Google Earth™ is Google’s satellite imagery-based mapping product that combines global coverage of imagery with new navigational features including integrated Google search capabilities. It is based on technology from Keyhole, a company acquired by Google in October 2004. Google Earth is a broadband mapping tool that enables users to fly from space to street level views to find geographic information, and to explore places around the world.
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Google Earth is a popular and widely used geographical browser. It is a standalone application that enables spatial data from a variety of sources to be displayed, explored and visually compared. Google Earth has the following important characteristics:
• Free
• Easy-to-use and intuitive user interface. Data are displayed on an interactive globe that can be rotated and zoomed to visually explore data in different regions of the world and at different spatial resolutions.
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A number of new geospatial viewing tools from major players in the Internet industry have recently appeared on the scene and are taking the geospatial world by storm. Google,Yahoo, Microsoft, and Amazon have all released web-based mapping tools in the recent past, and collectively these new players to the industry have raised the bar for Internet mapping. Although their functional capabilities don’t provide anything we haven’t seen in web offerings from traditional GIS vendors, their emergence has been significant in that they have managed to capture a wider audience. Google, in particular, has emerged as the leader of this pack with it’s recently released Google Maps product which provides a slick, highly responsive visual interface built using AJAX technologies along with detailed street and aerial imagery data, and an open API allowing customization of the map output including the ability to add application specific data to the map.
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Google Earth is a virtual globe program, allowing viewers to visualize data on top of displayed satellite images of the Earth’s surface. Launched in 2005 and released to the public in 2006, Google Earth fast became a household name hailed as a revolution for humanitarian development, much as Geographic Information Systems (GIS) were several decades ago. According to MapAction, “There seem at present tobe two distinct groups of humanitarian practitioners: those who are already, albeit tentatively,exploiting Google Earth and related geospatial methods in their work,and those whowill be, as soon as they see their first demonstration of its potential.” (MapAction, 2008: 9)
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The MrSID Stand Alone Viewer displays images that have been encoded into the MrSID format. Each MrSID image file contains data from multiple resolutions stored in a single pixel database. The MrSID Viewer starts viewing an image at the smallest resolution view, and allows complete control to zoom, pan, navigate and investigate through larger and smaller zoom levels. The Viewer uses Selective Decompression” to decode only the portion of an image necessary for viewing. This makes rapid viewing of large images possible, while maintaining maximum image quality. With the MrSID Stand Alone Viewer, you can also export any part of the image to TIFF at any resolution.
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