Two 45-minute sessions. (If students make measuring strings in one session)
Grade Level: 4-8
scientific processes, energy, scale and structure, communication, comparison, measurement, classification, sequencing, organization, recording, interference and synthesis
scale, structure, proportion, perspective, point of reference, span, reflection, distance, silhouette, detail, coordinates
Grouping: Groups of 3
Materials Per Group:
Cut measured lengths of yarn for students to tie knots or place tape markers at 5 meter intervals, up to the length of your playground. In order to make this preparation, a class period in math could be utilized and integrated with this remote sensing lesson.
You will need enough yarn or string to have one length for every 6 students.
Have enough overhead or erasable pens to have one for every three
students in your class.
USGS maps with coordinates, maps with grids
You may use several of the images on remote sensing already in the other lessons for application in this lesson.
Yarn/string may be donated by a local sewing shop or garden supply store.
Images from the OTTER CD-ROM, volumes 1-5. NASA , "Oregon Transect Ecosystem Research Project - Satellite, Aircraft and Ground Measurements".
CD-ROM "Small Blue Planet", What Now Software, 2303 Sacramento, San Francisco, CA 94115
If it is possible, you can place enough markers on the playground, using a rotating measuring wheel ahead of time.
Students can then make a team study of an object, such as a tree, using all of
the techniques learned up to this point which include temperature measurements,
reflective patterns as seen through diffraction lenses and spectroscopes,
shadow analysis, distance, angle of light, intensity and colored filter
Each team will complete a study made on the selected tree over a period of
time, recording times and as much data as possible from the ground.
Illustrations and diagrams of what it would look from the air and how it looks
from the ground are to be included.
A grid map of the area surrounding the object with the measurements of the
object and perimeter is also a component of the report prepared by each group.
Students can use string and popsicles sticks to delineate on the ground a scale
grid on their object. If yarn and sticks are not available, use hardware store
string for chalk marking. Sprinkle the chalk dust into the container, pull
string out over the area selected. Snap the string onto the surface to leave
the line of chalk on it. Measure the next location for the line and do the
same process, until your grid is complete.
Using images from OTTER, and other mapping remote sensing images of Earth,
examine several images of landscapes to identify the altitude at which trees
are identifiable as individual trees/objects vs. a color image of the
temperatures of the tree against its surrounding area.
How does the exercise on the grids apply to the remote sensing technology?
What is the use of having proportional grids and how can they be applied in