Environmental Engineering Reference
In-Depth Information
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Student Exercises
Classroom Exercises
Classroom Exercise #1: Evaluating Wetlands in Google Earth
Developing a familiarity with Google Earth is a good starting point for many
mapping projects. This exercise guides you through the use of Google Earth to
evaluate the Molera Wetland for this and the following exercises.
1. If you do not have Google Earth installed on your computer, follow this link
http://www.google.com/earth/index.html
to download the program.
2. To find Molera Wetland, paste the following longitude and latitude coordinates
into the search window: 36
46
0
20.93
00
N, 121
47
0
18.60
00
W. The wetland parcel is
bounded on the north by the Tembadero Slough and on the west by the historic
Salinas River channel. It is bounded on the south and east by roads.
3. Click on the year at the bottom of the screen and you will get a time slider at the
top that can be used to choose the dates of various images. In the case of the
Molera Wetland and at the time of writing this exercise, there were several
images available from 1993 to 2012. The images vary in terms of resolution and
number of color bands.
4. Molera Wetland was constructed as a water treatment wetland. To accomplish
that goal, it consists of an elongate, sinuous channel in the southern part and an
open water wetland in the northern part. Use the time slider to determine when
the land use changed from agriculture to wetland. Note how the “wetness” of the
open wetland changes through time. Can you determine if the wetness changes
are more related to season differences or annual differences?
5. Select an aerial image year that shows the wetland very wet (e.g., May 2011).
We will make a rough estimate of open wetland size in that image. Click on the
ruler icon at the top of the Google Earth page.
