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
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“For anyone who has ever dreamed of flying….” – NY Times
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)GOOGLE EARTH - FEATURES
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.)
Seabed: Not applicable (the seabed is "printed" on the spherical surface).
Age: Usually less than 3 years old.GOOGLE EARTH - Specifications
The Technical Aspect
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 informationGetting things done with Google Earth
<?xml version="1.0" encoding="UTF-8"?>
An example to create
pentagon polygon using KML
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;
NY seeGoogle 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).
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.MS Virtual 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 earthNASA World Wind
The above figure (unofficial) shows the popularity of Google Earth.
In general Google Earth is involving people into the field of
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.