GIS Short Answer Questions for Final Exam
1. a) The three types of map projections are conformal(equal angle), equal area, and equidistant.
Conformal map projections try to preserve angles locally. Equal area projections try to preserve the
equal area, and equidistant projections try to preserve distance from some standard point or line.
b) The four elements a map projection has to preserve are shape, area, distance, and direction.
c) The UTM coordinate system uses a 2D coordinate system to give locations on the Earth's surface. It is
a horizontal position representation, it is used to identify locations on the Earth independently of
vertical position, and it differs from latitude and longitude. It divides Earth into 60 zones, based on
For #2, see below. Src: msdn.microsoft.com/en-us/library/bb259689.aspx
Ground Resolution and Map Scale
In addition to the projection, the ground resolution or map scale must be specified in order to
render a map. At the lowest level of detail (Level 1), the map is 512 x 512 pixels. At each
successive level of detail, the map width and height grow by a factor of 2: Level 2 is 1024 x
1024 pixels, Level 3 is 2048 x 2048 pixels, Level 4 is 4096 x 4096 pixels, and so on. In general,
the width and height of the map (in pixels) can be calc