Using Map Scales CHAPTER 4 SCALE Shows the

Using Map Scales CHAPTER 4

SCALE �Shows the relationship between the distance on a map and the actual distance on the earth’s surface �Direct statement �Line scale �Representative fraction

Direct Statement �Also called a verbal statement because it uses words to describe the relationship � 1 cm to 10 km � 1 cm on map represents 10 km on land

�Complete pg 44 Fig 4. 2

Line Scale �Is like a special kind of ruler that is divided into units of distance �Complete pg 44 Fig 4. 3

Representative Fraction (R. F. ) �Is a ratio and is show as follows: 1: 50 000 �This means that 1 unit on the map represents the same units on the earth’s surface � 1: 50 000 �The first term of the ratio Is always 1 Represents the distance on the map Represents the same unit of measurement as the second term of the ratio

� 1: 50 000 �The second term of the ratio Represents the distance on the earth’s surface Represents the same unit of measurement as the first term of the ratio �Therefore, if the R. F. is 1: 50 000, then 1 cm on the map represents 50 000 cm on the earth’s surface

�We usually want to know distance in kilometres �To change the cm used in the R. F. into km Remember � km 1000 hm dm cm mm 100 10 1 . 01 . 001

�Complete page 47 �#1 -4, 6, 7, 8, 11, 12