ASU camera yields best Mars map ever assembled

July 23, 2010

EDITOR'S NOTE: This article was chosen as one of ASU's highlights from 2010. Look here for a look back at some of the year's most prized stories.

The best Mars map ever made is now available online for planetary scientists and armchair astronauts alike. And citizen scientists are invited to help make it even better.

Websites developed recently at Arizona State University's Mars Space Flight Facility, in collaboration with NASA, the Jet Propulsion Laboratory and Microsoft, make it easy for anyone to trek the craters, volcanoes and dusty plains of Earth's small red neighbor world.

"We've assembled the best global map of Mars to date," said Philip Christensen, Regents' Professor of Geological Sciences in the School of Earth and Space Exploration, part of the College of Liberal Arts and Sciences. "And we made it available via the Internet so everyone can help make it better."

The map is accessible as an interactive">">interactive zoomable global map, which is the easiest for most viewers to use. (Advanced users with large bandwidth, powerful computers and sophisticated software capable of handling gigabyte images can download">">download the map in sections at full resolution.)

The maps show Mars as if sliced from a globe, unwrapped and flattened out on a table. Nearly 21,000 individual images have been smoothed, blended, fitted together and cartographically controlled to make a giant mosaic that web viewers can zoom into and scroll around. The few missing pieces show where clouds and poor lighting have thus far prevented map-quality imaging; these places are high on mission planners' must-image target list.

"Portions of Mars have been mapped at higher resolution," said Christensen, "but this is the most detailed map so far that covers the planet."

All the map images come from the Thermal">">Thermal Emission Imaging System (THEMIS), a multi-band infrared and visual camera on NASA's Mars Odyssey orbiter. The smallest surface details visible when you zoom all the way in are 100 meters, or 330 feet, wide.

The 100-meter map has been in the making since THEMIS observations began eight years ago. "We tied the images to the cartographic control grid provided by the U.S. Geological Survey, which also modeled the THEMIS camera's optics," said Christensen, who is the principal investigator for THEMIS. "This let us remove instrument distortion, so features on the ground are correctly located to within a few pixels."

The new map lays the framework for global studies of properties such as the mineral composition and physical nature of the surface materials. In addition, it is helping NASA mission planners choose targets for aiming instruments on the Mars Reconnaissance Orbiter. And the map also plays a role in evaluating potential landing sites for NASA's next Mars rover, the Mars Science Laboratory, due for launch in late 2011.

Making the good even better

But every map, however good, still can be improved and this is no exception. "Computer-made maps have gone about as far as they can," Christensen said. "Now it's the turn for citizen scientists."

“With the help of people from around the world, we can increase the accuracy of the global Mars map for Red Planet explorers everywherem" he added.

NASA's "Be">">Be A Martian" website, developed in cooperation with Microsoft, offers an easy and engaging way for would-be Mars mappers to do exactly this. ASU is regularly contributing newly taken THEMIS images to the Be A Martian "Map Room," where the public can help by hand-aligning new images, placing them within a pixel’s accuracy.

Mars mission album

The origins of the new global map lie in the work of previous Mars missions, which began imaging the Red Planet decades ago. Two new websites developed at ASU provide a wide window into the gigantic collection of images taken by earlier Mars missions.

"These websites present all the images taken by cameras aboard Mars-orbiting space probes, starting with Viking in 1976," Christensen said. "The image collection, regularly updated, also includes those from current missions, such as Europe's Mars Express, and NASA's Mars Odyssey and Mars Reconnaissance Orbiter."

The new Mars Image Explorer, he said, lets viewers find images in either of two ways. Viewers can click on a map of Mars – or they can specifying various key properties such as latitude and longitude, spacecraft orbit number, date or viewing conditions. Viewers can check out the Explorer by selecting">">selecting key properties or by clicking on a">"> mission-specific Mars map.

The broad purpose underlying all these sites is making Mars exploration easy and engaging for everyone, Christensen said.

"We're trying to create a user-friendly interface between the public and NASA's Planetary Data System, which does a terrific job of collecting, validating and archiving data. Our focus lies in providing easy access to Mars images for the general public and scientists alike." Valles Marineris on Mars Download Full Image

Robert Burnham

Science writer, School of Earth and Space Exploration


Tsosie published in ‘Tulsa Law Review’

July 23, 2010

An article by Professor Rebecca">">Reb... Tsosie, “Native Nations and Museums: Developing an Institutional Framework for Cultural Sovereignty,” has been published in the Native American Law Symposium edition of the Tulsa Law Review.

Tsosie observes that, although issues of tribal political sovereignty have preoccupied most legal scholars focused on tribes, cultural sovereignty has received less attention. Cultural sovereignty can be forged from within a tribe, and it evolves from each tribe’s unique sense of history, identity and place, according to Tsosie. Because cultural sovereignty can be advanced through repatriation of ancestral remains and cultural artifacts, museums often are the place for dialogue about cultural sovereignty, and therefore, museums can play an important role in reconciliation. Download Full Image

To read the article, click here.

Tsosie">, a Willard H. Pedrick Distinguished Research Scholar and Executive Director of the College’s Indian Legal Program, teaches in the areas of Indian law, Property, Bioethics, and Critical Race Theory, as well as seminars in International Indigenous Rights and in the College’s Tribal Policy, Law, and Government Master of Laws program. She is a Faculty Fellow in the Center for Law and Global Affairs, and an Affiliate Professor in the American Indian Studies Program at ASU. Tsosie has written and published widely on doctrinal and theoretical issues related to tribal sovereignty, environmental policy and cultural rights, and is the author of many prominent articles dealing with cultural resources and cultural pluralism.

Janie Magruder, Jane.Magruder">">
(480) 727-9052
Sandra Day O’Connor College of Law