Geology Reference
In-Depth Information
overlay it on the 1973 photo, and mark in pen the changes as
described for the tracing paper technique.)
b.
With a sharp pencil on the tracing paper, trace the base
of the bluff with a solid line and the shoreline with short
dashes. Label the figure "1954."
10.
Cover the 1954 photo with a half sheet of tracing paper
and secure it with paper clips or removable masking or clear
tape.
a.
Outline major streets within an inch of the east-west
road along the top of the bluff, to provide reference marks.
c.
Draw and label the groins.
d. Now construct six parallel reference lines approximately
perpendicular to the coast on the tracing paper so that we
can measure the actual change in the position of the bluff
FIGURE 11.4
Aerial photographs for 1954 (top) and 1973 (bottom) of Painesville Township Park, Lake County, Ohio
(Ohio Department of Transportation).
