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Belgian Amiga Club - ADF Collection
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BS1 part 27
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Panorama3_d3.adf
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GlacierBay.doc
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1993-04-20
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Glacier Bay/Mount Fairweather
The Glacier Bay area in Alaska is famous for its rugged mountains
and tidewater glaciers. Just two hundred years ago the entire bay
was filled with ice, but the glaciers retreated dramatically in the
late 19th and early 20th centuries. Now the remaining glaciers are
at the heads of fiords some 50 or 60 miles long. Between Glacier Bay
and the Gulf of Alaska is what is now a long peninsula with a chain
of towering mountains rising abruptly from the sea. The highest is
Mount Fairweather at over 15,000 feet, and Mount Crillon is over
12,000 feet. The center of the peninsula is occupied by the Brady
Glacier, an enormous icefield feeding streams of ice in several different
directions.
A sampling of this spectacular scenery is contained in the DEM files
FairwthW02.dem and FairwthW12.dem, subquadrangles of the Mount Fairweather
West one degree DEM. The highest point of Mount Fairweather itself is just
west of the boundary between the two subquadrangles. The fiord coming into
the FairwthW12 subquadrangle from the east is an arm of Glacier Bay called
John Hopkins Inlet, and the western and southern part of the FairwthW02
subquadrangle extends into the Gulf of Alaska.
Each one degree by one degree quadrangle is split up, at this
lattitude, into six subquadrangles. The two digits at the end of the
subquadrangle file name locate the subquadrangle within the one degree
quadrangle. The first digit varies from 0 at the west edge of the
quadrangle to 1 at the east edge of the quadrangle. The second digit
varies from 0 at the south edge of the quadrangle to 2 at the north
edge of the quadrangle. The points in the DEMs are spaced every 3
seconds of arc in lattitude from south to north (about 90 meters) and
every 6 seconds of arc in longitude from west to east, which at this
latitude of about 60 degrees is also about 90 meters.
The Fairwth.DEMset file sets up the rendering parameters for
this area in a way which does a reasonably good job of properly coloring
the glaciers which fill the valleys almost down to sea level. This is
done by taking advantage of the flatness of the lower reaches of the
glaciers with the SlopeBlend parameter. Load this file using the
first file requester that appears when you "Save Data" from GeoRama.
Since much of the terrain is covered by ice and snow, you probably will
not want to fill lakes or run rivers in Panorama.