GIS Short Answer Questions for Final Exam.docx

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Earth, Space Science and Engineering
ESSE 3600

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 longitude. For #2, see below. Src: 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
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