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GEOG 170 – Study Guide: Exam 1
Spring 2009
Each lecture is summarized below by key ideas and overall themes; also included are
questions you should be prepared to answer.
Students will need a #2 pencil and calculator for this exam.
Students
will not
be allowed to
use the calculators in their cell phones or PDA’s.
Class 1: What is a map?
•
What defines a map?
What are some characteristics of maps?
•
Recognize the two general categories of maps: Reference vs. Thematic
§
What does each emphasize?
Could you recognize examples of each?
Basics of Geospatial Data
Class 2: Size & Shape of Earth
•
Identify/Explain the 3 different models for representing the shape of the earth
§
Know relationship between #D model & size of mapped area
•
Understand the properties of spherical graticule; What is a great circle?
•
Know characteristics of latitude & longitude
•
What are geodetic coordinates?
•
What is a horizontal datum?
Vertical datum?
•
Different model of earth = Different lat/long coordinates
Class 3: Map Projection Basics
•
What are projections & what four properties of a globe are distorted when projecting to flat
surface?
•
Two things are needed to create a map…
•
Know the three basic surfaces used to construct projections
•
What is the importance of the line/point of tangency?
•
Projection surface have two main properties: Tangency and Orientation
§
What is difference between normal & transverse?
How does choice of orientation
related to mapped region?
§
What is difference between tangent and secant?
•
Know what is meant by conformal, azimuthal, equalarea (equivalent) and equidistant
projections
•
Know the properties of the Mercator projection
•
What are compromise projections?
•
Understand how we select projections – Depends on purpose of map & location of region;
What projection we would choose for Chile versus US; What projection we would choose for
navigation versus mapping geographic distributions?
Classes 45a: Coordinate Systems & Global Grids
•
Why do we need coordinate systems?
(Why don’t we just use geographic coordinates?)
•
What is a coordinate system?
•
Universal Transverse Mercator (UTM) System
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This note was uploaded on 09/14/2009 for the course GEOG 120 taught by Professor Williams during the Spring '07 term at Wisconsin.
 Spring '07
 Williams

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