The Visible Earth
http://visibleearth.nasa.gov/
http://visibleearth.nasa.gov/Sensors/Terra/MODIS.html
This Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)
image of Mt. St. Helens volcano in Washington State was acquired on August
8, 2000 and covers an area of 37 by 51 km. Mount Saint Helens, a volcano
in the Cascade Range of southwestern Washington that had been dormant since
1857, began to show signs of renewed activity in early 1980. On 18 May 1980,
it erupted with such violence that the top of the mountain was blown off,
spewing a cloud of ash and gases that rose to an altitude of 19 kilometers.
The blast killed about 60 people and destroyed all life in an area of some
180 square kilometers (some 70 square miles), while a much larger area was
covered with ash and debris. It continues to spit forth ash and steam intermittently.
As a result of the eruption, the mountain's elevation decreased from 2,950
meters to 2,549 meters.
The simulated fly-over was produced by draping ASTER visible and near infrared
image data over a digital topography model, created from ASTER’s 3-D stereo
bands. The color was computer enhanced to create a “natural” color image,
where the vegetation appears green. The topography has been exaggerated 2
times to enhance the appearance of the relief.
Space Imaging.
http://www.spaceimaging.com/gallery/default.htm
http://www.space.com/news/olympics_flyover_020208.html
Atmospheric Phenomenon
http://rsd.gsfc.nasa.gov/rsd/bluemarble/
The Imaging Radar Home Page is based out of NASA's Jet Propulsion Laboratory
in Pasadena, California. The URL for this Web site is http://southport.jpl.nasa.gov/.
There are three objectives for this Web site:
1. Inform the public about the work NASA and JPL (and other
institutions) are conducting in radar remote sensing of the Earth's surface.
2. Describe to any and all interested users how they may
obtain, use, and analyze radar data and images.
3. Educational outreach.
Lost city of Ubar
This is a radar image of the region around the site of the lost city of Ubar
in southern Oman, on the Arabian Peninsula. The ancient city was discovered
in 1992 with the aid of remote sensing data. Archeologists believe Ubar existed
from about 2800 B.C. to about 300 A.D. and was a remote desert outpost where
caravans were assembled for the transport of frankincense across the desert.
This image was acquired on orbit 65 of space shuttle Endeavour on April 13,
1994 by the Spaceborne Imaging Radar C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR).
The SIR-C image shown is centered at 18.4 degrees north latitude and 53.6
degrees east longitude. The image covers an area about 50 by 100 kilometers
(31 miles by 62 miles). The image is constructed from three of the available
SIR-C channels and displays L- band, HH (horizontal transmit and receive)
data as red, C- band HH as blue, and L-band HV (horizontal transmit, vertical
receive) as green. The prominent magenta colored area is a region of large
sand dunes, which are bright reflectors at both L- and C-band. The prominent
green areas (L-HV) are rough limestone rocks, which form a rocky desert floor.
A major wadi, or dry stream bed, runs across the middle of the image and
is shown largely in white due to strong radar scattering in all channels
displayed (L and C HH, L-HV). The actual site of the fortress of the lost
city of Ubar, currently under excavation, is near the Wadi close to the center
of the image. The fortress is too small to be detected in this image. However,
tracks leading to the site, and surrounding tracks, appear as prominent,
but diffuse, reddish streaks. These tracks have been used in modern times,
but field investigations show many of these tracks were in use in ancient
times as well. Mapping of these tracks on regional remote sensing images
was a key to recognizing the site as Ubar in 1992. This image, and ongoing
field investigations, will help shed light on a little known early civilization.
http://southport.jpl.nasa.gov/.
The NASA Space Shuttle Earth Observations Photography database of over 400,000
images is a national treasure.
http://earth.jsc.nasa.gov/
Moons of the solar system Total count 129
http://www.solarviews.com/cap/index/moon1.html
This page is an annotated bibliography of scientific visualization web sites
around the world. It is a service of the NAS (Numerical Aerospace Simulation)
Facility at NASA Ames Research Center.
http://www.nas.nasa.gov/Groups/VisTech/visWeblets.html
NASA Human Spaceflight
http://spaceflight.nasa.gov/
This chronology gives a list of a known (successful and unsuccessful) lunar
and planetary missions including a few historical missions which were instrumental
in the development and evolution of space exploration. The timeline can be
viewed in its entirety (about 45 K in size):
http://nssdc.gsfc.nasa.gov/planetary/chrono.html
Solar System Simulator
http://space.jpl.nasa.gov/
An Apollo Gallery
http://www.halien.com/TAS/Gallery/apollo/
Geology of the Moon
http://faculty.erau.edu/ericksol/courses/sp110/lunar_geo.html