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Tetons.doc
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1993-04-20
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Tetons
The Tetons rise dramatically from the flat floor of Jackson Hole
without any intervening foothills. The highest peak, Grand Teton, is
almost 14,000 feet high. Strong glacial erosion has carved sharp peaks,
deep canyons, and two sizable lakes, Jenny Lake at the mouth of Cascade
Canyon northeast of the Grand Teton and Leigh Lake southeast of Mount
Moran. Jackson Lake, which fills much of the northern part of Jackson
Hole, has been enlarged by a dam across the Snake River. The western
slopes of the range are quite different in character, with tilted layers
of sedimentary rock gradually rising up toward alpine core. The range
is quite compact, making it possible to cover not only all of the most
scenic mountains, but also the western slopes and a good part of Jackson
Hole, in a group of 6 quadrangles.
The Grand Teton 7.5-minute quadrangle contains the highest and some
of the most rugged mountains in the range. The Grand Teton itself is at
the north edge of the quadrangle, with the Middle Teton and the South
Teton nearby to the south-southwest. The prominant canyon at the south
end of the quadrangle is Death Canyon, and Phelps Lake, at its mouth, is
dammed by a glacial moraine. Points in the DEM are spaced by 30 meters
both West to East and South to North in the Universal Transverse
Mercator coordinate system.
The Tetons.DEMset file will set up appropriate rendering parameters
for this area. Select it in the first file requester that appears when
you Save Data from GeoRama program. You can use this as a starting point
for your own rendering scheme.
Because Jackson Hole is very flat, it is a good to place springs at
the heads of the valleys and in the lakes you want to be visible, and then
in Panorama run rivers (after filling lakes) with the number of "lake"
rivers set to zero. Otherwise, many of the flat areas will be rendered as
lakes.