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Google Earth overview
 

Google Earth overview

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Speaking notes for a Google Earth tour and demonstration. I wanted to show my colleagues how GE can be helpful in civil, environmental, and related projects on a daily basis.

Speaking notes for a Google Earth tour and demonstration. I wanted to show my colleagues how GE can be helpful in civil, environmental, and related projects on a daily basis.

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    Google Earth overview Google Earth overview Presentation Transcript

    • G o o g l e Earth: Poor Man’s GIS, Fabulous Tool!
    • Where to Get Help and Info
      • Google Earth User Guide: http://earth.google.com/userguide/v4/
      • Google Earth Help Group: http://groups.google.com/group/earth-help/
      • Google Earth blog: http://www.gearthblog.com/
    • The Basics
      • Finding locations
      • Using layers
      • Adding locations and layers
      • Navigating
      • Getting coordinates
    • Opening View Searching for locations
    • Search for Location
      • Works like in Google Maps:
        • Named location or
        • Address or
        • Latitude and longitude
      • Zoom or “fly” to location by double-clicking
      • Save desired locations to “My Places”
    • Opening View Saved locations
    • Saved Locations
      • Same as any other file management:
        • Drag-and-drop
        • Create folders to organize site information
        • Give meaningful names
      • Anything under “My Places” will be saved
      • Anything under “Temporary Places” is gone after you shut Google Earth
    • Opening View Ready-Made Layers
    • Ready-Made Layers
      • Lots of pre-compiled information
      • Can make it really slow to load
      • Can make it confusing to navigate
        • Unselect most or all to navigate
        • Select only the ones you need, once you’re close to your location
    • Some Useful Layers
      • Geographic Web:
      • Roads
      • Borders and Labels
      • Terrain (3D effect)
      • Earthquakes
      • Volcanoes
      • Parks
      • Hospitals
      • Schools
      And as usual: Garbage in, garbage out (i.e., the databases are not 100% accurate)
    • Getting More Layers
      • National Wetlands Inventory: http:// www.fws.gov/nwi/WetlandsData/GoogleEarth.htm
      • USGS Earthquake Hazard Program: http:// earthquake.usgs.gov/research/data/google_earth.php
      • Humboldt Bay Trail network: http://www.green-wheels.org/node/313
      • Google Earth Gallery: http://www.google.com/ig/directory?synd=earth
    • Navigation - 1
      • Mouse left-click lets you pan: drag or spin the globe while your point-of-view remains fixed
      • Mouse right-click lets you fly: move your point-of-view up, down, and around a fixed location target
      • Scroll wheel lets you zoom straight in and out vertically
    • Navigating - 2
      • Sliders let you pan and fly as well
      • Double-click “North” to reset orientation
      • Vertical slider tilts the point-of-view
      • Arrows pan north, south, east, west
      • Numbers pad: + and – let you zoom straight in and out vertically
    • Getting Coordinates
      • For the new project initiation procedure, we’ll need project coordinates.
        • Navigate to the project site
        • Place your mouse cursor over the location
        • Read the latitude and longitude off the bottom status bar
    • Mouse cursor Coordinates
    • Fun Stuff
      • Inserting placemarks
      • Inserting polygons and paths
      • Measuring distances
    • Placing and Moving Points
      • Use different markers
      • Add labels and colours
      • Right-click to edit
      • Possible project uses:
        • Points of interest (e.g., water tank, hospital)
        • Sampling locations
    • Add Placemark tool button Marker style Add label and description
    • Proposed monitoring wells
    • Creating Polygons and Paths
      • Polygon: Closed shape, filled or outlined
        • e.g., Site boundary, building footprint
      • Path: Curved line, open shape
        • e.g., Road, trail, fault line, groundwater levels
      • Both can be drawn point-to-point or freehand (create lots of points)
      • Can edit, delete, add or move points
    •  
    • Measuring Distances
      • Line (btwn two points) or Path (multipoint)
      • Choose units: feet, yards, miles, etc.
      • Move the nodes to desired locations
      • Follows surface (“walked” distance)
      • Check “Mouse Navigation” to move around, then uncheck to continue measuring
    •  
    • The Really Cool Stuff
      • Importing maps, site plans, and aerial photos
      • Sharing files and collaborating
      • Saving images
    • Overlays 1: Inserting a Map
      • This is what you use when your map has latitude and longitude
      • Map needs to be in a recognized format, such as PNG , GIF , JPEG, BMP, or TIFF
      • Map needs to be in cylindrical projection (or small enough to be close)
      • Memory hog: keep your images small (<2000 x 2000 pixels)
    • Inserting a Map (Cont.) Find the map then convert it to the right format
    • Navigate to known latitude and longitude
    • Importing a Map (Cont.)
      • Show grid (under View drop-down menu)
      • Google Earth automatically re-projects cylindrical projection
      • Line up the map’s longitude and latitude using the handles
      • Slide image transparency to make it easier to align
    •  
    • Overlays 2: Inserting a Site Plan
      • More fiddly, inexact, but useful!
      • Same file formats
      • May need to capture a PDF or ACAD file and save it to a usable format
      • Include some reference points to line up with the terrain
    • Site layout from ACAD file
    • Inserting an Air Photo
      • Patching up the record with better or more recent air photos
      • Photos need to be ortho-rectified
      • Works the same as inserting a site plan
    • Air photo to fill obscured area
    • Google Earth jazz
      • Adding it all together, e.g.:
        • Draped maps over contours
        • Site map plus sampling locations plus wetland polygons
        • Project footprint plus fault lines
      • Support project decisions
    • Geology draped over terrain
    • Wetlands and wells
    • Sharing Google Earth Files
      • Keep your files organized
      • Save the folder containing files to share:
        • Points, polygons, paths, map overlays, photos
      • Saved as a single .KMZ file, can be kept in the project folder
      • Saves small, easy to e-mail
      • Other people can edit and re-save
    • Saving as JPEG
      • Allows you to save screen content as just an image (can’t edit points in Google Earth)