Assignment 2 Lab
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Feb 20, 2024
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7.5 x 50,000 = 375,000 / 100,000 = 3.8 kilometers
4.5 x 250,000 = 1,125,000 / 63,360 = 17.8 miles 4.5 x 62,500 =281,250 / 63,360 = 4.4 miles 1 x 24,000 = 24,000 / 12 = 2000 feet
8.8 Miles 14 Kilometers 4724 feet 90 miles 1.44 Kilometers
Yes, The graphic scale remains usable when the map is enlarged because the graphic scale itself is also enlarged proportionally maintain its accuracy for distance measuring. Yes, if the size of the map is relative to the ground changes, the fractional scale of the map will also change. The distances will have different lengths but they will represent the same distances. The left side of the scale has smaller subdivisions for measuring smaller fractional distances while the right side is used for larger distances. 1 km = 1000m, 1km = 100,000 cm 1 cm on the map = 100,000 cm actual distance 1cm = 1km 10” = 5 mi.
10” = 316,800 so 1” = 316,800/10
Scale = 1:31,680
Exercise 5 Problems—Part I
Compare the Mercator projection (
Figure 5-1b
) to a globe.
1.
Are all of the lines of latitude parallel to each other on both the globe and the Mercator projection?
Yes, all the latitude lines are parallel on the Mercator as well as on the globe. 2.
Do all of the parallels and meridians cross each other at right angles on the Mercator?
Yes, all the parallels and the meridians cross each other at right angles on both the Mercator and the globe. 3.
On a globe, the meridians converge toward the poles. Describe the pattern of meridians on the Mercator.
On the Mercator, all the meridians remain the same distance apart as they were on the globe. It doesn’t matter whether they are converging or not because it is just a matter of representation. 4.
Is the north always straight toward the top of the Mercator projection?
North is always at the top of the Mercator Projection. 5.
How would the North Pole be represented on the Mercator?
The North Pole is represented as a straight line on the Mercator Projection. 6.
Could a single graphic scale be used to measure distances on a Mercator projection? Explain.
Distances change near the poles as the poles flatten, therefore different graphic scales would be required. Study the Eckert projection (
Figure 5-1a
).
1.
Do all of the parallels and meridians cross each other at right angles?
No. The parallels and the meridians do not cross each other at right angles on Eckert projection because the
lines are curvy in nature. 2.
How does the Eckert maintain equivalence in the high latitudes (what happens to the meridians)?
The meridians converge towards the poles. 3.
What happens to the shape of Greenland?
With the Eckert projection, it becomes extremely distorted in size and shape. 4.
Is north always straight toward the top of the Eckert? Explain.
No not always. You would need to follow meridians around towards the north pole on the Eckert projection.
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Exercise 5 Problems—Part II
1.
Study the Goode’s Interrupted projection (
Figure 5-6
):
a.
Are ocean areas “left off” this map? Explain.
Yes, they are left off of this map. This map is only intended to show the continents. b.
The Goode’s is based on two different projections, one for the low latitudes and one for the high latitudes. At approximately what latitude does the projection change? (Hint: Look for the change in the shape of the map margins in the North Pacific.)
The projection changes at about 40°N and 40°S.
2.
On a globe, use a piece of string to find the shortest path between Yokohama, Japan (near
Tokyo) and San Francisco. This path is a “great circle” path. Two maps are shown here, a
Gnomonic (i) and a Mercator (ii)
a.
Is the path of the string on your globe the same as the heavy line shown on just one of these maps, or on both of these maps? (Hint: Look carefully at the string on the globe in relation to the Aleutian Islands of Alaska [at about , ].)
Yes, it is because the distance between two points on the globe is in a spherical shape. While both representations appear to be different, both images are correct. b.
In terms of a navigator trying to maintain a constant compass heading, why would the great circle path shown be difficult to follow exactly?
While traveling via ship in the ocean it isn’t possible to head in a curved circular direction. Because of weather, oceanic currents, and encountering possible islands, this makes it nearly impossible to travel. It is far easier trying
to head in a straight direction than it is a curved one also. c.
How would both a Mercator and a Gnomonic map be used together in navigation?
The gnomic projection is used first to determine the great circle route between
two points, and then the route is projected to transform the great circle to a curve on a Mercator Projection.
A. 70°F
E. 80°F
B. 55°F
F. 50°F
C. 80°F
G. 35°F
D. 72°F
H. 79°F
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