# Maps Chapter 6, Section 3.

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Maps Chapter 6, Section 3

Map Projections How is a map made?
Points on a globe (3D) are transferred to paper (2D). May distort shapes and sizes. 3 types of map projections Mercator Robinson Conic

Map Projections Mercator Projection Lines of longitude are parallel.
Shapes are preserved but sizes are distorted. Areas near the poles appear largest.

Map Projections Robinson Projection Lines of latitude are parallel.
Lines of longitude are curved. Shapes are preserved but sizes are somewhat distorted.

Map Projections Conic Projection
Made by projecting points from a globe onto a cone. Useful for mapping small areas in the middle latitudes.

Topographic Maps What is a topographic map?
Shows changes in elevation. Includes both natural and cultural features.

Topographic Maps Reading Topographic Maps Contour Lines
Connect points of equal elevations. Contour Interval Change in elevation between two contour lines. Index Contours Darker contour lines marked with an elevation.

Closed loops indicate hills or depression. Hachure marks indicate depressions. Contour lines will form V’s that point upstream. Closely spaced lines indicate rapid change in elevation.

Topographic Maps Map Scale
Ratio between distance on map and distance in real life. Given as a ratio (1:80,000) or as a scaled bar.

Topographic Maps Map Legend Explains symbols used on the map.

Topographic Maps Map Series
Maps with the same dimension of latitude and longitude.

Geologic Maps What are geologic maps?
Show the arrangement and types of rock at the surface of the Earth. Cross-sections of the earth can be developed based on these maps.

Geologic Maps 3-D Maps Can be made with computers using digitizing.
Digitizing is a process by which points are plotted on a grid.

Remote Sensing What is remote sensing?
Way of collecting info about Earth from a distance. Often uses satellites.

Remote Sensing Types of remote sensing Landsat
Uses pictures of the Earth taken with different wavelengths of light.

Remote Sensing Types of remote sensing Global Positioning System
Uses 24 satellites that transmit radio signals of position and time. Receivers use this info to calculate position.

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