December 2011 Archives

Powerful Pixels: Mapping the Apollo Zone on the Moon

Mosaic of the near side of the moon as taken by the Clementine star trackers. The images were taken on March 15, 1994. Credit: NASA

Grayscale pixels - up close, they look like black, white or grey squares. But when you zoom out to see the bigger picture, they can create a digital photograph, like this one of our moon: For NASA researchers, pixels are much more - they are precious data that help us understand where we came from, where we've been, and where we're going.

At NASA's Ames Research Center, Moffett Field, Calif., computer scientists have made a giant leap forward to pull as much information from imperfect static images as possible. With their advancement in image processing algorithms, the legacy data from the Apollo Metric Camera onboard Apollo 15, 16 and 17 can be transformed into an informative and immersive 3D mosaic map of a large and scientifically interesting part of the moon.

The "Apollo Zone" Digital Image Mosaic (DIM) and Digital Terrain Model (DTM) maps cover about 18 percent of the lunar surface at a resolution of 98 feet (30 meters) per pixel. The maps are the result of three years of work by the Intelligent Robotics Group (IRG) at NASA Ames, and are available to view through the NASA Lunar Mapping and Modeling Portal (LMMP) and Google Moon feature in Google Earth.

"The main challenge of the Apollo Zone project was that we had very old data - scans, not captured in digital format," said Ara Nefian, a senior scientist with the IRG and Carnegie Mellon University-Silicon Valley. "They were taken with the technology we had over 40 years ago with imprecise camera positions, orientations and exposure time by today's standards."

The researchers overcame the challenge by developing new computer vision algorithms to automatically generate the 2D and 3D maps. Algorithms are sets of computer code that create a procedure for how to handle certain set processes. For example, part of the 2D imaging algorithms align many images taken from various positions with various exposure times into one seamless image mosaic. In the mosaic, areas in shadows, which show up as patches of dark or black pixels are automatically replaced by lighter gray pixels. These show more well-lit detail from other images of the same area to create a more detailed map.

Left: A normal one-camera image of the lunar surface. Right: A composite Apollo Zone image showing the best details from multiple photographs. Credit: NASA/Google Earth

"The key innovation that we made was to create a fully automatic image mosaicking and terrain modeling software system for orbital imagery," said Terry Fong, director of IRG. "We have since released this software in several open-source libraries including Ames Stereo Pipeline, Neo-Geography Toolkit and NASA Vision Workbench."

Lunar imagery of varying coverage and resolution has been released for general use for some time. In 2009, the IRG helped Google develop "Moon in Google Earth", an interactive, 3D atlas of the moon. With "Moon in Google Earth", users can explore a virtual moonscape, including imagery captured by the Apollo, Clementine and Lunar Orbiter missions.

The Apollo Zone project uses imagery recently scanned at NASA's Johnson Space Center in Houston, Texas, by a team from Arizona State University. The source images themselves are large - 20,000 pixels by 20,000 pixels, and the IRG aligned and processed more than 4,000 of them. To process the maps, they used Ames' Pleiades supercomputer.

The initial goal of the project was to build large-scale image mosaics and terrain maps to support future lunar exploration. However, the project's progress will have long-lasting technological impacts on many targets of future exploration.

The color on this map represents the terrain elevation in the Apollo Zone mapped area. Credit: NASA/Google Earth

"The algorithms are very complex, so they don't yet necessarily apply to things like real time robotics, but they are extremely precise and accurate," said Nefian. "It's a robust technological solution to deal with insufficient data, and qualities like this make it superb for future exploration, such as a reconnaissance or mapping mission to a Near Earth Object."

Near Earth Objects, or "NEOs" are comets and asteroids that have been attracted by the gravity of nearby planets into orbits in Earth's neighborhood. NEOs are often small and irregular, which makes their paths hard to predict. With these algorithms, even imperfect imagery of a NEO could be transformed into detailed 3D maps to help researchers better understand the shape of it, and how it might travel while in our neighborhood.

In the future, the team plans to expand the use of their algorithms to include imagery taken at angles, rather than just straight down at the surface. A technique called photoclinometry - or "shape from shading" - allows 3D terrain to be reconstructed from a single 2D image by comparing how surfaces sloping toward the sun appear brighter than areas that slope away from it. Also, the team will study imagery not just as pictures, but as physical models that give information about all the factors affect how the final image is depicted.

"As NASA continues to build technologies that will enable future robotic and human exploration, our researchers are looking for new and clever ways to get more out of the data we capture," said Victoria Friedensen, Joint Robotic Precursor Activities manager of the Human Exploration Operations Mission Directorate at NASA Headquarters. "This technology is going to have great benefit for us as we take the next steps."

This work was funded by NASA's LMMP, and supported by collaborators at NASA's Marshall Space Flight Center, Huntsville, Alabama, NASA's Goddard Space Flight Center, Greenbelt, Maryland, NASA's Jet Propulsion Laboratory, Pasadena, Calif. and the United States Geological Survey (USGS).

To view the maps, visit the LMMP site or view in Google Earth:

1. Download Google Earth at: http://earth.google.com

2. Click here to download a KML file for viewing in Google Earth: http://byss.ndc.nasa.gov/stereopipeline/dataviz/apollo_metric.kml

3. Once you open that file in Google Earth you will have options to view these "Apollo Zone" maps overlaid on Google Earth's "Moon mode".

Jessica Culler, 650-604-4789
Ames Research Center, Moffett Field, Calif.

Restoring Instant Analog Photographic Technology

The five Lunar Orbiter missions took photographs of the Moon and processed them - on film - in lunar orbit - via a chemical process developed by Eastman Kodak - one that is somewhat similar to Polaroid's instant film products. The developed images were scanned and sent back to Earth and stored as analog data. After the missions were completed the tapes and rives were stored and then forgotten. A generation later, in 2008, the Lunar Orbiter Image Recovery Project (LOIRP) re-engineered the original tape drives and re-processed the original mission analog data tapes - using 21st Century processing capabilities to produce dramatically enhanced versions of these iconic and historic images. We wholeheartedly believe that there are new things than can be learned from old stuff. As such, when we learned of this effort to save - and continue - the Polaroid analog image process (Kodak's competitor), well, we had to support it.

According to Wikipedia:

"Polaroid Corporation is an American-based international consumer electronics and eyewear company, originally founded in 1937 by Edwin H. Land. It is most famous for its instant film cameras, which reached the market in 1948, and continued to be the company's flagship product line until the February 2008 decision to cease all production in favor of digital photography products.[1] The company's original dominant market was in polarized sunglasses, an outgrowth of Land's self-guided research in polarization after leaving Harvard University after his freshman year—he later returned to Harvard to continue his research."

According to the project's website:

"We're always dreaming about making the impossible possible and lately we can't stop thinking about a new Impossible camera. We envision a high quality camera that is optimized to make the best out of our new, constantly improving film materials.

Therefore we have now started the Impossible Camera Project. Together with a small team of real analog camera experts, amongst others long time Polaroid camera expert Henny Waanders, we are currently evaluating and researching all possible and impossible possibilities regarding the production of a new analog instant camera.

Our idol is the legendary Polaroid SX 70 camera. Discontinued more than 30 years ago, this Polaroid cam is one of the most wanted instant cameras worldwide. The reasons are obvious: the high quality lens combined with the revolutionary folding design and the premium materials are simply irresistible. In 1972 this camera was simply the revolution and it changed the world of photography taking hearts in storm. Since today the SX-70 has not lost anything of its magic and it is still our hero as well as inspiration in all undertaking towards an Impossible camera.

Stay tuned to learn more as soon as things evolve."

According to ITT (which bought Kodak):

"Photos were processed automatically by the Orbiter's photographic system as the spacecraft orbited the Moon's dark side. This operation was performed by a KODAK BITMAT diffusion transfer process using 'dry' chemistry. A high-intensity light beam then optically scanned the photographic prints, and the images were transmitted to receiving stations on Earth."

Additional information

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RECOMMENDED BOOKS

Moonrush: Improving Life on Earth with the Moon's Resources
Moonrush: Improving Life on Earth with the Moon's Resources

The Kaguya Lunar Atlas: The Moon in High Resolution
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Lunar Orbiter Photographic Atlas of the Near Side of the Moon
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The Far Side of the Moon: A Photographic Guide
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The Clementine Atlas of the Moon
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The International Atlas of Lunar Exploration
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Voices from the Moon: Apollo Astronauts Describe Their Lunar Experiences
Voices from the Moon: Apollo Astronauts Describe Their Lunar Experiences

Apollo: Through the Eyes of the Astronauts
Apollo: Through the Eyes of the Astronauts

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