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GEOG 319/658 &nbs= p; &= nbsp; &nbs= p; Exercise #3 &= nbsp; &nbs= p; = FALL 2014
Map Scale, Map Project= ions, Data Classification, and Linear Simplification
Due: Monday, September= 22
A. Map Scale
1. One map has a representative fraction= (RF) of 1:1,000,000, and another map has a RF of 1:100,000. Which map is c= onsidered to be the larger scale map? Why? (5 points)
2. Two points are separated by 4.32 inch= es on a1:20,000 scale map. What is the distance between these two points in= miles on the Earth? (5 points)
3. Which of the following approaches for= depicting scale is appropriate for maps shown on the Internet: RF, verbal = scale, or bar scale? Why? (5 points)
4. Compute a RF for the Google scale sho= wn in question 6 on p. 132 of the Peterson textbook. (5 points)
B. Map Projections
1. List three arguments why the Mercator= projection serves as the basis of map projection for online map service pr= oviders. (5 points)
2. Would it be appropriate to use the Me= rcator projection for an online dot map depicting the distribution of wheat= produced throughout North America? Explain your response. (5 points)
3. Define conformal and equal-area map p= rojections, indicate when each should be used, and give an example of each.= (5 points)
C. Data Classification=
The following data are the percent Hispa= nic (or Latino) for counties in Arizona (based on 2012 U.S. Census data).= span>
Apache 6.2
Cochise 33.1
Coconino 13.7
Gila = 18.4
Graham 31.3
Greenlee 47.3
La Paz &nbs= p; = 24.7
Maricopa 30.0
Mohave <= span style=3D"width:5.79pt; display:inline-block"> 15.4
Navajo &nbs= p; 10.9
Pima = 35.4=
Pinal 29.0
Santa Cruz 82.7
Yavapai 13.9
Yuma 60.5
Classify the above data using each of th= e following data classification methods: equal interval, quantiles, and max= imum breaks. Remember that you will need to sort the data from low to high = prior to determining the classes. You must show all work at each step= . (20 points)<= /p>
&nbs= p;
D. L= inear Simplification
1. Download the shapefile for countries = of the world from the following site (use the option Download Countri= es ): http://www.nat= uralearthdata.com/downloads/10m-cultural-vectors/10m-admin-0-countries/ ).
2. Open www.MapShaper.org= , which is a fre= e online utility for performing linear simplification.
3. Under =E2=80=9CSimplification method,= =E2=80=9D select the Douglas-Peucker method. Under =E2=80=9COther options,=E2=80=9D turn o= ff =E2=80=9Crepair intersections.=E2=80=9D
4. Click the select button and specify the shapefile = span> (only the .shp file) = span> for the countries that = you downloaded in step 1. You can also dra= g-and-drop the shapefile in the online utility.
5. Using the =E2=80=9CSimplify=E2=80=9D = scroll bar, experiment with changing the number of points retained. =
6. How far do you feel you can reduce th= e number of points and still retain the basic look of countries in the worl= d at the scale depicted on the map? Explain your response. Capture the scre= en showing your desired level of simplification and submit it along with yo= ur written response to this question. (10 points)