Geographic Information System

MIDTERM EXAM

 

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ESSAY QUESTIONS (20 points)

 

  1. What is the definition of Geographic Information System? How is it used in public health?

 

 

ESSAY QUESTIONS (20 points)

 

  1. Define the following and give an example of each.
  • Geodetic
  • Photogrammetric
  • Digital Image Processing

 

 

ESSAY (20 points)

 

  1. Discuss the different types of maps that could be used in public health? What are points?  What are polygons?  How are they useful?

 

Points represent discrete locations on the ground. Either these are true points, such as the point marked by a USGS brass cap, such as a section corner, or they may be virtual points, based on the scale of representation. For example, a city’s location on a driving map of the United States is represented by a point, even though in reality a city has area. As the map’s scale increases, the city will soon appear as a polygon. Beyond a certain scale of zoom (i.e., when the map’s extent is completely within the city), there will be no representation of the city at all; it will simply be the background of the map.

 

 

 

ESSAY (20 points)

 

  1. What are scales and how are they used? What is the importance of longitude and latitude coordinates?

 

Scale is the relationship that the depicted feature on map has to its actual size in the real word. Tells the user how much smaller the map is than the reality it represents

 

ESSAY (20 points)

 

  1. Define clusters. Explain how mapping is useful to locate them.

 

 

 

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