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Topographic Maps

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julissa hernandez

on 24 April 2015

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Transcript of Topographic Maps

TEK : 8.9C
Topographic Maps are maps that show physical and man-made features using contour lines
Erosion also plays a big part because surface soil and rocks are carried away by water and winds creating different types on landscapes Ex: ice erosion, coastal erosion, etc.
Topographic maps, also called contour maps or topo maps, also show elevations and landforms
Contour Interval- Difference between the elevation of one contour line and the other
Topographic Maps- map that shows surface of features
Topography- Shape of land
Elavation-Height above the earth
Topographic Maps
Alma Lerma
Julissa Hernandez
Samantha Mendoza
Irving Leal

Key Points
A topographic map is just a two-dimensional representation of a portion of the three-dimensional surface of the earth.
It contains contour lines, horizontal distances, vertical elevations and etc to represent both natural and man-made features of the ground
Contour lines trend up valleys and form a "V" or a "U" where they cross a stream
Closely spaced contour lines represent steep slopes, conversely, contour lines that are spaced far apart represent gentle slopes
simple representation
complex representation
A map scale and legend are usually included with a topographic map to better help the reader understand it
Topographic maps
Mean sea level- point between the highest and the lowest tide level
Contour Line- line on a topographic map connecting with equal (same) elevation
Index Contours- Every 5th line of a topographic map that is printed bolder for reference
Depression contour- Straight line drawn along the inside of the loop pointing towards its center indicates a depression.


Hydrosphere-Earths oceans, lakes, and rivers (body of waters)
Lithosphere-A solid,rocky, outer layer of earth
~Topographic maps show natural & man-made features.
~ This contains "contour lines". They are the foundation of the topographic map.
~The contour interval with hatch marks represent "Depressions."

~ Depressions in a Topo-Map is an area of low land. (EX... sinkhole)
~ A topographic map will provide a contour interval which means the vertical difference of two lines joined together.
~ Intervals can be steep.
~Topographic Maps are a very accurate representation
of features that appear on Earth's surface.
~ These features include roads, buildings, urban development, railways, airports, names of places and geographic features, administrative boundaries, state and international borders, reserves.
~ Topography, shows a variety of elevations and landforms.
~ Topography helps us when we are either going on a hike, or for mining.

~ It helps to know the different elevations there is for us to be aware.
~Topographic maps are based on topographical surveys. Performed at large scales, these surveys are called topographical in the old sense of topography, showing a variety of elevations and landforms. This is in contrast to older cadastral surveys, which primarily show property and governmental boundaries.
Landform Regions: include Plateaus, mountains, valleys, plains, etc.
Hachure Line: show orientation of slope and provide a sense of its steepness.
V-shape contour line - stream in the valley flows toward the open.
Biosphere: the regions of the surface occupied by living organisms.
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