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Sitka, Alaska 3 arc-second DEM

The Sitka, Alaska Elevation Grid provides bathymetric data in ASCII raster format of 3 arc-second resolution in geographic coordinates. This grid is strictly for tsunami inundation modeling

Cite this dataset when used as a source.

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Distribution Formats
  • ESRI Arc ASCII (Version: 1)
    • File Compression: WINZIP
Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Publisher NOAA/PMEL/Center for Tsunami Research (NCTR)
oar.pmel.time-support@noaa.gov
Documentation links not available.
Publisher
  • NOAA/PMEL/Center for Tsunami Research (NCTR)
Date(s)
  • publication: 2005-07-19
Edition: 2005
Data Presentation Form: mapDigital
Dataset Progress Status Complete
Data Update Frequency: Irregular
Supplemental Information: This grid was developed through funding from the National Tsunami Hazard Mitigation Program. It will be updated as better data become available.
Purpose: This grid was constructed for use in tsunami inundation modeling
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 Geophysical Data Center. Not subject to copyright protection within the United States.
  • 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.
Time Period: Unknown  to  Unknown
Spatial Reference System: urn:ogc:def:crs:EPSG::4326 urn:ogc:def:datum:EPSG::5868
Spatial Bounding Box Coordinates:
N: 57.17
S: 56.90
E: -135.13
W: -135.60
Spatial Coverage Map:
Themes
  • DEM > Digital Elevation Model
  • 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
  • H: 1 meter - < 30 meters
  • V: < 1 meter
  • Coastal Relief
  • Gridded elevations
  • 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
Places
  • Continent > North America > United States of America > Southeast Alaska
  • Seldovia
  • Ocean > Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Alaska
  • Sitka Sound
  • Baranof Island
Use Constraints No constraint information available
Fees Fee information not available.
Source Datasets
  • MrSID Historical Charts
    • Description of Source: Source Contribution: bathymetric data values; Source Type: online
    • Temporal extent used:  unknown  to 
  • High-resolution vector shoreline, survey control points
    • Description of Source: Source Contribution: coastline and control data; Source Type: online
    • Temporal extent used:  unknown  to 
  • Tidal Benchmark Sheet for 9451600
  • GEODAS Vol 2, Ver 4.1
    • Description of Source: Source Contribution: bathymetric data values; Source Type: CD-ROM
    • Temporal extent used:  unknown  to 
  • Hypsographic and hydrographic vector data, DEMs
    • Description of Source: Source Contribution: topographic data values; Source Type: CD-ROM
    • Temporal extent used:  unknown  to 
  • Hydrographic Surveys for Sitka
    • Description of Source: Source Contribution: bathymetric data values; Source Type: ftp
    • Temporal extent used:  unknown  to 
  • Topographic DEM for Sitka
    • Description of Source: Source Contribution: topographic data values; Source Type: ftp
    • Temporal extent used:  unknown  to 
Lineage Statement Lineage statement not available.
Processor
  • NOAA/PMEL/Center for Tsunami Research (NCTR)
Processing Steps
  • Each raw data source was converted into ESRI ArcGIS formats. The resulting files were converted and adjusted to predetermined projection (geographic), horizontal datum (NAD27), and vertical datum (MHW). A polyline shapefile was created to represent the coastline. The coastline is a culmination of USGS hydrographic vectors, NOS high-resolution coastline, USACE data, and local knowledge of the area. A TIN (Triangulated Irregular Network) was created using bathymetric data point and coastline points. An 0.88-second grid was created from the tin. The data were assessed for quality and anomalies were removed. The grid was compared to its raw dataset. The 0.88-second grid was clipped to requested coordinates. A 0.88-arcsecond grid was created using USGS DEMs and UAF DEMs. The data were assessed for quality by comparing with raw datasets and control data. The topographic and bathymetric grids were merged into a single grid. The final grid was analyzed for blunders, systematic errors, and logical consistency.
  • Metadata imported.
Processing Environment Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.4.1420

Metadata Last Modified: 2014-10-29

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