60 Meter Hillshade of the NED Clipped to Alaska
GIS Team National Park Service, Alaska Regional Office. 2003. 60 Meter Hillshade of the NED Clipped to Alaska. National Park Service, Alaska Regional office
This is a hillshade of the National Elevation Dataset (NED) for Alaska clipped to the same coast as the ak90 DEM previously produced by the NPS. The tiles were mosaicked in strips to stay under the 2GB limit on ESRI Grids. Then each strip was converted to Z values of feet from meters, projected to Alaska Albers, and converted to an integer grid. The strips were mosaiced and clipped using the Alaska coast as a mask. N.B. The NED is currently missing the east, south, and west portions of St. Lawrence Island. This dataset incorporates the 300 meter DEM for these areas. In addition, there is no data in the NED for any portion of Alaska in the Eastern hemisphere( Aleutian Is.). The following is a description of the NED from the USGS Website: The National Elevation Dataset (NED) is a seamless raster product derived primarily from USGS 30-meter Digital Elevation Models (DEMs), along with higher resolution data where available. NED data for Alaska is expressed in geographic coordinates (latitude/longitude). It is horizontally referenced to the North American Datum of 1927 (NAD27) and vertically referenced to the North American Vertical Datum of 1929 (NAVD29). The resolution is two arc-seconds (approximately 60 meters). URL for NED Fact Sheet 148-99 (September 1999) http://mac.usgs.gov/mac/isb/pubs/factsheets/fs14899.html
- Type
- Geospatial Dataset
- Authors
- GIS Team National Park Service, Alaska Regional Office
- Date of Issue
- 2003-02-04
- Publisher
- National Park Service, Alaska Regional office
- Units
- AKRO , ANIA , BELA , CAKR , DENA , GAAR , GLBA , KATM , KEFJ , KLGO , KOVA , LACL , NOAT , SITK , WRST , YUCH
- Keywords
- AKRO, Alaska, Alaska Region NPS Regional Office, Elevation, Hillshade, National Elevation Dataset, NED, Shaded relief