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Laboratory 1

Topographic Maps

CE 342Geology Dr. John SchuringSpring 2015

Lab Manual Questions: Chap. 7: Pg. 95-100; Problems 1, 3, 4, 5, 7, 9.

Supplementary Problem: Quad Sheet Interpretation. The following questions refer to the USGSHackettstown, NJ Quad Sheet. Helpful hints for reading topographic maps are provided in the

following document: http://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf

1. a) When was the Hackettstown, NJ quadrangle first produced?

__________________________________________________________

b) Has it been photorevised? If so, when?______________________

c) What are the names of the quadrangles adjacent to this map?

North__________________South__________________________

Northeast_______________Southwest_______________________

East___________________West____________________________

Southeast_______________Northwest_______________________

d) Why is this called a 7.5 minute series map?_________________

_______________________________________________________

_______________________________________________________

2. What is the contour interval of the map?___________________________________

3. a) Using the fractional scale of 1:24,000, compute how many feet on the

ground are covered by one inch on the map.

1 inch =______feet

b) Using the bar scale and a ruler, determine the distance between Pleasant

Grove and the confluence of the Musconetcong River and Hances Brook.

Distance =_________________

c) If you had a map covering the same area but at a scale of 1:62,500, howmany miles would one inch equal?

1 inch =___________________

d) If maps of each scale are printed on the same size paper, which would cover

more area? _______________________________________________

e) Which of these is of larger scale?___________________________

http://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdfhttp://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdfhttp://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf

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4. a) What is the declination of the Hackettstown quadrangle? Define declination.

_______degrees. Declination is _____________________________________

b) If you started at St. Josephs Church, what direction would you have to walk to

get to Drakestown?

____________________________

c) What physiographic barriers would you encounter on the way?

_______________________________________________________________

5. What is the approximate latitude and longitude of Springtown?

Latitude_____________________________Longitude__________________

6. Sketch the symbol used for the following features:

a) house d) railroad

b) school e) woods

c) medium duty road f) stream

7. Determine the elevation of the following points:

a) Centenary College:___________________________________

b) Schooleys Mountain Summit:__________________________

c) Confluence of the south branch of Raritan River and Electric Brook:__________

8. What is the relief on the map area?_____________________ft.

9. Determine the summit elevations of:

Fox Hill Range______________________ft.

Schooleys Mountain__________________ft.

Upper Pohatcong Mountain______________ft.

Compare these elevations and speculate on why they are so similar:

10. Estimate the width of the flood plain of the Musconetcong River in the vicinity of

Stephensburg.

__________________ft.