Digital archive casts new light on Apollo-era moon pictures (Forwarded)

Arizona State University
College of Liberal Arts and Sciences
School of Earth and Space Exploration
Tempe, Arizona

Contact:
Robert Burnham, 480-458-8207

August 1, 2007

Digital archive casts new light on Apollo-era moon pictures

Arizona State University partners with NASA to digitize original photos

TEMPE, Ariz. -- Nearly 40 years after man first walked on the moon, the
complete lunar photographic record from the Apollo project will be
accessible to both researchers and the general public on the Internet. A new
digital archive -- created through a collaboration between Arizona State
University and NASA's Johnson Space Center in Houston -- is making available
high-resolution scans of original Apollo flight films. They are available to
browse or download at:
http://apollo.sese.asu.edu

The digital scans are detailed enough to reveal photographic grain. Created
from original flight films transported back to Earth from the moon, the
archive includes photos taken from lunar orbit as well as from the lunar
surface. This is the first project to make digital scans of all the original
lunar photographs from NASA's Apollo missions.

"This project fulfills a long-held wish of mine. It'll give everyone a
chance to see this unique collection of images as clearly as when they were
taken," says Mark Robinson, professor of geological sciences in ASU's School
of Earth and Space Exploration, part of the College of Liberal Arts and
Sciences.

Robinson leads the ASU side of the Apollo image digitizing project.
Separately, he is the principal investigator for the Lunar Reconnaissance
Orbiter Camera, or LROC (lroc.sese.asu.edu) -- a suite of three separate,
high-resolution imagers on board NASA's Lunar Reconnaissance Orbiter, due
for launch in October 2008.

The reason the original Apollo images have been so seldom accessed is that
they are literally irreplaceable. Between 1968 and 1972, NASA made sets of
duplicate images after each moon mission came back to Earth, placing the
duplicate sets in various scientific libraries and research facilities
around the world.

As a result, these second-generation copies (and subsequent copies of
copies) are what scientists and the public have seen. The copied images are
unsharp and over-contrasty compared to the originals, which have remained in
deep-freeze storage at the Johnson Space Center. Even many lunar scientists
have not seen or worked with them.

The Apollo digitizing project goes back to the original flight films and
scans them in high-resolution detail to reveal their subtleties.

Robinson explains, "We worked with the scanner's manufacturer -- Leica
Geosystems -- to improve the brightness range that the scans record." In
technical terms, a normal 12-bit scan was increased to 14-bit, resulting in
digital images that record more than 16,000 shades of gray.

"Similarly," says Robinson, "to get all the details captured by the film, we
are scanning at a scale of 200 pixels per millimeter." This means, he says,
the grain of the original film is visible when scans are fully enlarged. The
most detailed images from lunar orbit show rocks and other surface features
about 40 inches (1 meter) wide.

Combining high resolution and wide brightness range produces very large raw
image files, notes Robinson. For example, in raw form, the scans of the
Apollo mapping (metric) camera frames, each 4.7 inches square, are 1.3
gigabytes in size.

"That's bigger than most people want to look at with a browser," says
Robinson, "even if their browser and Internet connection are up to the job."
So the Web site uses a Flash-based application called Zoomify, which lets
users dive deep into a giant image by loading only the portion being
examined. Links are available on the site for downloading images in several
sizes, up to the full raw scan.

The project will take about three years to complete and will scan some
36,000 images. These include about 600 frames in 35 mm, roughly 20,000
Hasselblad 60 mm frames (color, and black and white), more than 10,000
mapping camera frames, and about 4,600 panoramic camera frames.

"These photos have great scientific value, despite being taken decades ago,"
says Robinson.

He adds, "I think they also give everybody a beautiful look at this small,
ancient world next door to us."