A journey of a thousand miles begins with a single stepLao Tzu
Choose a spot on a map and you are there — immersed in a panoramic view you can move and zoom. Since 2007, Google Maps with Street View has transformed our ideas about going places, from faraway lands to a restaurant across town.
Computerized, interactive “movie maps” go back 35 years. Today’s connected computer power is turning tools that were once the province of artists and visionaries into a part of everyday life.
Vintage Street Views
In April, 1906, a filmmaker named Earl Miles attached a movie camera to the front of a trolley in San Francisco and filmed all the way from mid-Market Street down to the Ferry Building. Pedestrians in hats wander across the tracks mixing chaotically with horse-drawn wagons and flimsy-looking early automobiles. He advertised the footage for sale in a film magazine.
Less than a week later, the great earthquake and fire destroyed most of what the camera saw, and killed or made homeless many of the people who had stared curiously into its lens. The photographer’s own offices on Market street were destroyed, and if the film hadn’t been shipped off to New York the night before the quake it would have been, too. Today, this footage offers an excruciatingly poignant glimpse of what it was like to wander through a lost world.
Video: A Trip Down Market Steet, Then and Now
From cave paintings to 1950s 3D movies, artists and photographers have long used the best techniques at their disposal to immerse viewers in a distant scene. One 16th century Chinese panorama of a famous battle stretched 85 feet. Cycloramas – round rooms with realistic views painted on the inside – were popular tourist attractions in the 19th century.
An early use of the movie camera was for virtual walks down city streets, like the fateful 1906 tour of Market Street. In the 1970s, California filmed all the state’s main highways from a car-mounted camera.
The practical side of street views has a history, too. Before roads had consistent names and signs, landmark-by-landmark photo guides called Photo-Auto maps were one effective way to specify a route for the early motorist.
With traditional panoramas and movies, the viewer can only see a predetermined scene or route. By adding computer control, MIT’s 1978 Aspen Interactive Movie Map changed all that. In this stunning touchscreen-controlled drive-through of Aspen, Colorado the viewer was in charge of the tour and could go wherever he or she wished. The project pioneered basically all of the features of street view and other mapping services today, including navigation buttons for turning and moving, integration with flat maps and aerial photography, computer-generated panoramas, and 3D models of buildings.
The Aspen Movie Map was funded as a way to familiarize soldiers with remote locations – “surrogate travel”. It was inspired by the success of the Israeli raid on Entebbe in 1976, where commandos successfully freed hostages after practicing on a mockup of the real location. The technology was cutting-edge for the time. Nicholas Negroponte of the Architecture Machine Group at MIT (later the Media Lab) realized that the newly developed laserdisc player – which used shiny disks like giant DVDs – could do far more than play videos start to finish. By controlling it with a computer you could create customizable multimedia, with endless links and branches chosen by the user. Selecting a building in the Movie Map worked like a modern Web link and let users get more information, or even go inside.
Video: Aspen Interactive Movie Map, 1978-1981.
Credit: MIT Architecture Machine Group
To capture Aspen’s streets, project leader Andrew Lippman and cinematographer Michael Naimark customized a set of stop-motion animation cameras on a car’s roof to snap a full panorama roughly every 10 feet. Each shot was logged in a computer database. When the eventual user wanted to “move” a specific direction, the computer would call up the appropriate shot from the laserdisc player.
The Aspen Movie Map was ahead of its time. There were several efforts to start companies based on the technology, and a brief flowering of 1990s interest in computerized panoramas using Apple’s QuickTime VR (“Virtual Reality”). But street views remained mostly a niche product for art or the occasional display for tourists until the 2000s.
Google Takes to the Streets
In 2003, Google co-founder Larry Page got intrigued with the idea of capturing street level views at massive scale. After shooting test footage with a video camera from his own car he funded a project at Stanford to develop techniques.
By 2005 Google had bought the companies that became Google Maps and Google Earth. Street View joined them in the same building, with Frenchman Luc Vincent coordinating the part-time efforts of a number of Googlers. The team experimented with high speed video cameras before settling on panoramic cameras like the early movie maps. The prototype van was filled with so much equipment it required a separate generator. The custom cameras were protected in an ominous-looking turret.
It all worked, in fact so well that the van quickly made itself obsolete. As soon as the company decided to go ahead with Street View at full scale, the custom installation was replaced with a more minimalist rig that could be quickly fitted to standard cars.
The service launched in 2007 as several other street view efforts were ramping up world-wide, including City8 in China, Everyscape in the U.S, and Location View in Japan.
Cheap computer power and storage had made street view services practical. Even more important, high-speed networking and the World Wide Web made them accessible. Early interactive movie maps required expensive custom equipment and high capacity data disks for each stand-alone user. By the mid-2000s, millions of people could realize the once-exotic dream of “surrogate travel” through an ordinary Web browser.
The Longest Road Trip
Beginning with views of four selected U.S. cities in 2007, Google Maps with Street View has grown to cover major streets in over 39 countries, or more than five million miles of road, path, track, trail, and even museum hallway. It is the leading street view service world wide.
Local drivers work as contractors to Google all over the world, some logging tens of thousands of miles. For special projects, the company uses trikes, snowmobiles, hand-pushed carts, and even a backpack to map the paths and indoors spaces that cars can’t reach. Google planes have also started filming 3D views from the air.
The hand-pushed Street View camera cart saw first use in 2009 at Iraq’s National Museum, which houses some of the world’s most important artwork and artifacts from early civilizations. The Museum was partly looted in the aftermath of the 2003 U.S. invasion of Iraq.
Video: Luc Vincent, Director, Engineering, Google Inc. talking about the early days of Google Maps with Street View
A Simple Idea – Massively Scaled
Like the original movie map projects, Google Maps with Street View drives cars equipped with roof-mounted camera clusters down streets. The driver checks reference shots on a screen, and can see both streets covered and those to be done on a moving map.
The panoramic cameras, now in their seventh generation, are tough and reliable. They take a set of pictures in every direction at known intervals, usually every nine to 15 feet. Beyond measuring the distance between shots, the cars use laser rangefinding, GPS, and image analysis to precisely determine the position of each picture and to later correlate it with Google Maps and Google Earth.
After the camera’s hard disks are sent back to Google comes the hardest part – the processing that wasn’t cost-effective on a large scale until recent years. Custom software automatically “stitches” the separate photos taken together into a single panorama, and creates transitions between each set of pictures when you virtually move down the street.
The company also uses Street View to refine Google Maps. Special software analyzes the photos for readable signs and correlates them with the Maps database of businesses, street names, and house numbers.
Privacy in a Global Village
We all know streets are public. But there’s a big difference between being seen in the moment or just by those nearby, and having your public self recorded and potentially seen by millions. This tension has been a part of street view projects since the 1970s. In response to both public and government pressure, many services including Google’s now blur faces and license plates automatically, and remove other things – from nudity to a sensitive military base – on request.
Privacy norms and laws also vary by country. Far more German households opt to blur their property than elsewhere. Japan limits camera height to avoid topping walls. Russia doesn’t restrict public photos, and nothing is blurred in street views by search engine Yandex.
Since Street View’s start, a number of Web sites have sought and shared sexy, humorous, and shocking images recorded by the roving cameras. A small percentage of these are staged, from mock fights to flashing: being recorded brings out the ham and the prankster in some people.
After Google Maps with Street View toured the streets of Pompeii, the excavated Roman city that was buried with volcanic ash in AD 79, real-world visits went up 30%. Similar stories hold for other attractions. Many people reflexively check the street view of a restaurant, apartment for rent, or new friend’s house before visiting in person. Most of us have looked at our own home online.
From armchair travelers to real estate agents to tax collectors, street views are subtly but deeply changing the ways we think about going places – and the facades we show to the world.
Street views can also be an important public record; from information for new zoning, to helping rebuild more safely after the 2011 earthquake and tsunami in Japan.
The Road Ahead
The first interactive movie maps go back more than three decades. What will the armchair traveler see 30 years from now?
Street views remains one of three very different ways of representing places: flat maps, three-dimensional models like those in games or Google Earth, and photographs of the world as it really appears like Street View.
The three are converging. As 3D models get better, the artificial views they produce rival actual photographs. Conversely, Google and competitor’s technology for mapping street views onto three-dimensional models also improves.
Then there are historical views. People have long been fascinated with comparing the same scenes as they change over time, and computers can now automatically map photos to their place and viewing angles in the real world. So tomorrow’s street views may not only give us “surrogate travel” in space, but also in time.
What about video? Current street views are static, as if time had stopped. As video sources multiply, from CCTV to private smartphones, future services may bring in not only photos but live feeds from all over the world.
Augmented reality promises to flip the whole process, and bring more and more computer-linked information to the real world as you walk through it.
The Going Places exhibit will be on display at the Computer History Museum from June 23, 2012 to August, 2013.