Google Earth--Power Point
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Google Earth--Power Point






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Google Earth--Power Point Google Earth--Power Point Presentation Transcript

  • GOOGLE EARTH “ For anyone who has ever dreamed of flying….” – NY Times
    • The most popular virtual globe.
    • Developed by Keyhole, Inc. named as Earth Viewer
    • Bought by Google and renamed as Google Earth in 2005
    • uses broadband streaming technology and 3-D graphics to enable users to interactively explore the entire world
    • 3D buildings in major cities across the World 
    • 3D terrain showing mountains, valleys, and canyons around the world 
    • Integrated Google Local search to find local information such as hotels, restaurants, schools, parks, and transportation 
    • Fast, dynamic navigation 
    • Video playback of driving directions 
    • Tilt, rotate, and activate 3D terrain and buildings for a different perspective on a location 
    • Easy creation and sharing of annotations among users using KML (Keyhole Mapping Language)
  • 3D buildings
  • Public Transit
  • 3D terrain
  • GOOGLE EARTH - Specifications
    • Baseline resolutions
      • U.S.: 15 m
      • Global: Generally 15 m (some areas such as certain oceanic islands are in extremely low resolution)
    • Typical high resolutions
      • U.S.: 1 m, 0.6 m, 0.3 m, 0.15 m (extremely rare; e.g. Cambridge, Ma.)
    • Altitude resolution:
      • Surface:
      • Seabed: Not applicable (the seabed is "printed" on the spherical surface).
    • Age: Usually less than 3 years old.
    • Getting things done
    • with
    • Google Earth ….
    • The Technical Aspect
  • Getting things done with Google Earth
    • Three-dimensional geospatial data are managed in Google Earth using KML (Keyhole Markup Language)
    • KML files are often distributed as KMZ, zipped KML files
    • The KML file specifies a feature (a place mark, image, or polygon) for Google Earth
    • It contains a basic description of the place, longitude, latitude, tilt and other information
  • Getting things done with Google Earth An example to create pentagon polygon using KML <?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <kml xmlns=&quot;;> <Placemark> <name>The Pentagon</name> <LookAt> <longitude>-77.05580139178142</longitude> <latitude>38.870832443487</latitude> <range>742.0552506670548</range> <tilt>48.09646074797388</tilt> <heading>59.88865561738225</heading> </LookAt> <Polygon> <extrude>1</extrude> <altitudeMode>relativeToGround</altitudeMode> <outerBoundaryIs> <LinearRing> <coordinates> -77.05788457660967,38.87253259892824,100 -77.05465973756702,38.87291016281703,100 -77.05315536854791,38.87053267794386,100 -77.05552622493516,38.868757801256,100 -77.05844056290393,38.86996206506943,100 -77.05788457660967,38.87253259892824,100 </coordinates> </LinearRing> </outerBoundaryIs> <innerBoundaryIs> <LinearRing> <coordinates> -77.05668055019126,38.87154239798456,100 -77.05542625960818,38.87167890344077,100 -77.05485125901024,38.87076535397792,100 -77.05577677433152,38.87008686581446,100 -77.05691162017543,38.87054446963351,100 -77.05668055019126,38.87154239798456,100 </coordinates> </LinearRing> </innerBoundaryIs> </Polygon> </Placemark> </kml>
  • Result after opening the .kml file containing the code
    • It’s an approach
    • “ a way of thinking about the architecture of web applications using certain technologies” .
    • Ajax isn’t something you can download.
    • “ Asynchronous JavaScript +CSS + DOM +XMLHttpRequest ”
  • Ajax incorporates:
    • Standards-based presentation using XHTML and CSS (Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g. fonts, colors, spacing) to Web documents)
    • Dynamic display and interaction using the DOM Document Object Model
    • (The XML Document Object Model (XML DOM) defines a standard way for accessing and manipulating XML documents)
    • Data interchange and manipulation using XML and XSL Transformations
    • XSL (Extensible Style Sheet language) which is a language for transforming XML documents into other XML documents
    • Asynchronous data retrieval using XMLHttpRequest ;
    • XMLHttpRequest is the technical component that makes the asynchronous server communication possible;
    • And JavaScript binding everything together.
  • Example of AJAX NY see Google Maps with NYC Live Traffic Cams, Yahoo Traffic News and A9 Blockview Photos. AJAX gone wild, gotta love it. The traffic cams are not video, a more accurate description would be live streaming images (some refresh faster than others). http://www. alkemis .com/default.asp? pID =laboratory
    • Will Google Earth replace Arc GIS?
  • Will Google Earth replace Arc GIS?
    • The answer is certainly not.
    • They cannot be compared in this sense.
    • Google Earth focuses on presenting data rather than analyzing and processing.
    • The best approach will be to analyze data in Arc GIS and present them using Google Earth.
  • Will Google Earth replace Arc GIS? Analysis of data
  • Will Google Earth replace Arc GIS? Presentation of data
  • Will Google Earth replace Arc GIS? Analysis of data
  • Will Google Earth replace Arc GIS? Presentation of data
  • MS Virtual Earth
    • Combines real-world imaging with the usefulness of a traditional road map by letting people see aerial photos with an overlay of road networks and point-of-interest information
    • Uses Wi-Fi access points or Internet Protocol address geocoding to determine a person’s location
    • Provides users with a simple way to compile search results that can be e-mailed, copied into a document or even added to a weblog on MSN Spaces
    • Can be bookmarked, e-mailed to a friend or copied into a clipboard using Permalink
    • Users can query information in broad, flexible ways using “Yellow Page Directories” feature.
  • NASA World Wind
    • World Wind allows any user to zoom from satellite altitude into any place on Earth
    • It has a full copy of the Blue Marble, a spectacular true-color image of the entire Earth as seen on NASA's Earth Observatory: the Blue Marble
    • Can display a dramatic view of the Earth at eye level.
    • Can take animations and play them directly on the world
    • Is capable of browsing through and displaying GLOBE data based on any time the user wants
    • Has a complete set of borders that traces every country and state
    • Has a full catalog of countries, capitals, counties, cities, towns, and even historical references
    • Has a variety of visual guides that help the user's experience such as latitude and longitude lines, as well as extremely precise coordinate data
    • Has the capability to display actual 3d models of landmarks on the earth
  • Comparison No No No No No Yes  Yes Label overlay No USA Black and white Virtual Earth Yes    Yes Yes Yes Yes Yes Yes Graphical Overlay Yes World Color Google Earth No No No Yes Yes No No N/A Yes World Color World Wind 3D Terrain Coverage Application download Data import GPS device data import Drawing tools Tilt and rotate the view in 3D Get driving directions Search for schools, parks, restaurants, and hotels (Local search) Streets Images  
  • Comparison
    • Google Earth, Virtual Earth and World Wind are not entirely comparable, due to significantly different focuses and development history/philosophies
    • Though Google Earth is not a totally free and open source software (as is NASA World Wind), it is easier to use and also offers wide varieties of features.
    • Unlike any virtual globe, Google Earth provides data manipulation features and it allows users to access its API’s
    • Google Earth is popular among the masses so data presentation can be done easily and effectively.
  • Conclusion
    • ~12 Million Google Earth downloads.
    • 164,467 total registered users
    • 102 registered online
    • 1683 unregistered online
    • The above figure (unofficial) shows the popularity of Google Earth .
    • In general Google Earth is involving people into the field of
    • GIS.
    • At present Google Earth is used extensively by media for news
    • coverage and other things.
    • It is gaining equal importance among other fields aswell.
    • Arc GIS users and other GIS professionals can use Google Earth for
    • more better and effective performance.
    • Is GOOGLE EARTH the new face of a future GIS???