March 1, 2007 By Chad Vander Veen
He takes satellite reconnaissance, aerial surveying and global GIS mapping -- eye-glazing subjects for most people -- and transforms them into popular and revolutionary applications. Ohazama, who helped develop Google Earth, has given average people a near superhuman ability -- to fly around the world in mere seconds, to roar through the deepest canyons and soar to the highest mountains -- all with a few clicks and drags of the mouse.
Prior to building Google Earth, Ohazama spent several years toying with 3-D graphics. After earning a bachelor's degree in biomedical engineering at Vanderbilt and a Ph.D. in the same field from Duke, Ohazama helped found Keyhole Corp. in 2000, where he explored combining powerful graphics with geospatial data. The inspiration for what would become Google Earth came from a demonstration of a program called Space-to-Face, built by Silicon Graphics Inc. (SGI).
"The idea was out there with a demo from SGI to bring this technology -- which used to only be on multimillion dollar machines and high-end 3-D graphics systems and so forth, and requires a lot of hardware -- to the masses," Ohazama recalled. "With the advent of consumer 3-D graphics, a lot of progress was made by [3-D graphics developers] ATI and Nvidia, and taking that technology along with the Internet and using these technologies to bring the GIS imagery technology to the [public]."
Seasoned Google Earth users probably find that peering into one's own backyard -- followed by neighbors' backyards -- is the first order of business, then maybe viewing a childhood home or school. Soon they're revisiting favorite vacation destinations, exploring the natural wonders of the planet or searching for proof of extraterrestrials in the vast expanse of the Nevada desert that's home to the infamous, officially nonexistent Area 51.
As Google Earth users explore the planet as they never have before, they may begin to wonder just where all this imagery comes from. Those who think they're in the know say it's a bunch of satellite images stitched together. That, it turns out, is only part of it.
"The imagery comes from a variety of sources ranging from Digital Globe [a private satellite imagery firm], as well as aerial photography companies that take imagery of different areas," Ohazama explained. "We also get a lot from free data sources. The USGS [U.S. Geological Survey] and the USDA [U.S. Department of Agriculture] are doing major flyovers for coverage, whether for agriculture, general GIS or mapping for the government." The imagery is available free online, he said, adding that Google gets imagery from small municipalities and states.
Google Earth was born as a project called "Earth Viewer," which was Ohazama's effort to bring a sophisticated, largely inaccessible technology to the general public in a simple, easy-to-use format. The format would also need to run using the average consumer desktop graphics-rendering capability.
For Ohazama, the challenge was dealing with the massive amounts of data that photographic mapping of the Earth required. Further, if he solved that problem, Ohazama still had to build an application people would want to use.
In 2004, Keyhole was acquired by Google, and in 2005, Earth Viewer was renamed Google Earth. Since then, Ohazama has served as project manager and continues to refine Google Earth so the average user gets more out of it. One recent development was the advent of true 3-D terrain.
For example, a user can fly over the Himalayas and tilt the viewing angle to reveal the elevation and relief of the mountain range. As the perspective changes, Mount Everest begins to rise higher and higher, tearing into the clear, virtual blue sky.
Numerous cities have received the 3-D treatment as well -- after careening through the Grand Canyon, users can soar through the
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