NASA Dives Into Its Past to Retrieve Vintage Satellite Data, Science (subscription)

"Last month, researchers working out of an abandoned McDonald's restaurant on the grounds of NASA Ames Research Center recovered data collected by NASA's Nimbus II satellite on 23 September 1966. The satellite soared over Earth in a polar orbit every 108 minutes, taking pictures of cloud cover and measuring heat radiated from the planet's surface, and creating a photo mosaic of the globe 43 years ago. The resulting image is the oldest and most detailed from NASA's Earth-observing satellites. It's also the latest success story in what researchers call techno-archaeology: pulling data from archaic storage systems. Once forgotten and largely unreadable with modern equipment, old data tapes are providing researchers with new information on changes in the surfaces of Earth and the moon..."

... The LOIRP team obtained $750,000 from NASA and private enterprise and enlisted the assistance of a retired Ampex engineer. They cleaned, rebuilt, and reassembled one drive, then designed and built equipment to convert the analog signals into an exact 16-bit digital copy. "It was like dumpster diving for science," says Cowing, co-team leader at LOIRP. In November 2008, the team recovered their first image: a famous picture of an earthrise taken by Lunar Orbiter 1 on 23 August 1966. The team's new high-resolution version was so crisp and clear that it revealed many previously obscured details, such as a fog bank lying along the coast of Chile. "We thought if the Earth's surface looks that good a quarter of a million miles away, what does the moon's surface look like 100 miles beneath it?" says Cowing."

Click on image to enlarge

On 23 August 1966, the Lunar Orbiter 1 spacecraft took a photo of the Earth as seen from lunar orbit. This image, albeit grainy, quickly became an icon of the Space Age. This "earthrise" photo, while spectacular at the time, was never retrieved and processed to the full level of detail contained in the image. This was due in great part of the available technology at the time. Computer image processing was in its infancy.

Forty two years later, the Lunar Orbiter Image Recovery Project (LOIRP) managed to retrieve the image from original data tapes using restored tape drives from the 1960s. In so doing the level of detail present in the image was unparalleled. Subsequently, other images have been retrieved with the ultimate goal of obtaining all of the images returned by the five Lunar Orbiters.

One of the striking aspects of this newly enhanced image is the amount of detail that can be seen on Earth at a resolution of perhaps 1 km/pixel taken from a quarter of a million miles away. Among the details visible is the extent of the southern polar ice cap.

The LOIRP required a lot of what has come to be called "techoarchaeology" that is, going back in time to the original data and recording devices, using modern enhancements. The expertise gained by the LOIRP team eventually caught the attention of the folks at the National Snow and Ice Data Center (NSIDC).

Data from the Nimbus weather and earth observation satellite - in orbit at the same time as the Lunar Orbiters were circling the Moon - had languished for years in the national archives until John Moses NASA Goddard Space Flight Center had them digitized.  

Dr. Walt Meir of the National Snow and Ice Data Center, after seeing the work that the LOIRP team had done in potentially identifying the Antarctic sea ice in the Lunar Orbiter 1 Earthrise image, and recognizing the similarity between the raw data of the Nimbus and Lunar Orbiter data, provided a grant to the LOIRP team to process the Nimbus data into a modern format and to correct image artifacts that are common to both types of images.  

The LOIRP team accomplished this, and rendered the images into the Google Earth format using a variety of internally developed techniques and elements of the NASA Ames developed NASA World Wind Java software development kit.

To date some of the images taken by Nimbus II have been enhanced and mapped into Google Earth. One date in particular was of interest to the LOIRP - 23 August 1966. As the images were enhanced and dropped into Google Earth it became clear that we have imagery that overlapped in time to show the weather on that late August day as evening crept up on Africa and Europe.

In New York City, just over the Earth's limb as seen from lunar orbit, the Beatles were preparing to play at Shea Stadium ...

You can download a KMZ file of these images here for viewing in Google Earth.

Related Links

- Techno-Archaeology Rescues Climate Data from Early Satellites
- LOIRP Aids In Finding Google Earth Images from 1966
- Newly Restored Lunar Orbiter Image of Earth and Moon (Detail)

The original Lunar Orbiter 1 image of Earth on 23 August 1966 (click on image to enlarge)

Nimbus II imagery of Earth on 23 August 1966 (click on image to enlarge)

Overlap of Nimbus II imagery onto Lunar Orbiter 1 imagery (click on image to enlarge)

Techno-Archaeology Rescues Climate Data from Early Satellites, National Snow and Ice Data Center

Image: Forty-three years after the Nimbus II satellite collected these data, a team from NSIDC and NASA recovered a global image from September 23, 1966. In this view over Antarctica, overlaid on Google Earth, the Ross Ice Shelf appears clearly at left.

"Starting with the methods developed for the Lunar Orbiter Image Recovery Project (LOIRP) at NASA Ames Research Park, a team at NSIDC worked with Dennis Wingo at LOIRP to search NASA archives for the original Nimbus tapes containing raw images and calibrations. Their first goal was to read and reprocess the data at a higher resolution, removing errors resulting from the limits of the original processing."

Technoarcheology and Earth Sciences, the Recovery of Nimbus II High Resolution Infrared Radiometer Data

"In 2008 the Lunar Orbiter Image Recovery Project (LOIRP) began a NASA ESMD sponsored project to resurrect 43+ year old Ampex FR-900 instrumentation tape drives for the purpose of recovering, before the capability to do so becomes impossible, the last surviving master tapes from the five Lunar Orbiter spaceraft that orbited the Moon in support of Apollo in 1966-67. Our project is proceeding on our task to do so. During our research on the Ampex tape drives we scoured the NASA Technical Reports Server as well as any other source we could get our hands on. During this search, we found, through a Cadillac (yes the car) user group, a gentleman from Alaska who had worked on these drives during the 1960's. We were able to connect and while he had retired and the units were long gone to that great scrap yard in the sky, he told me something interesting. He said that during his time working on the drives that they had sent "miles and miles, thousands of tapes" to NASA during the Nimbus weather satellite program. This is where our new tale begins."

"One of the things that the LOIRP team is going to do is to take the Nimbus II HRIR data from August 23rd 1966 and overlay that with the Lunar Orbiter 1 data on the same date for a composite mosaic. There is potential for a significant synergy between Lunar Orbiter, Apollo, and Nimbus II and III data sets. This type of synergy could provide many benefits to the Earth sciences community."