Topographic Maps Part 1 v2023.docx

Topographic Maps Part 1: Coordinates, Directions and Contour Lines Resources for this Lab Worksheet Lab Book: Laboratory 9 “Topographic Maps”; map content in Laboratory 1 “Filling Your Geoscience Toolbox” PowerPoints posted in D2L: “Map Coordinate Systems”; “Topographic Maps” *For examples of how to determine coordinates like the MLO and Grand Prismatic Spring maps in this exercise, see pgs 7-9 in Lab book, and the “Coordinate Techniques” presentation posted in Collaboration>Discussions on D2L Video Links You Might Find Helpful: What is Topography? https://www.youtube.com/watch?v=K-UXrpAjyl0 Map Scale calculations https://www.youtube.com/watch?v=sgxwk6M-WiE Canadian map distance measurement using paper edge https://www.youtube.com/watch?v=ZEWH58yMsAQ U.S. Army training video measuring distance on map https://www.youtube.com/watch?v=Mq5LxCpwagc Using a ruler to measure distance on a map https://www.youtube.com/watch?v=KNyb7dha5O0 Latitude and Longitude https://www.youtube.com/watch?v=pAZUrlKk6CE Simple Lat/Long on a map https://www.youtube.com/watch?v=Kconh7p58gI Determining UTM coordinates measuring in Adobe Acrobat https://www.youtube.com/watch?v=fKln5a5BYJ0 How to Use a Protractor https://www.youtube.com/watch?v=LPc0imoebzI Measuring Azimuth with a Protractor https://www.youtube.com/watch?v=QRZOdbChiBQ Azimuth Bearings Explained https://www.youtube.com/watch?v=-mVmqf06stg REI contour lines video https://www.youtube.com/watch?v=CoVcRxza8nI Determining Point Elevations on a Contour Map https://www.youtube.com/watch?v=ySDl81dCb68 Drawing contour lines https://www.youtube.com/watch?v=SMuGzHMFuyE Topographic Profiles https://www.youtube.com/watch?v=rJru71-b61Y Topographic Profile and Topographic Gradient https://www.youtube.com/watch?v=BuWSnRheFto Topo Profile: True Profile vs Vertical Exaggeration https://www.youtube.com/watch?v=MU4EHSueSiI

A. Map Scales Use conversion table on page xvi in the lab book to convert the distances 1. Standard United States Geological Survey (USGS) 7.5 minute topographic quadrangle maps have a map scale of 1:24,000. If you measure a length of 12 inches on the map with a ruler, what is that distance on the ground in the following units (show work): Miles: Kilometers: 2. Standard USGS 30x60 minute topographic quadrangle maps have a map scale of 1:100,000. If you measure a length of 6 centimeters on the map with a ruler, what is that distance on the ground in the following units (show work): Miles: Kilometers:

B. Texas map: measuring map distances Use the bar scale on the map to measure distances on the map: Straight line distance in miles on map from Austin to San Antonio: Straight line distance in miles on map from Houston to El Paso: Straight line distance in miles on map from Amarillo to Lubbock:

C. Azimuth Directions Use a protractor to determine the compass directions of the headings going from the center of the compass to each letter (A-F) in azimuth . For explanations of azimuth, see Fig 2.4 p35, Fig 9.5 p239 in lab book or PowerPoint presentation “Topographic Maps” slides 19-22 A B C D E F

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