Google Earth the next tool to present surveying data by izy20048

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									Google Earth the next tool to present
         surveying data?
          By: Jacob Dunham
        Ferris State University
         What is Google Earth
• Google Earth allows your computer to become a window
  to anywhere on the planet, viewing high-resolution aerial
  and satellite imagery, elevation terrain, road and street
   labels, business listings, and more.
  Revolutionary User Interface

• No need to load (open) your data files.
• This files are loaded automatically by
  zooming-in to the location
• Images and data can be retrieved on-the-fly
  from Google’s server
        Google Earth, Using Layers
• The Layers feature provides the ability to select and
  display different themes over your viewing area. This
  includes points of interest as well as map, road, terrain,
  and even building data.
• The most commonly used layers are available on the
  Navigation pane, and the full list of layers is available
  in the Layers pane.
             Get Google Earth at:
                http://earth.google.com/
• Google Earth - Free Version
   –   View the Google images and vector databases
   –   Enter your own images
   –   Measure distance
   –   Print maps with Longitude and Latitude Grid lines
• Google Earth Plus - $20
   – Plug in your GPS device to see your trek/location (Geographic
     Coordinates)
   – Import a spreadsheet of houses on the market.
   – Draw 3D objects.
   – Print high-resolution maps of locations
• Google Earth Pro - $400
   – Import Shape files
   – Copy and paste data
Google Earth, Image Overlays
– The Image Overlay feature can be used to place
  custom images (aerial photographs, images from the
  Michigan Center for Geographic Information System
  (at http://www.mcgi.state.mi.us/mgdl/)
  over the 3D view of the earth.
– One can make the images partially transparent.
– Use prominent features (e.g. rivers, roads) to align
  the image
– Image overlays provide additional information about
  the underlying project area. For example, you can:
    • Use publicly available image maps (or create
      your own image maps) for such things as hiking
      trails, camping spots, theme parks, fishing
      locations, national park boundaries, and more.
    • Use imagery of a site plan and parcel
      boundaries to view the development stages over
      a particular parcel.
New Image Overlay
Align the image (shrink,
    rotate and move
Google Earth, Measuring Areas and
             distance
           •       Google Earth offers a number
                   of tools that you can use to
                   measure distances and areas.
           •       Depending upon which
                   version of Google Earth you
                   are using, you have access to
                   the following tools:
               –      Measuring with a line or path (all
                      Google Earth versions)
               –      Measuring area or circle radius
                      (Google Earth PRO)
               –      Drawing a path or polygon
                      shape in the 3D viewer (Google
                      Earth PLUS and Google Earth
                      PRO)
Google Earth, import data
 – The Data Import feature of Google Earth can be
   used to import geographic data and view it over
   the earth imagery
 – Two basic kinds of data can be imported:
 – Vector Data:
   Vector data consists of points, lines, paths, and
   polygons.
     • ESRI’s shape files, Microstation (*.DGN), and
       generic text files.
 – Imagery Data:
   You can import imagery data such as aerial maps
   or topographical maps including: GeoTIFF, and
   Erdas
 – The data should be projected to Geographic
   coordinates (Longitude and Latitude)
Google Earth, with GPS Devices
• If you have a GPS (Global Position System) device,
  you can connect it to your computer and import your
  waypoint and track data into Google Earth.

• Google Earth categorized your data into three possible
  folders:

   – Trackpoints:
      • Trackpoints are the points automatically recorded by the GPS
        device periodically along the recorded route. They can be
        imported into the Google Earth application as paths.
   – Waypoints:
      • Waypoints are points entered manually by the user and typically
        marked with a name, such as "home" or "turnaround point."
   – Routes:
      • Route points are those points that the GPS device uses to creating
        the routing, such as when you instruct the device to "go to" a
        recorded point from another recorded point. Route points can
        contain multiple connected "go to" instructions. They can be
        imported into the Google Earth application as paths.
        Google Earth
• Geological and Geographical uses
  Mapping of: Volcanoes, earthquakes,
  and other important things
        Google Earth and DEMs

•   Google Earth allows for the viewing of DEMs
•   You can adjust the appearance of the terrain if you would
    like the elevation to appear more pronounced. To do this you
    only have to change the Elevation Exaggeration value
Google Earth, 3D maps and flythroughs
                  Conclusions
• Google Earth has just came out and it is already a
  popular software tool.
• More data and images are going to be incorporated in
  the free version.
• More people are going to be using the tool!
• Surveyors and Engineers should be familiar with the
  tool if only to be able to interact with their clients.
• It may become the next platform for surveying and
  mapping data visualization.

								
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