Using Google Earth to Estimate Shoreline Erosion History
When evaluating a shoreline for possible implementation of a living shoreline project, one of the most important site characteristics to assess is the erosion history of the site. An easy and free way to do this is to use Google Earth and Microsoft PowerPoint.
Using these tools, you should be able to quickly determine if a site has been experiencing erosion or if it is relatively stable. You may also be able to determine the cause of erosion at a site using this activity alone or in combination with property owner interviews.
This guide serves as a step-by-step tutorial to help anyone to be able to do shoreline erosion assessments using this common software. However, this is a rough evaluation of erosion at a site. It should not be used to measure exact erosion rates or amount of land lost.
How is this exercise helpful for living shoreline decisions?
Erosion history can indicate:
- Suitability for living shoreline implementation
- The need for wave-breaking structures
How to download Google Earth
- Go to www.google.com/earth. This example uses Google Chrome, but other browsers will also work.
- Select “Earth Versions.”
- Select “Google Earth Pro on desktop.”
- Select “Download Earth Pro on desktop.”
- Select “Accept & Download.”
- Click the execute command and select “Yes” to allow changes to your computer.
Welcome to Google Earth!
- Enter location into search bar.
- Go back in time. In this example, 1992 is the date chosen.
- Zoom in as much as possible while still being able to discern the shoreline.
- Can zoom in by pressing the plus button, scrolling up with the mouse wheel, or zooming in on a touchpad.
- Save the zoomed-in image. Be sure to include the year in the name of the picture file!
- Set picture as slide background in PowerPoint.
- Select “Format Background.”
- Select “Picture or texture fill,” and then Insert picture from “File…”
- Get rid of text boxes.
- Choose “Layout.”
- Choose the “Blank” slide option.
- Trace shoreline.
- Choose the free draw tool.
- Use your mouse to draw along the shoreline.
- To change the color and width of the line, choose “Format Shape.”
- Trace reference line.
- Group the tracings together.
- Select all by holding down shift and clicking each.
- Choose “Arrange,” and then “Group.”
- Save a later image from Google Earth.
- Set the second image as the background on a new PowerPoint slide. (See step 5 for instructions.)
- Add the shoreline tracings from the first image to the second image.
- Select the tracings in the first image, and then select “Copy.”
- Go to the new image and paste.
- Use your reference lines to adjust your shoreline tracing.
- Use the rotate button to rotate the image by dragging in the direction needed to line up your reference lines.
- By dragging the dots, you can change the shape, width, and height of the grouping.
- How to interpret the pictures: The space between the shoreline tracing and the more recent shoreline is the area of erosion.
For more information
Visit http://masgc.org/living-shorelines or email firstname.lastname@example.org.
The information given here is for educational purposes only. References to commercial products, trade names, or suppliers are made with the understanding that no endorsement is implied and that no discrimination against other products or suppliers is intended.
Publication 3357 (POD-05-19) MASGP-19-029
By Sara Martin, Extension Associate, and Eric Sparks, PhD, Assistant Extension Professor, Coastal Research & Extension Center.
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