Geology Reference
In-Depth Information
Exercise 2 • Maps, Aerial Photographs, and Satellite Images
31
13. Identify the natural or built feature at each of the follow-
ing sites on Figure 2.14: Most can be identified without the
stereoscope.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J-
K.
L. (Select a Site)
M.
14. baseball field
15. oil and gasoline storage tanks
5. In which direction is the small boat traveling at the
entrance to Boston Inner Harbor?
6. Notice the diffuse white zone in the Mystic River, between
the first and second bridges. What might cause such a zone
in the river? What is your evidence from this photograph?
7. The Back Bay Fens is a swampy area that drains from the
south into the Charles River. A Fen is an alkaline bog. Given
this information, locate and mark the baseball field named
Fenway Park.
8. The L Street Beach, which is located west of the circular
bay in the SE quarter of the image, has structures that extend
into the Old Harbor. Give the name for these erosion control
structures and the direction of the longshore current in the
area.
14. What land uses are visible in the 1958 stereopair (Figure
2.14)? Are other land uses visible on the 1992 photographs
(Figure 2.15)?
9. Many elongated hills in this glaciated landscape have influ-
enced street patterns. In the NE quarter of the photograph is
Suffolk Downs Racetrack. What is the direction of elongation
(which gives the ice-flow direction) and the name of the land-
forms beneath the communities of Beachmont (1 cm E of the
racetrack) and Orient Heights (1 cm W of the racetrack)?
15. Use the definitions provided below to help determine in
which geomorphic feature site "J" (Figure 2.14) is located.
What is your evidence?
terrace (flat area near a river but above the river in elevation)
floodplain (low-lying area along a river that is flooded at
high water)
drumlin (rounded hill deposited by a glacier)
landslide (area where land has slid)
10. If the long axis of Suffolk Downs is 650 m (2100 ft), what
is the scale of the photograph?
16. a. In Figure 2.14 what is the distance between the middle
of the G to the middle of the H?
11. Tall structures can be identified by their shadows. At
what time of day (morning, noon, afternoon) in mid-April
1985 was the picture taken?
mm
b. Given that the scale of the photo is 1:14,400, what is the
distance on the ground between G and H?
Salt Lake City, Utah
The following questions refer to Figures 2.14 and 2.15. Figure
2.15 is a black and white stereo pair of aerial photographs
taken of the Salt Lake City area in 1958. Figure 2.15 (back of
topic) shows color aerial stereo photographs of an area south
of the black and white photographs. The color stereo pho-
tographs were taken in 1992. The area of Figure 2.15 is
included on Figure 6.10, the colored topographic map of the
Draper, Utah, quadrangle, which also is in the map section at
the back of this topic.
km
(there are 1,000,000 mm in 1 km)
17. Compare similar features on the black and white stereo
photographs (Figure 2.14) with those on the color stereo pho-
tographs (Figure 2.15).
a. Are the two sets of photographs the same or different
scales? What is your evidence?
b. What are some advantages of using color stereo pho-
tographs over using black and white stereo photographs?
12. Using a pocket stereoscope, examine the stereo pair in
Figure 2.14 to determine the nature of the landscape. The
shades of gray indicate vegetation or soil moisture differ-
ences. Identify a feature that shows:
a. darkest shading
b. lightest shading
c. intermediate shading
c. What are some advantages (if any) of using black and
white photographs over color photographs?
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