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NASA/JPL/NIMA.
"OceaniaSRTM-OahuHawaii-picasa.jpg"
Online Image. Shuttle Radar Topography Mission. 20 Jan. 2006 82kb. 643x548px.
<http://photojournal.jpl.nasa.gov/catalog/PIA02727>
Hawaii - Oahu
This image shows a perspective view created by draping a Landsat image over the elevation framework
from an SRTM data set for the island of Oahu.
It was created from an original map produced from data obtained by NASA's
Shuttle Radar Topography Mission (SRTM). Using Google's free Picasa2 program, the
contrast was enhanced, and fill light was added to brighten the image. It was then sharpened, and the
saturation and highlights were increased slightly to accentuate the colors of the image above. The
original image can be viewed at the NASA link above.
Honolulu, on the island of Oahu, is a large and growing urban area with limited space and water resources.
This perspective view, combining a Landsat image with SRTM topography, shows how the topography controls
the urban growth pattern, causes cloud formation, and directs the rainfall runoff pattern. Features of
interest in this scene include downtown Honolulu (right), Honolulu Harbor (right), Pearl Harbor (center),
and offshore reef patterns (foreground). The Koolau mountain range runs through the center of the image.
On the north shore of the island are the Mokapu Peninsula and Kaneohe Bay (upper right).
Clouds commonly
hang above ridges and peaks of the Hawaiian Islands, and in this rendition appear draped directly on the
mountains. The clouds are actually about 1000 meters (3300 feet) above sea level. High resolution topographic
and image data allow ecologists and planners to assess the effects of urban development on the sensitive
ecosystems in tropical regions. This type of display adds the important dimension of elevation to the
study of land use and environmental processes as observed in satellite images. The perspective view was
created by draping a Landsat 7 satellite image over an SRTM elevation model. Topography is exaggerated
about six times vertically. The Landsat 7 image was acquired on February 12, 2000, and was provided by
the United States Geological Survey's Earth Resources Observations Systems (EROS) Data Center,
Sioux Falls, South Dakota.
Size: 28 by 56 kilometers (17 by 35 miles)
Location: 21.4 deg. North lat., 157.8 deg. West lon.
Orientation: Looking North
Original Data Resolution: SRTM, 30 meters (99 feet); Landsat, 15 meters (50 feet)
Date Acquired: SRTM, February 18, 2000; Landsat February 12, 2000
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