Old Harbor, Alaska 8/15 arc-second Coastal Digital Elevation Model
NOAA's National Centers for Environmental Information (NCEI) 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 this dataset when used as a source.
gov.noaa.ngdc.mgg.dem:oldharbor_ak_815_mhhw
Other Access |
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Distribution Formats |
- NetCDF (Version: 1)
- File Specification: NetCDF
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Distributor |
DEM Information NOAA National Centers for Environmental Information dem.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 |
1929-01-01 to 2018-09-28 |
Spatial Reference System |
urn:ogc:def:crs:EPSG::4326MHHW |
Spatial Bounding Box Coordinates |
West: -153.34
East: -153.139999998
South: 57.16
North: 57.2699259273
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Spatial Coverage Map |
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Associated Resources |
- NTHMP DEM Project
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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 Akhiok, Karluk, and Old Harbor, 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 |
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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Originators |
- NOAA National Centers for Environmental Information
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
- National Tsunami Hazard Mitigation Program (NTHMP)
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Publishers |
- NOAA National Centers for Environmental Information
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Theme keywords |
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 Maps
- Earth Science > Oceans > Coastal Processes > Coastal Elevation
NASA/GCMD Platform Keywords- DEM > Digital Elevation Model
NASA/GCMD Data Resolution Keywords
- H: 1 meter - < 30 meters
- V: < 1 meter
Uncontrolled
- Coastal Relief
- Gridded elevations
- Integrated bathymetry and topography
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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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Place keywords |
NASA/GCMD Location Keywords
- Continent > North America > United States of America > Alaska
- Ocean > Pacific Ocean > North Pacific Ocean
- Vertical Location > Land Surface
- Vertical Location > Sea Floor
North Pacific
- Old Harbor
- Kodiak Island
- Sitkalidak Passage
- Sitkalidak Strait
- Sitkalidak Island
- Alaska
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Project keywords |
Global Change Master Directory (GCMD) Project Keywords- ICSU-WDS > International Council for Science - World Data System
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Use Constraints |
No constraint information available |
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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Fees |
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Lineage information for: dataset |
Processor |
- NOAA National Centers for Environmental Information
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Processing Steps |
- 2018-12-19T00:00:00 - All datasets obtained by NCEI were converted to common horizontal and vertical datums of WGS 84 geographic and Mean Higher High Water, respectively, based on tide station information. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
- 2018-12-29T00:00:00 - Datasets were visually inspected with ArcGIS and Global Mapper for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
- 2019-01-15T00:00:00 - 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 2 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting grid was clipped to the coastline to remove values over land.
- 2019-01-25T00:00:00 - 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.
- 2019-02-01T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.
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Processing Environment |
Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.0.8321 |
Source Datasets |
- Electronic Navigational Chart (ENC) digital soundings and depth contours charts US4AK5NM and US5AK08M
- NOS Hydrographic Surveys
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NOS Hydrographic Survey Database (download)
Digital database of NOS hydrographic surveys that date back to the late 19th century.
- Description of Source: NOS hydrographic survey data
- Temporal extent used: 1929-01-01 to 1933-01-01
- Bench Mark Data Sheet with Tidal Datum References
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Tides and Currents Station Selection
Bench Mark Data Sheet for station # 9457527
- Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
- Temporal extent used: 2009-08-22 to 2009-09-20
- ArcticDEM - Mosaic files Version 3.0
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ArcticDEM (download)
ArcticDEM is an NGA-NSF public-private initiative to automatically produce a high-resolution, high quality, digital surface model (DSM) of the Arctic using optical stereo imagery, high-performance computing, and open source photogrammetry software. Geospatial support for this work provided by the Polar Geospatial Center under NSF PLR awards 1043681 and 1559691. DEMs provided by the Polar Geospatial Center under NSF PLR awards 1043681, 1559691, and 1542736
- Description of Source: Optically Derived Digital Surface Model (DSM)
- Temporal extent used: 2013-02-15 to 2017-03-19
- UAF Akhiok, Karluk, and Old Harbor GPS
- Description of Source: GPS survey data obtained from UAF
- Harbor condition survey for Old Harbor
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Condition survey data of old Harbor (download)
Hydrographic Sounding at intervals and topographic data points along Project design lines spaced at specific intervals.
- Description of Source: Harbor condition survey
- Time Instant: 2014-04-01
- DCRA CAD topography
- Description of Source: Topographic point data from CAD data files
- Time Instant: 2006-05-21
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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) |
Platform |
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Last Modified: 2020-01-16
For questions about the information on this page, please email:
dem.info@noaa.gov