GI and Cartography Issues - A Primer of GIS: Fundamental Geographic and Cartographic Concepts - page 65

GIS organization as an arrangement of hardware, software, and peripherals.
6. What are the four main choices in creating GI?
7. What are the three components of color?
8. What is the most common type of projection used in surveying?
9. What projection properties does a Mercator projection preserve?
10. What is the difference between large and small scale?
Answers
1. What GIS component is frequently overlooked in descriptions of
GIS?
People are often overlooked.
2. What is the difference between a spheroid and an ellipsoid ?
A spheroid is perfectly round, an ellipsoid is oblate.
3. How is a geoid used in relationship to an ellipsoid?
An ellipsoid can be “fitted” to a geoid.
4. How is scale helpful for working with GI?
Scale helps in understanding the abstractions between collection units and
mapping units, as well as in understanding characteristics of the GI repre-
sentation.
5. Why would some people claim all maps lie?
All maps and GI must abstract from the actual things and events in the
world, thus creating distortions.
6. What are the four main choices in creating GI?
The four main choices are projection, scale, data, and symbols.