Topographic Map Skills
description
Transcript of Topographic Map Skills
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WHAT OTHER TYPES OF INFORMATION (BESIDES LOCATION) CAN MAPS SHOW?
Topographic Map Skills
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Catalyst1. Jelly Bean Video
Reflection: What would you do differently?
2. What method do we use to answer questions in science?
3. THINK: What types of information do we get from maps?
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Sneak Peek: Unit 1: Geology: Were the continents always in their current positions?
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FINISH: WORLD MAPS• Be able to locate the 7 continents!
• The 5 major oceans!• Which ocean is LARGEST?
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Latitude and LongitudeLatitude
Influences climate Latitude = our
altitude to Polaris (the North Star)
Longitude Same longitude
experiences the same time (time zones)
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TIME ZONES
What is a time zone?
Thought Question: Why do time zones exist?
Does the sun RISE and FALL at the same time in all places in the world?
Even today (and especially in ancient times, people measured noon by the position of the Sun directly overhead!)
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Earth rotates on its axis at 15°/hourThe Earth has a total of 360°, 24 time zones
as a result of our rotation
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UNITED STATES TIME ZONES
What are the 4 major US time zones?• Eastern• Central• Mountain• Pacific
Which one do we live in?
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WEATHER MAPS: ISOTHERMSIsotherm: lines that connect areas
of equal temperaturesIso = equalTherm = temperature (or heat)
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Vocabulary for Success
IsoIsothermContour linesElevationSea levelContour indexContour interval
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Isolines
Lines that connect areas of equal value on a map Iso = equal Ex) isotherm map
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Topographic Maps
Globes, projections, & geological maps do not show all the features of the land like rivers, hills, and constructed features.
Topographic maps can show us characteristics of the land Contour lines on the map show elevation!
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Contour Lines
Contour line is a specific type of iso-line Lines that connect points of equal elevation on a map
Elevation = height above sea levelSea level = average height of all Earth’s
oceans
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Topographic MapWhat do you notice about this map?
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Decoding the Map
Map Scale = ratio between distances on a map and actual distances on the surface of Earth (ex. 1: 24,000) If there were buildings on this map, how big would
they be in real life? Map Legend = explains what the symbols
represent on the map
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Contour Interval
Contour interval – distance between contour lines on a map
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Contour Index
Reference contour line whose elevation is labeled Think: Index finger
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Fast Facts
1. Closer lines = steeper slope
2. Depression = hole 3. Highest elevation of a
hill Find the highest/latest
contour line Highest possible elevation is
just below that of the next line
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Let’s Practice: The Flag RaceContour Interval = 100 feet
At what elevation did I leave my glasses?
100 Feet
500 feet
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The Flag Race Map
100 feet
500 feet
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The Flag RaceContour Interval = 100 feet
100 Feet
500 feetWhich side of the mountain would you chose to climb up?Why?
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SLOPESTEEP Less steep
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The Flag RaceContour Interval = 100 feet
100 Feet
500 feetWhich side is less steep?
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The Flag Race Map
100 feet
500 feet
Which side is less steep on the map? How can we tell? What does “steepness” look like on the map?
Let’s give these lines a name….
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So what ARE those Squiggley lines on the
map?
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We call those lines…Contour line = connects points of equal
elevation
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The Flag Race
What is the elevation of your forgotten
sunglasses? How do you know? We call the spaces between each
line, the contour interval. Write your
own definition of what “contour interval”
means.
100 Feet
500 feet
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The contour interval is 10…
200
240
*What is the elevation of the church?
*What is the elevation of the school?
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The contour interval is 50…
100 ft300ft
*What is the elevation of the church?
*What is the elevation of the school?
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BONUS: The contour interval is 100. The x represents the elevation of the peak. What is
the highest possible elevation of the peak?
x100
500
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What if we have to figure the contour interval out on our
own?
Steps to calculate contour interval Subtract the elevations of two index contour
lines Count the number of spaces between two index
contour lines Divide the difference in elevation by the number
of spaces between two index contour lines
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Calculate Contour IntervalStep 1: 800 – 700 =
100Step 2: Count spaces:
5Step 3: 100/5 = 20
Contour interval = 20!
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Calculate Contour Intervalon this map
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PARTNER WORK
1. With the person sitting beside you:-Construct a landform out of Play-Doh.-It should include several different elevations.2. Draw a contour map of your landform.3. Raise your hand – when checked off:
FIND ANOTHER GROUP TO TRADE WITH! Try to construct their landform!
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Find a line across a contour mapUse a piece of paper to mark off where the
contour lines cross the line.Use the paper as the x-axis of a graph with the y-
axis equal to the contour intervalPlot the points and connect them with a smooth
line.A profile shows the side view of a contour map.