Airliners-India.com Flickr Group & Facebook    FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How Google Earth images are made          Airliners-India.com Forum Index -> Non Aviation View previous topic :: View next topic   Author Message Aiel Member Joined: 19 Dec 2006 Posts: 927 Location: Bangalore Posted: Mon Apr 30, 2007 10:07 pm    Post subject: How Google Earth images are made Google Earth: From Space to Your Face…and Beyond Most people are surprised to learn that we have more than one source for our imagery. We collect it via airplane and satellite, but also just about any way you can imagine getting a camera above the Earth's surface: hot air balloons, model airplanes – even kites. The traditional aerial survey involves mounting a special gyroscopic, stabilized camera in the belly of an airplane and flying it at an elevation of between 15,000 feet and 30,000 feet, depending on the resolution of imagery you're interested in. As the plane takes a predefined route over the desired area, it forms a series of parallel lines with about 40 percent overlap between lines and 60 percent overlap in the direction of flight. This overlap of images is what provides us with enough detail to remove distortions caused by the varying shape of the Earth's surface. The next step is processing the imagery. We scan the film using scanners capable of over 1800 DPI (dots per inch) or 14 microns. Then we take the digital imagery through a series of stages such as color balancing and warping to produce the final mosaic for the entire area. We update the imagery as quickly as we can collect and process it, then add layers of information – things like country and state borders and the names of roads, schools, and parks — to make it more useful. This information comes from multiple sources: commercial providers, local government agencies, public domain collections, private individuals, national and even international governments. Right now, Google Earth has hundreds of terabytes of geographic data, and it's growing larger every day. And that's not counting the extraordinary "open source" projects people have built to enhance it. More info can be found here _________________ My Flickr photos My JP.net account Back to top the_380 Member Joined: 19 Dec 2006 Posts: 2329 Location: Mumbai, India Posted: Tue May 01, 2007 12:17 am    Post subject: My doubt answered finally Thanks a lot _________________ http://www.myspace.com/avsatsworld A Walt Disney and 20th Century Fox Audio Producer!!! Back to top sammyk Member Joined: 20 Dec 2006 Posts: 2719 Location: Austin, TX Posted: Tue May 01, 2007 6:31 am    Post subject: What was your doubt? Back to top the_380 Member Joined: 19 Dec 2006 Posts: 2329 Location: Mumbai, India Posted: Tue May 01, 2007 2:40 pm    Post subject: sammyk wrote: What was your doubt? The question in the title itself...how are Google Earth images made _________________ http://www.myspace.com/avsatsworld A Walt Disney and 20th Century Fox Audio Producer!!! Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         Airliners-India.com Forum Index -> Non Aviation All times are GMT + 5.5 Hours Page 1 of 1   Jump to: Select a forum New Members----------------Sign-up Guidelines Airliners-India----------------Civil AviationNon AviationTrip ReportsMilitary Aviation & SpaceInternationalAviation Polls & PreferenceTech/OpsAviation PhotographyEditorial/Analysis/ArticlesAviation HobbyAviation LawAviation Questions & CareersSite Related Flickr Group----------------Photo of the Month My Message Board----------------Pin Up  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © phpBB Group. Hosted by phpBB.BizHat.com