Geologly_Lab3
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University of Colorado, Denver *
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Course
1011
Subject
Geography
Date
Dec 6, 2023
Type
docx
Pages
3
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Geography 1011
Exercise 1
Topographic Maps
Materials:
(1) Topographic Maps Handout; (2)
Eldora HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717"d HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717"o Springs HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717" HYPERLINK
"https://store.usgs.gov/product/487717", CO TNM Geospatial PDF
(download for free;
requires
Adobe Acrobat Reader DC
to run), (3) See Exercise 1 Lecture on Canvas.
Part 1.
Map Grids and Elevation.
Use the Eldorado Springs GEO PDF map along with
the topographic map handout (p. 1-10) to answer these questions.
•
•
What is the Representative Fraction (RF) scale of this map?
1: 24 000
•
What is the contour interval?
40 f
•
What is the interval between
index
contours?
200 f
•
What is the magnetic declination of 8 degrees?
•
What is the name of the
Adjoining Quadrangle
located immediately south of this
map? (see the small index map along the bottom the map)
Eldorado Springs, CO
•
What are the latitude and longitude of the
southwest
corner of the map?
Latitude: 39.8750
Longitude: -105.3750
Northeast
corner?
Latitude:-105.2500
Longitude: 40.000
•
How many minutes of latitude and longitude does this map cover?
7.5 minutes
•
Select the “Layers” icon along the lef side toolbar. Open the “Map Frame” folder.
Check the “PLSS” box. This will activate the grid lines that depict the U.S. Land Office
and Survey system (see Handout pg. 2-3 and figure 1.3).
Give the Township and Range coordinates to the nearest 160-acre section (i.e., to the
nearest
¼ section) for each of the following map features:
•
The summit of Castle Rock, east of Gross Reservoir portion of the map.
Township:21, Range: 22
•
Eldorado Springs Cemetery near the town of Eldorado Springs along the
eastern border of the map.
Township:25, Range: 20
Part 2.
Scale Problems and Distance Measurement.
•
Given three maps with these RF scales, which map would show the least amount of
detail?
Circle your choice.
a. 1:24,000
b.
1:62,500
c.
1:125,000
d. 1:1,000,000
Select “Tools” on the Adobe toolbar.
•
Select the “Measure” on the right-side toolbar. Then select the “Geospatial Location”
tool at the top of the map and use it to find the grid coordinates for the following
locations (note that this tool may also be useful in answering question #3 if you were
having problems figuring that out):
•
Castle Rock:
Lat: 39.94
Long:-105.34
•
Eldorado Springs Cemetery:
Lat: 39.93
Long: -105.27
•
Select the “Measuring Tool” and use it to determine the straight-line distance from
the top of Green Mtn. (in the northeast quarter of the map) south to the top of
South Boulder Peak.
•
Distance:
2.08
mi
•
Use the Area Measurement Tool to determine the area of Section 18, T1S, R70W.
•
Area:
0.294
sq. mi
Part 3.
Contours.
•
Locate Bear Peak, in the northeastern quarter of the map.
Which side of Bear Peak
is steeper, the east or the west?
How can you tell?
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