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Yakutat, Alaska 1 arc-second DEM

The 1-second Yakutat Alaska Elevation Grid provides bathymetric data in ASCII raster format of 1-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 Distributor information not available
No point of contact available for this dataset
Documentation links not available.
    Publisher information not available.
  • publication: 2003-09-02
Edition: 2003
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
Time Period: 2003-07-01  to  2003-08-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 59.59
S: 59.43
E: -139.6
W: -139.93
Spatial Coverage Map:
  • DEM > Digital Elevation Model
  • H: 1 meter - < 30 meters
  • V: < 1 meter
  • Coastal Relief
  • Gridded elevations
  • Continent > North America > United States of America > Southeast Alaska
  • Yakutat
  • Ocean > Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Southeast Alaska
  • Alaska
  • Gulf of Alaska
  • Yakutat
Use Constraints No constraint information available
Fees Fee information not available.
Source Datasets
  • water level station data, tidal datums
    • Description of Source: tidal and geodetic datum conversions
  • global relief, hydrographic surveys, bathymetric maps
    • Description of Source: bathymetric elevation values and contours
    • Temporal extent used:  1938-01-01  to  1999-01-01
  • hypsographic and hydrographic vector data and dems
    • Description of Source: shoreline vector contours, elevations, control points
    • Temporal extent used:  1974-01-01  to  1986-01-01
Lineage Statement Lineage statement not available.
Processing Steps
  • Each raw data source was converted into ESRI Arc-compatible formats. The resulting files were converted and adjusted to predetermined projection (geographic), horizontal datum (NAD27), and vertical datum (MHW) using the ArcInfo PROJECT command and ArcView Spatial Analyst MAP CALCULATOR algorithm. An ArcView polyline shapefile was created to represent the coastline. The coastline is based on USGS hydrographic vectors. The USGS coastline was compared to high-resolution NGS vector shoreline; no discernible difference was found between the two datasets. Bathymetric contours and data points were digitized from raster charts and images. Each dataset was analyzed for quality. Anomalies were removed; approximately 30 points were removed from NOS hydrographic survey datasets. Overlapping contours and points were assessed for matching. Bathymetric data was prioritized by quality and date. Recent surveys superseded older data. A TIN (Triangulated Irregular Network) was created using bathymetric data and coastline vectors using ArcView 3D Spatial Analyst. A 0.88-arcsecond grid was created. The grid was contoured at 1-, and 5-meter contours to compare with the original datasets. Problematics areas were redone by adding additional contours in areas of low point density. The bathymetric grid was clipped to requested coordinates. USGS 30-meter DEMs were merged into a single grid and analyzed for quality. The dataset was compare to hydrographic and hypsographic contours, as well as USGS, NGS, and COOPs control points. Problematics areas (airport, grid overlaps) were redone by creating TINs using source data. The topographic grid was clipped to requested coordinates. The topographic and bathymetric grids were merged into a single 0.88-arcsecond grid. The 0.88-second grid was compared to the Yakutat AK 2.66-second grid to ensure continuity and quality. A gridmatching graphic (yak3_1.jpg) was produced to verify nest matching for modeling efforts. 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

Metadata Last Modified: 2015-09-03

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