GEOL 1301 - Lab 01 - Topographic Maps
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University of Texas, Arlington *
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1301
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Geology
Date
Feb 20, 2024
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GEOL 1301 Name: Jonathan Venegas
Topography Lab
a
Learning and Lab objectives: For this lab we will focus on the topographical maps.
These are maps that contour elevation data and delineate the mountains and valleys
that occur over the surface of the Earth.
For a better idea of what this would look like from a birds eye view, there are two
maps at the back of the classroom where the topography in these areas is mimicked
by the plastic molds. Note that a single topographical contour will follow the same
elevation along the side of the hills and valleys, and that the steeper the hill, the
closer the contours are to each other.
Lab instructions:
The laminated topographic maps used for this activity cover a
portion of the field trip area in Oklahoma. Complete the short-answer questions for
Part 1 of this lab and then construct a profile along points A to B on the map for Part
2. Your instructor will go over the workflow for Part 2 at the beginning of class so
please pay close attention. Don’t forget to put your name on the worksheets!
Supplies needed for this lab: Ruler, simple calculator, piece of white paper, pencil,
and eraser
Terms and Concepts: Please review the following terminology in the online
resources presented below:
Topography (also addressed on Pg.6 of your textbook)
Longitude and latitude (subdivisions in degrees, minutes, seconds)
UTM coordinates
True north versus magnetic north, magnetic declination
Contour lines and contour interval
Map scale
Topographic profile
Online Resources:
https://en.wikipedia.org/wiki/Topographic_map
http://en.wikipedia.org/wiki/Geographic_coordinate_system
http://serc.carleton.edu/mathyouneed/slope/index.html
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Part 1: General Aspects of Topographic Maps
1. What is the name of the quadrangle?
Springer
2. What is the latitude along the North border of the map?
97°7°30°
3. What is the longitude along the East border of the map (in the northeast corner)?
34°14°00
4. What is the magnetic declination in the area covered by the map?
2° East
5. What is the contour interval on the map?
0.2 miles and 0.2 Kilometers
6. The street running approximately north-south in the eastern half of the map (marked with two parallel lines) is Interstate-35. What is the latitude and longitude at
the place where I-35 crosses the boundary between Carter County and Murray County (to the nearest degree and half minute)?
Latitude: 97°8°30
Longitude: 34°22°30°
7. What is the elevation of this location?
1250
8. What is the ratio scale of the map?
1.24000
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9. Use the scale bar on the map to determine the distance between points A and B marked on the map (in kilometers and miles). Show your work.
2.7 miles
4.3 kilometers
Work on topographic map
Extra credit question:
What is the vertical exaggeration of your topographic profile (see next page - the profile is part of the regular lab, not extra credit)? Show your calculation.
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Part 2: Construct a Topographic Profile
Using the graph paper provided to you by your instructor, construct a topographic
profile between points A and B (i.e., A-B profile line) following the dashed N-S line
on the map with the following steps:
Draw a horizontal line
near the bottom of your paper that is the same
distance as the distance between points A and B. You will need space under
the line to write. Mark both points A and B at either end of the line. This is the
horizontal axis
of your graph.
Now let’s draw your vertical axes
:
o
Your horizontal axes should start at a value of 800 ft and end a value
that is around 100 feet above the highest elevation along A-B profile
line on the laminate map.
o
Each square on your graph paper should equal a vertical increment of
10 ft. Determine how long your vertical axes need to be by considering
how much elevation changes from the A to the B on the laminate map.
o
Draw vertical lines above both the A and the B ends of your horizontal
axis.
o
Label the left-hand axis as “Elevation” and put marks at 50ft
increments so you can easily find your place.
Once you have your graph set up, you can begin to draw on your
topography
. There are several ways to do this, however this is a simple one
to begin on: o
Fold your graph paper along the horizontal axis you drew. o
Place the folded edge of your graph paper along the A-B line on the
laminated map. Make sure that the A on the graph paper and the A on
the laminated map are in the same location.
o
Make a small tick mark below your horizontal axis at each point a
topographical contour line touches the folded edge of your graph
paper. Neatly label each of these marks with their elevation below
your horizontal axis.
o
Unfold the paper and flatten it out. Make a little dot at the correct
elevation immediately above each tick mark you made along your
horizontal axis. Note that this dot must be directly above the tick mark
along your horizontal axis; they should not cluster at one end of it.
o
Once you have all your dots marked along entire profile line, connect
them with a smooth curve.
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