users several data visualization tools. These tools allow people to
"see" changes in water quality parameters without looking
directly at tables of numbers. Instead, the numbers are converted to
graphs and colored images that can demonstrate how the lake has behaved
over specific periods of time. The data visualization tools are found
by clicking on the "data" link on the home page.
have first specified which lake you want to investigate, you have the
option of selecting from a variety of data visualization tools. Most
of these tools require the use of a computer language called "Java."
Using java-based tools requires specific computer software and capacity.
PCs using recent (as of September 1999) internet browsers, such as Internet
Explorer 4.x or higher or Netscape 4.06, will be able to use the tools.
Macs have to use Internet Explorer with the Mac OS Runtime for Java
(MRJ) 2.1 plug-in added. (The recent Netscape 4.6 for Macs may include
the capacity to run Java).
the Profile Plotter:
1.Launch the Profile
Plotter applet. A new page appears with a graph and plot in it. In
top right corner a lake name is listed followed by a triangle pointing
down. If you click on this triangle you can select the lake you want
to view from a pulldown menu that appears. Select Grindstone Lake.
2. In the
boxes below you can select which water quality parameters you want to
investigate. Make sure the boxes for "Temperature", "O2
Concentration", and "Clear between plots" are checked.
If you see a check in another box, simply click in that box to make
the check disappear.
3. Now select
the date to investigate. The sliding bar under the date can be adjusted
by clicking and holding on the gray button in the slider control. While
holding the mouse down, slide the gray button until the date reads "Tue,
Aug 17, 1999."
4. Now move
your mouse pointer down and click on the "Get this Profile"
button and a new graph of temperature and dissolved oxygen will appear
for that date.
what two depths does the temperature make the most dramatic change?
6. If you
click on the >> button the plotter will advance through
each water quality profile that has been collected by the RUSS. After
clicking on the >> (fast forward) button you will see that
you have the option of clicking on a "Stop" button if you
want to pause the plotter to look at a specific graph. Click on the
7. On what
date does the 1 meter temperature first reach 15 degrees in the fall
of 1999? ______________________________
easy it will be to review many different sampling periods when you are
looking for changes in a water quality parameter.
the Color Mapper
at the Ice Lake Data Visualization page, select the "Color Mapper.
If your browser passes the test you will be able to launch the Color
2. You will
see that working with the Color Mapper is very similar to working with
the Profile Plotter. Use the pull-down menu to select Ice Lake.
3. Use the
sliding date scale to select Saturday, May 16, 1999(use the 6:00 CDT
sampling time) and select the button for "Temperature" for
the color map. Select the button for "pH" for the line plot.
the color pattern you see on the screen of the color mapper. ______________________
range is represented by the colors on the color mapper for Ice Lake
on May 16, 1999? _______________________
the color mapper forward in time by clicking on the fastforward (>>)
button. On what date does the water temperature at 1 m increase to 20
degrees Celsius? _____________________
you confirm the date you have selected through using the color mapper?
what happened to the lake temperatures during June. ___________________________________________________