7. The latitude of the upper right (northeast) corner of the map is 35°30\' N, w

Question

7. The latitude of the upper right (northeast) corner of the map is 35°30' N, while the longi- tude of the lower left (southwest) corner of the map is 11000' W. Why is this called a "7.5 minute" topographic map? (Hint: What is "minute" referring to?) 8 At the time this quadrangle was printed, what was the difference (in degrees) between true north and magnetic north for this map? degrees 9. On all three graphic scales for the map, "0" is not at the far left. Explain the reason for this. 10. Using the graphic map scales, determine the maximum width of the eastern Twin Butte (use the 6100' contour to be the outer edge of the butte). feet kilometers

Explanation / Answer

7. The 7.5 minute topographic maps are also known as Quadrangle maps. A the name suggests the map consists area in a "quarter" of a degree of longitude (N-S lines).

8. 100 17' (you can see the declination in the bottom left of the map)

9. To show smaller units , for example, to show 500m in the map, we can use the more graduated scale to the left instead of using the 1 km scale for more efficiency. Hence the zero in not at the left of the scale.

10. The length of the feature in map is 14.5 cms, hence 14.5*24000= 348000cms= 348meters (1141 feet)

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