The science team that oversees the imaging system on board NASA’s Lunar Reconnaissance Orbiter (LRO) has released the highest resolution near-global topographic map of the moon ever created.
This new topographic map, from Arizona State University in Tempe, shows the surface shape and features over nearly the entire moon with a pixel scale close to 100 meters (328 feet). A single measure of elevation (one pixel) is about the size of two football fields placed side-by-side.
Although the moon is our closest neighbor, knowledge of its morphology is still limited. Due to instrumental limitations of previous missions, a global map of the moon’s topography at high resolution has not existed until now. With the LRO Wide Angle Camera and the Lunar Orbiter Laser Altimeter (LOLA) instrument, scientists can now accurately portray the shape of the entire moon at high resolution.
“Our new topographic view of the moon provides the dataset that lunar scientists have waited for since the Apollo era,” says Mark Robinson, Principal Investigator of the Lunar Reconnaissance Orbiter Camera (LROC) from Arizona State University in Tempe. “We can now determine slopes of all major geologic terrains on the moon at 100 meter scale. Determine how the crust has deformed, better understand impact crater mechanics, investigate the nature of volcanic features, and better plan future robotic and human missions to the moon.”
Called the Global Lunar DTM 100 m topographic model (GLD100), this map was created based on data acquired by LRO’s WAC, which is part of the LROC imaging system. The LROC imaging system consists of two Narrow Angle Cameras (NACs) to provide high-resolution images, and the WAC to provide 100-meter resolution images in seven color bands over a 57-kilometer (35-mile) swath.
The WAC is a relatively small instrument, easily fitting into the palm of one’s hand; however, despite its diminutive size it maps nearly the entire moon every month. Each month the moon’s lighting has changed so the WAC is continuously building up a record of how different rocks reflect light under different conditions, and adding to the LROC library of stereo observations.
The LROC (WAC) has a pixel scale of about 75 meters (246 feet), and at the average altitude of 50 km (31 miles) a WAC image swath is 70 km (43 miles) wide across the ground-track. Since the equatorial distance between orbits is about 30 km (18 miles) there is complete overlap all the way around the moon in one month. The orbit-to-orbit WAC overlap provides a strong stereo effect. Using digital photogrammetric techniques, a terrain model can be computed from the stereo overlap.
The near-global topographic map was constructed from 69,000 WAC stereo models and covers the latitude range 79°S to 79°N, 98.2% of the entire lunar surface. Due to persistent shadows near the poles it is not possible to create a complete stereo based map at the highest latitudes. However, another instrument onboard LRO called LOLA excels at mapping topography at the poles. Since LOLA ranges to the surface with its own lasers, and the LRO orbits converge at the poles, a very high resolution topographic model is possible, and can be used to fill in the WAC “hole at the pole.” The WAC topography was produced by LROC team members at the German Aerospace Center.
“Collecting the data and creating the new topographic map was a huge collaborative effort between the LRO project, the LOLA team, the LROC team at ASU and in Germany at the DLR,” says Robinson. “I could not be more pleased with the quality of the map – it’s phenomenal! The richness of detail should inspire lunar geologists around the world for years to come.”
Shaded relief images can be created from the GLD100 by illuminating the “surface” (in this case the shape model) from a given Sun direction and elevation above the horizon. To convey an absolute sense of height the resulting grayscale pixels are painted with colors that represent the altitude. Visualizations like these allow scientists to view the surface from very different perspectives, providing a powerful tool for interpreting the geologic processes that have shaped the moon.
The LRO spacecraft is managed by NASA’s Goddard Space Flight Center in Greenbelt, Md., for NASA’s Science Mission Directorate in Washington.
The current model incorporates the first year of stereo imaging; there is another year of data that can be added to the solution. These additional stereo images will not only improve the sharpness (resolution) of the model but also fill in very small gaps that exist in the current map. Also the LROC team has made small improvements to the camera distortion model and the LOLA team has improved our knowledge of the spacecraft position over time. These next generation steps will further improve the accuracy of the next version of the LROC GLD100 topographic model of the moon.
› Related story and imagery from Arizona State University
Case Number:28697 Log Number:US-04152011-0018 Submitted Date:2011-04-15 23:11 GMT Event Date:2011-04-14 01:45 GMT Status:Submitted City:Sterling Region:Virginia Country:US Longitude:-77.408297 Latitude:39.001333 Shape:Star-like Distance:One mile or less Location:Suburban Terrain:Woods Visibility:Overcast Weather:None Vallee Index:MA1 Description:
My phone rings and it is my 20 year old son who was about 2 miles from home at a friends home. He next asks me if I heard that plane? I quickly moved outside and continued the conversation and told him there were no jet sounds at my location. His description was that of 2 low flying military jets hitting their afterburners above the residential homes. The jets shook the foundations and rattled the window frames forcing the occupants to step outside to see if a plane was in distress. He then described over the phone only hearing the jets and never physically seeing them. What he did see was an erratic fast moving star sized object one half to one mile altitude making no sound as if it had escaped the jets and continued it’s evasive darting and circling flight pattern over the the Herndon/Sterling area. The jets flew within the vicinity for a second pass, but at this point nowhere near the strobe flashing object. His description of the object was a fast 3 pulse strobe of blue/white light followed by a quick single flash then returning to the 3 pulse strobe. The movement was extremely fast with quick turns and circles. The object was out of sight quickly as it is a residential neighborhood with a limited range of low altitude vision. The object was definitely outrunning and eluding the military craft. They wanted it and had no chance whatsoever do to the speed and maneuverability of this object. This object owned the sky! This area is a no fly zone for small general aircraft as we are 20 miles west of Washington DC and as mentioned the final approach for Dulles airport. Any military jet traffic is only for intervention and policing of this no fly zone. The low altitude of the jets scrambling in this vicinity would definitely be monitored by Dulles FAA authorities and force a change or alteration of incoming commercial air traffic. Being an almost daily MUFON reader I believed my son’s sighting was worthy of reporting.