# Unit 2 Contour Mapping - PowerPoint PPT Presentation

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## Unit 2 Contour Mapping

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### Road map, weather map, trail map, subway map, political map, ... Mercator Projection. Straight longitude and latitude lines that intersect at right angles. ... – PowerPoint PPT presentation

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Title: Unit 2 Contour Mapping

1
Unit 2 Contour Mapping
2
• What kind of maps do you know?
• Road map, weather map, trail map, subway map,
political map, topographic map, building maps

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4
• What words are associated with maps?
• Latitude, Longitude, Key/Legend, Grid, Mileage
scale

5
• What is the biggest problem in making a map of
the world on a piece of paper?
• Earth is round paper is not

6
• Who makes maps?
• Cartographers

7
Mapping Information
• North is usually at the top of the map
• Location descriptions
• Relative NJ is east of PA
• Absolute grid coordinates latitude/longitude

8
• Equator imaginary line that circles the Earth
in between North and South poles runs East to
West
• Prime Meridian imaginary line through the old
Royal Astronomical Observatory in Greenwich,
England runs North to South

9
• Latitude distance in degrees North or South of
the Equator also known as parallels
• Longitude distance in degrees East or West of
the Prime Meridian also known as meridians

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• Time Zones are determined by the meridians or
longitude lines on a map
• Every 15 from the prime meridian in Greenwich,
England 24 time zones
• If you travel West of England, you subtract an
hour traveling East, you add an hour

12
Time zones
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14
Map Projections
• Map projection is made when points and lines on a
globes surface are transferred onto paper
• Different projections create different
distortions depending on purpose

15
Mercator Projection
• Straight longitude and latitude lines that
intersect at right angles.
• Scale is true at the equator or at two standard
latitude lines of equal distances from the
equator.
• Areas near poles are distorted.

16
Robinson Projection
• Latitude lines are parallel, but longitude lines
curve into poles.
• Some distortion of area, shape
• Used to show visually appealing pictures of the
whole world

17
Conic Projection
• Lines of latitude and longitude intersect at
right angles
• Meridians are straight and parallels are arcs
• Accurate for small areas road maps, weather maps

18
Mileage Scale
• Map scale is the relationship between the
distances on the map and actual distances on
Earths surface.
• Bar scale -
• Verbal scale one inch 100 miles
• Ratio scale 1100

19
• "On this map there's a bar scale! All you have to
do is take a piece of paper, mark off miles from
the bar scale onto the edge of the paper, and
then hold the edge of the paper so that it lies
along Bo Ring Way

20
• One inch four miles. First, place a ruler
marked in inches on the map and measure how many
inches separate the two towns on the map! The two
towns are about 2.5 inches apart!
• 2.5 inches times 4 miles per inch 10 miles
apart on the ground!"

21
• "That's more difficult because the road is
curved! You need some way to estimate distance
along the curves of Dingle Way from Louberg to
Luluville. you can use a piece of string! Take
the string and lay it out along the route. Then,
straighten the string out and hold it against the
bar scale or a ruler!

22
Driving Distances
23
Topographic maps
• Topo means shape
• Topographic maps show the shape and height of the
land on a flat piece of paper
• Elevation is the distance of a location above or
below sea level

24
• Contour lines connect points on the map that have
the same elevation
• Index contours are contour lines with elevation
numbers

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26
High Point High School
27
Contour Mapping Rules
• 1. Hills and depressions are represented by
circles. Hachure Lines are used to show
depressions.
• Hill Depression

28
Contour Mapping Rules
• 2. Contour lines never cross.

29
Contour Mapping Rules
• 3. When contour lines meet a river or a stream
they form a V the points upstream.

30
Map Symbols
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34
Mapping Quiz Topics
• Equator and Prime Meridian
• Latitude vs Longitude
• Three map projections
• What is a topographic map?
• Topographic Terms
• Topographic Rules (3)
• Map symbols

35
Mapping Activity 2
36
Mapping Activity 2
37
Mapping Activity 3
38
Mapping Activity 3
39
The Average Slope
• Slope the amount of deviation from the
horizontal
• Ex hillside skiing

Bunny hill
Intermediate
Professional
40
In math class, you learn slope as
• Slope rise
• run
• Slope y2 y1
• x2 x1

41
• Slope y2 y1
• x2 x1
• 3 0
• 6 0
• 0.5

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Websites
• http//nationalatlas.gov/articles/mapping/a_latlon
g.html
• http//plasma.nationalgeographic.com/mapmachine/
• http//www.nationalgeographic.com/xpeditions/lesso
ns/01/g68/mapmaking.html
• http//members.shaw.ca/hollylloyd/theme/mappingski
lls.htm
• http//interactive2.usgs.gov/learningweb/teachers/
exploremaps.htm