Southeast Alaska 8 arc-second MHHW Coastal Digital Elevation Model
Thumbnail of DEM
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).
- Cite as: NOAA National Geophysical Data Center. 2010: Southeast Alaska 8 arc-second
MHHW Coastal Digital Elevation Model. NOAA National Centers for Environmental Information.
Accessed [date].
- NCEI Metadata ID: gov.noaa.ngdc.mgg.dem:575
gov.noaa.ngdc.mgg.dem:575
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Search Data |
- DEM text search (search)
Text search for locating completed and planned DEMs.
- Bathymetric Data Viewer (search)
The Bathymetric Data Viewer is an interactive map providing discovery, descriptions,
and download capability for bathymetric survey data and digital elevation models archived
at NOAA's National Centers for Environmental Information (NCEI).
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Download Data |
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Distribution Formats |
- netCDF (Version:4 Classic)
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Ordering Instructions |
Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov
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Dataset Point of Contact |
DEM Information NOAA National Centers for Environmental Information dem.info@noaa.gov
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Time Period |
1883-01-01 to 2010-01-01 |
Spatial Reference System |
urn:ogc:def:crs:EPSG::4326MHHW |
Spatial Bounding Box Coordinates |
West:-138.21
East:-129.19
South:54.19
North:60.01
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Spatial Coverage Map |
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General Documentation |
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Associated Resources |
- Data Stewardship Maturity Report for Southeast Alaska, 8 arc-second MHHW Coastal Digital
Elevation Model
- NTHMP DEM Project
- Bathymetric Data Viewer (search)
The Bathymetric Data Viewer is an interactive map providing discovery, descriptions,
and download capability for bathymetric survey data and digital elevation models archived
at NOAA's National Centers for Environmental Information (NCEI).
- Digital Elevation Models of Juneau and Southeast Alaska: Procedures, Data Sources,
and Analysis
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Publication Dates |
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Edition |
First |
Data Presentation Form |
mapDigital
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Dataset Progress Status |
Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency |
As needed |
Purpose |
Developed for the University of Alaska at Fairbanks (UAF), Geophysical Institute for
tsunami and coastal inundation modeling efforts for the State of Alaska. |
Use Limitations |
- Not to be used for navigation. Although these data are of high quality and useful
for planning and modeling purposes, they are not suitable for navigation. For navigation,
please refer to the NOS nautical chart series.
- Produced by the NOAA National Centers for Environmental Information. Not subject to
copyright protection within the United States.
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Dataset Citation |
- Cite as: NOAA National Geophysical Data Center. 2010: Southeast Alaska 8 arc-second
MHHW Coastal Digital Elevation Model. NOAA National Centers for Environmental Information.
Accessed [date].
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Cited Authors |
- NOAA National Geophysical Data Center
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Publishers |
- NOAA National Centers for Environmental Information
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Theme keywords |
Global Change Master Directory (GCMD) 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 > Terrain Elevation > Topographical Relief
Maps
- Earth Science > Oceans > Coastal Processes > Coastal Elevation
Uncontrolled
- Coastal Relief
- Gridded elevations
- Integrated bathymetry and topography
Global Change Master Directory (GCMD) Service Keywords
- DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC
INFORMATION SYSTEMS
- DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
- DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
Global Change Master Directory (GCMD) Service Keywords
- DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC
INFORMATION SYSTEMS
- DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
- DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
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Data Center keywords |
Global Change Master Directory (GCMD) Data Center Keywords
- DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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Platform keywords |
Global Change Master Directory (GCMD) Platform Keywords
- Models/Analyses > DEM > Digital Elevation Model
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Place keywords |
Global Change Master Directory (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
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Project keywords |
Global Change Master Directory (GCMD) Project Keywords
- ICSU-WDS > International Council for Science - World Data System
- NOAA OneStop Project
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Data Resolution keywords |
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
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Use Constraints |
- Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability,
or completeness of furnished data. Users assume responsibility to determine the usability
of these data. The user is responsible for the results of any application of this
data for other than its intended purpose.
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Access Constraints |
- Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding
these data, nor does the fact of distribution constitute such a warranty. NOAA and
NCEI cannot assume liability for any damages caused by any errors or omissions in
these data. If appropriate, NCEI can only certify that the data it distributes are
an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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Other Constraints |
Cite as: NOAA National Geophysical Data Center. 2010: Southeast Alaska 8 arc-second
MHHW Coastal Digital Elevation Model. NOAA National Centers for Environmental Information.
Accessed [date]. |
Fees |
- In most cases, electronic downloads of the data are free. However, fees may apply
for custom orders, data certifications, copies of analog materials, and data distribution
on physical media.
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Lineage information for:dataset
Processor |
- NOAA National Centers for Environmental Information
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Processing Steps |
- 2010-08-01T00:00:00 -All datasets obtained by NGDC were converted to common horizontal and vertical datums
of WGS84 geographic and Mean Higher High Water, respectively, using FME, Proj4, and
GDAL. They were also converted to common file formats, ESRI point shapefiles or xyz,
for visualization and inspection.
- 2010-08-15T00:00:00 -Datasets were visually inspected with ArcGIS and QT Modeler for identification and
editing of data anomalies. Datasets were then compared with overlapping datasets to
ensure data consistency.
- 2010-09-01T00:00:00 -xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a
8 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 using GDAL to remove values over land.
- 2010-09-15T00:00:00 -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.
- 2010-09-30T00:00:00 -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.
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Processing Environment |
Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service
Pack 2; ESRI ArcCatalog 9.2.4.1420 |
Source Datasets |
- NOS Hydrographic Surveys
- NOS Hydrographic Survey Database (download)
Digital database of NOS hydrographic surveys that date back to the late 19th century.
- Description of Source: Source Contribution: hydrographic surveys downloaded from web site. ; Source Type:
online
- Temporal extent used:
1883-01-01 to 2009-01-01
- USACE Hydrographic Surveys
- USACE Alaska District Hydrographic Surveys (download)
Digital database of hydrographic surveys in Alaska
- Description of Source: Source Contribution: Hydrographic surveys downloaded from web site. ; Source Type:
online
- Temporal extent used:
1999-01-01 to 2008-01-01
- Electronic Navigational Charts
- OCS Electronic Navigational Charts (download)
Digital database of NOAA nautical chart information.
- Description of Source: Source Contribution: Extracted hydrographic soundings ; Source Type: online
- Temporal extent used:
1977-01-01 to 2009-01-01
- NGDC Multibeam Surveys
- NGDC Multibeam Survey Database (download)
Digital database of NGDC multibeam surveys.
- Description of Source: Source Contribution: multibeam surveys downloaded from web site. ; Source Type: online
- Temporal extent used:
1994-01-01 to 2009-01-01
- City of Juneau Harbor Surveys
- City of Juneau Harbor Surveys (download)
Digital surveys of the cruise ship and steam ship docks
- Description of Source: Source Contribution: Hydrographic surveys for Juneau Cruise and Steam Ship Docks ;
Source Type: digital files via email
- Time Instant:
2010-01-01
- Gridded 500-meter Bathymetry
- Canadian Hydrographic Service Gridded Bathymetry (download)
Gridded bathymetry in point shapefile format
- Description of Source: Source Contribution: Canadian Hydrographic Service hydrographic surveys ; Source Type:
digital files via FTP
- Time Instant:
2010-01-01
- NGDC Trackline Surveys
- NGDC Trackline Survey Database (download)
Digital database of NGDC Trackline surveys.
- Description of Source: Source Contribution: Trackline surveys downloaded from web site. ; Source Type: online
- Temporal extent used:
1959-01-01 to 1999-01-01
- Shuttle Radar Topography Mission (SRTM)
- Shuttle Radar Topography Mission (download)
global topography
- Description of Source: Source Contribution: gridded topographic data downloaded from web site. ; Source Type:
on web
- Time Instant:
2000-01-01
- Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)
- Bench Mark Data Sheets with Tidal Datum References
- Tides and Currents Station Selection
Bench Mark Data Sheets
- Description of Source: Source Contribution: tidal information table from which vertical datum adjustment
information are interpreted ; Source Type: online
- Temporal extent used:
1983-01-01 to 2001-01-01
- CHS Tidal Datum References
- Canadian Hydrographic Service Tidal Datums (download)
Tidal datum references for Canadian tide stations
- Description of Source: Source Contribution: Canadian Hydrographic Service tide station datums ; Source Type:
digital files via email
- Time Instant:
2010-01-01
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Lineage information for:repository
Processing Steps |
- 2015-04-22T00:00:00 -NOAA created the National Centers for Environmental Information (NCEI) by merging
NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC),
and National Oceanographic Data Center (NODC), including the National Coastal Data
Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations
Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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Acquisition Information (collection)
Instrument |
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Platform |
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Operation |
- NTHMP DEM Gridding Project
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Last Modified: 2022-03-25
For questions about the information on this page, please email:
ncei.info@noaa.gov