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Chapter 2

GIS-3015 Chapter Notes - Chapter 2: United States Geological Survey, Lambert Conformal Conic Projection, Map Projection
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4 Pages
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Fall 2018

Department
Geography
Course Code
GIS-3015
Professor
Mahjoor
Chapter
2

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Assignment 02
Useful material for answering Q1 and Q2
Key distance conversions:
Conversions between different units of measurement are also an important part of scale and
distance calculations.
Key conversions are listed below:
1 inch = 2.54 centimeters
1 statute mile = 5,280 feet = 63,360 inches
1 statute mile = 1.609 kilometers
1 kilometer = 100,000 centimeters
1 nautical mile = 6,076.1 feet
1 foot = 12 inches
1 meter = 100 centimeters
Explanation of representative fraction
Map scale is defined as the mathematical relationship between a unit of distance on the map
and its corresponding distance on the ground. The ratio of map distance to ground distance, both
in the same units of measurement, is called the representative fraction (RF) for the map. It is
computed from the following equation:
1/X = map distance (md) / ground distance (gd)
We will use this equation in the following scale problems. Hence, an RF of 1/24,000
means that 1 centimeter on the map represents 24,000 centimeters on the ground, 1 inch on the
map represents 24,000 inches on the ground, and so on for other units of distance measurement.
The RF can also be written as 1:24,000.

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Description
Assignment 02 Useful material for answering Q1 and Q2 Key distance conversions: Conversions between different units of measurement are also an important part of scale and distance calculations. Key conversions are listed below: 1 inch = 2.54 centimeters 1 statute mile = 5,280 feet = 63,360 inches 1 statute mile = 1.609 kilometers 1 kilometer = 100,000 centimeters 1 nautical mile = 6,076.1 feet 1 foot = 12 inches 1 meter = 100 centimeters Explanation of representative fraction Map scale is defined as the mathematical relationship between a unit of distance on the map and its corresponding distance on the ground. The ratio of map distance to ground distance, both in the same units of measurement, is called the representative fraction (RF) for the map. It is computed from the following equation: 1/X = map distance (md) / ground distance (gd) We will use this equation in the following scale problems. Hence, an RF of 1/24,000 means that 1 centimeter on the map represents 24,000 centimeters on the ground, 1 inch on the map represents 24,000 inches on the ground, and so on for other units of distance measurement. The RF can also be written as 1:24,000.
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