/mcd/enc/index.htm OCS Electronic Navigational Charts Digital database of NOAA nautical chart information. download online 2009 publication date ENCs downloaded from web site. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce 2009 NGDC Multibeam Surveys http://www.ngdc.noaa.gov/mgg/bathymetry/multibeam.html http://www.ngdc.noaa.gov/mgg/bathymetry/multibeam.html NGDC Multibeam Survey Database Digital database of NGDC multibeam surveys. download online 1999 2004 ground condition NGDC Multibeam Surveys multibeam surveys downloaded from web site. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce 2009 NGDC Trackline Surveys http://www.ngdc.noaa.gov/mgg/bathymetry/geodas/trackline.html http://www.ngdc.noaa.gov/mgg/bathymetry/geodas/trackline.html NGDC Trackline Survey Database Digital database of NGDC Trackline surveys. download online 1913 1991 ground condition NGDC Trackline Surveys Trackline surveys downloaded from web site. DOI/USGS > U.S. Geological Survey, Department of the Interior 2009 USGS NED topography http://ned.usgs.gov/ http://ned.usgs.gov/ USGS National Elevation Dataset Digital database of U.S. topography, in raster form (DEM) download online 2006 publication date USGS NED topography gridded topographic data NASA > National Aeronautics and Space Administration 2009 Shuttle Radar Topography Mission (SRTM) http://srtm.usgs.gov/ http://srtm.usgs.gov/ Shuttle Radar Topography Mission global topography download on web 2000 ground condition NASA SRTM topography gridded topographic data downloaded from web site. All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS84 geographic and Mean Higher High Water, respectively, using FME. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection. 20090115 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Barry W. Eakins Research Scientist mailing and physical address
NOAA/NESDIS/NGDC
325 Broadway, E/GC3
Boulder Colorado 80305-3328 USA 303-497-6505 303-497-6513 Barry.Eakins@noaa.gov 9am-5pm, M-F, Mountain Time Contact NGDC's Marine Geology and Geophysics Division. http://www.ngdc.noaa.gov/mgg/aboutmgg/contacts.html Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency. 20090129 xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 8/15 arc-second grid that interpolated to fill empty cells. Points extracted every 10 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting Arc ASCII grid was imported into ArcGIS and clipped to the coastline to remove values over land. 20090212 xyz files for each input dataset were gridded using MB-System's 'mbgrid' tool, which utilizes a high-tension spline interpolation method to fill grid cells with no input elevation values. Preferential weighting was given to more recent, higher-accuracy datasets. Gridding was performed with a 5% data buffer. The grid was imported in ArcGIS to create the final DEM. 20090226 The DEM was quantitatively evaluated by comparing with source datasets. It was visually evaluated by converting to UTM-zone coordinates (units of meters horizontally and vertically) and then creating a slope grid to identify gridding artifacts in the DEM. 20090312 Raster netCDF Grid Cell 541 1216 1 0.0014814815 0.0014814815 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 Mean Higher High Water 0.01 meters Explicit elevation coordinate included with horizontal coordinates Mean Higher High Water 0.01 meters Explicit depth coordinate included with horizontal coordinates DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Barry W. Eakins Research Scientist mailing and physical address
NOAA/NESDIS/NGDC
325 Broadway, E/GC3
Boulder Colorado 80305-3328 USA 303-497-6505 303-497-6513 Barry.Eakins@noaa.gov 9am-5pm, M-F, Mountain Time Contact NGDC's Marine Geology and Geophysics Division. http://www.ngdc.noaa.gov/mgg/aboutmgg/contacts.html Downloadable Data While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. netCDF 1 netCDF WINZIP 25561 http://www.ngdc.noaa.gov/dem/squareCellGrid/getArchive/737 http://www.ngdc.noaa.gov/dem/squareCellGrid/getArchive/737 Akutan, AK 8/15 arc-second NTHMP DEM DEM, metadata and Readme file for the Akutan, Alaska DEM. download http://www.ngdc.noaa.gov/dem/squareCellGrid/download/737 Akutan, AK 8/15 arc-second MHHW DEM Download page for accessing DEM, metadata record, and development report information None 20110826 20120226 20120826 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Barry W. Eakins Research Scientist mailing and physical address
NOAA/NESDIS/NGDC
325 Broadway, E/GC3
Boulder Colorado 80305-3328 USA 303-497-6505 303-497-6513 Barry.Eakins@noaa.gov 9am-5pm, M-F, Mountain Time Contact NGDC's Marine Geology and Geophysics Division. http://www.ngdc.noaa.gov/mgg/aboutmgg/contacts.html Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata FGDC-STD-012-2002 local time