Hickman, P.J., Suleimani, E.N., and Nicolsky, D.J., 2012, Digital elevation model of Sitka Harbor and the city of Sitka, Alaska: Procedures, data sources, and quality assessment: Miscellaneous Publication MP 144, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
This is a raster data set.
The horizontal datum used is World Geodetic System of 1984.
The ellipsoid used is World Geodetic System 1984.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257223563.
This grid was developed through funding from the National Tsunami Hazard Mitigation Program.
(907)451-5029 (voice)
dggsgis@alaska.gov
This grid was constructed for use in tsunami inundation modeling.
NOAA National Ocean Service, Office of Coast Survey, 2003, NOS multibeam hydrographic survey H11117: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20060824, NOS multibeam hydrographic survey H11118: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20061024, NOS multibeam hydrographic survey H11119: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20061005, NOS multibeam hydrographic survey H11120: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20070103, NOS multibeam hydrographic survey H11121: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20090416, NOS multibeam hydrographic survey H11122: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20070906, NOS BAG multibeam hydrographic survey H11123: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20080331, NOS BAG multibeam hydrographic survey H11124: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20060503, NOS BAG multibeam hydrographic survey H11130: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20090429, NOS BAG multibeam hydrographic survey H11271: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Office of Coast Survey, 20070212, NOS multibeam hydrographic survey H11354: NOAA National Ocean Service, Office of Coast Survey, Silver Spring, Maryland, USA.Online Links:
U.S. Army Corps of Engineers Alaska District, 2001, Western Channel Hydrographic Survey for Sitka: USACE Alaska District, Anchorage, Alaska, USA.Online Links:
U.S. Army Corps of Engineers Alaska District, 2005, Crescent Harbor Hydrographic Survey for Sitka: USACE Alaska District, Anchorage, Alaska, USA.Online Links:
U.S. Army Corps of Engineers Alaska District, 2005, Channel Rock Breakwaters Hydrographic Survey for Sitka: USACE Alaska District, Anchorage, Alaska, USA.Online Links:
U.S. Army Corps of Engineers Alaska District, 2008, Sitka Channel Rock Breakwaters Hydrographic Survey: USACE Alaska District, Anchorage, Alaska, USA.Online Links:
NOAA National Ocean Service, National Geodetic Survey, 2006, High-resolution vector shoreline, survey control points: NOAA National Ocean Service, National Geodetic Survey, Silver Spring, Maryland, USA.Online Links:
NOAA National Ocean Service, Center for Operational Oceanographic P, 20030421, Tidal Benchmark Sheet for 9451600: NOAA National Ocean Service, CO-OPS, Silver Spring, Maryland, USA.Online Links:
Geographic Information Network of Alaska - University of Alaska Fairbanks, 2010, Shuttle Radar Topography Mission v2 Web Coverage Service: GINA, Fairbanks, Alaska, USA.Online Links:
Geographic Information Network of Alaska - University of Alaska Fairbanks, 2010, ASTER GDEM (Alaska) Web Coverage Service: GINA, Fairbanks, Alaska, USA.Online Links:
Geophysical Institute, University of Alaska Fairbanks, Unpublished material, Topographic DEM for Sitka: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, USA.Online Links:
Person who carried out this activity:
907-474-7558 (voice)
info@gi.alaska.edu
The accuracy of this elevation grid is dependent on the accuracy of its source data. These sources include NASA SRTM and ASTER DEMs; UAF topographic DEMs, NOS hydrographic surveys and shoreline vectors; and USACE survey data. The primary limiting factors include the scale, age, and resolution of the surveys. A significant amount of quality control was performed on the grid, using initial data points and other sources for comparison.
The horizontal accuracy of the grid is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based on horizontal accuracy tests of the source data which are selected as equal to or less than the intended horizontal RMSE error of the grid. Horizontal positioning of the various source points were compared with each other to verify grid accuracy.
Bathymetry - The maximum, minimum and mean of the difference between the depth value of all source hydrographic survey data-points and the corresponding DEM value is used to assess the bathymetric vertical accuracy of the grid.It accounts for surface interpolation errors. The accuracy of hydrographic survey data-points are within 2% of depth (+/- 25.0 meters, mean = -0.02 meter). Topography - The maximum, minimum and mean difference between the elevation value for each of 12,172 Alaska Dept. of Transportation and Public Facilities survey control monuments and the corresponding DEM value is used to assess the topographic vertical accuracy of the grid (+/- 10.0 meters, mean = 0.14 meter).
Errant data points were removed from the various sources before processing the grid. The final grid was visually and statistically inspected for completeness using ArcGIS.
Each dataset has undergone a stringent quality control procedure from their respective originators. The developed grid was compared with initial sources, other source control data, and corresponding data between datasets to verify accuracy. All values both topographic and bathymetric had to be converted to a common vertical datum. The original topo data was referenced in Geoid EGM96 which is equivalent to Mean Sea Level (MSL), but had to be converted to the Mean Higher High Water (MHHW) tidal datum to provide a smooth transition at the coastline.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Use_Constraints:
- Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
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MP 144
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.
DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.
| Data format: | Raster Dataset |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/23964> |
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