Topographic Maps

1
Topographic Maps

• EQ How are elevation, relief and slope shown on
  a topographic map?

2
Topographic Map

• Shows the surface features of an area as if you
  were looking DOWN on it.
• Provides accurate information on elevation,
  relief and slope.
• Why do we use topographic maps?

EQ How are elevation, relief and slope shown on
a topographic map?
3
Scale
EQ How are elevation, relief and slope shown on
a topographic map?

• Large scale maps that shows a close-up view of
  part of Earths surface
• Scale1 cm 0.24 kilometers
• Shows details of elevation
• Large buildings, airports and major highways
  appear the correct size
• Google maps

4
Coverage

• The USGS,or US Geological Survey, produces the
  topographical maps for the US.
• They have made 57,000 maps at scales of either
  124,000 (1 inch 2,000 ft.)
• The maps cover an area of 145 square kilometers.

EQ How are elevation, relief and slope shown on
a topographic map?
5
Symbols

• Mapmakers use a variety of symbols to represent
  buildings, churches, railroad tracks, water, etc.

EQ How are elevation, relief and slope shown on
a topographic map?
6
Showing Relief on a Topographic Map
EQ How are elevation, relief and slope shown on
a topographic map?

• Contour lines represent elevation, relief, and
  slope.
• Contour interval change in elevation from
  contour line to contour line. Stays the same on
  a given map.

http//adventure.howstuffworks.com/outdoor-activit
ies/hiking/how-to-read-a-topographic-map2.htm
7
Topographic maps show the shape of the land.
Contour lines show elevation, slope, and relief.
Closed circles represent hilltops.
Contour lines show steepness of slope.
Index contour lines show elevation.
Contour lines never cross.
SECTION OUTLINE
8
Global Positioning SystemGPS

• A network of 24 satellites that find the
  latitude, longitude and elevation of points on
  Earths surface.

EQ How are elevation, relief and slope shown on
a topographic map?
9
Class Work and Homework

• Fill In
• What did I learn
• Confused
• Say
• Read pages G29 G33, questions 1-5. Answer with
  complete sentences ?

EQ How are elevation, relief and slope shown on
a topographic map?