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Map Interpretation & Analysis

by: Dr. Caesar Anderson

Map Interpretation & Analysis GEOG 380

Dr. Caesar Anderson

GPA 3.91

James Woods

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James Woods
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This 3 page Class Notes was uploaded by Dr. Caesar Anderson on Monday October 5, 2015. The Class Notes belongs to GEOG 380 at California State University - Long Beach taught by James Woods in Fall. Since its upload, it has received 53 views. For similar materials see /class/218766/geog-380-california-state-university-long-beach in Geography at California State University - Long Beach.

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Date Created: 10/05/15
Geog 380 Jim Woods MAP SCALE Geographical maps are drawn smaller than the reality they represent How much smaller is expressed by the scale of the map Map scale simply means the size of a feature on the map compared to the size of the same feature on the earth There are three basic ways in which we can express map scale 1 Verbal 2 Lineargraphicbar 3 Representative Fraction First of these is the verbal scale in which we merely state the relationship in words such as one inch represents one mile It is easy to see that this means that a feature one inch long on the map would be one mile long in reality Note that units feet inches miles etc are given for this scale The second form of map scale is the linear scale which is also called a graphic or bar scale This consists of a line marked off in units and is the scale of the map If one inch represents ten miles on the map a one inch segment of the scale would represent ten miles The third is representative fraction This scale is unit less and is expressed as a fraction or ratio ll000000 or ll000000 The numerator of the fraction which is always 1 represents the real world measurement of an object or feature on the map and the denominator represents the size of that feature on the ground in the same units In other words Map SizeActual Size Representative Fraction Thus 1 1000000 means that the map is onemillionth of reality one inch on the map represents 1000000 inches in the real world or three inches on the map represents three million inches on the ground The same holds true for centimeters and millimeters Conversion between format RF to Verbal l250000 equals how many miles per inch 1 250000 1 250000 1 250000 1 mile Divide Denominator by mile 1 mile 5280 feet 5280 l2 63360 Convert a mile in feet to a mile in inches 1 250000 63360 mile Divide Denominator by mile in inches 1 39457 miles 1 4 miles approx Verbal to RF One inch represents 25 miles 1 25 miles 1 25 miles X 1 mile Multiply units by miles 1 mile 5280 feet 5280 12 63360 Convert a mile in feet to a mile in inches 1 25 miles X 63360 mile 1 25 X 63360 1 1584000 RF is 1 1584000 Five inch represents 25 miles 5 25 miles 5 5 25 5 First reduce the values to 1 1 5 miles 1 5 miles X 1 mile Multiply units by miles 1 mile 5280 feet 5280 12 63360 Convert a mile in feet to a mile in inches 1 5 miles X 63360 mile 1 5 X 63360 1 316800 RF is 1 316800 Large vs Small scale The terms largescale and smallscale are encountered frequently in map work These tend to be relative terms The larger the scale the closer the map comes to being the same size as the earth the smaller the scale the greater the difference between the size of the feature on the map as compared to its size on the earth The closer the representative fraction comes to being 11 in other words the smaller the denominator of the RF the larger the scale of the map Largescale maps show small areas in great detail while smallscale maps show large areas in a very generalized form On page of Goode s World Atlas th edition there are four maps all centered on Washington DC Under each on are eXamples of all three scale forms verbal graphical and representative fraction Notice how the amount of detail in each map varies with the scale of the map RF Scale Detail Generalization 1 24000 large great little 1 50000 1 62500 1 63360 1 100000 1 125000 1 150000 1 200000 1 250000 1 500000 small little very Construct a graphic scale Town A is 23 miles from Town B The measured distance is 4 inches How many miles per inch are there What is the Representative Fraction Construct a graphic scale divided into 4 units of 5 miles each Draw a line 4 inches long Label the ends A and B Using your ruler start at point A and draw a line 5 3A long at an angle above your line Label the end point Z Mark on the line every 1A Label each mark 1 2 3 4 5 6 23 point 23 and Z are the same Place your triangles at right angles with the edge of one connecting Z to B Slide your ruler along Every time one edge touches a label put a mark on line AB Repeat till line AB is marked into 23 sections Each section now represents 1 mile If you only wanted to show every 5 miles mark every 5Lh tick mark


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