World Map Lesson 4 - The Global Grid System - Grade 6+
|Activity Goal||To use the global grid system of latitude and longitude to find specific locations on a world map.|
|Materials Needed:||A pencil, a ruler, and a Cram World map.|
|The global grid system uses both the parallels of latitude
and the meridian of longitude. When giving a location in latitude and
longitude, latitude is always first. As an example, the location for New
Orleans is 30 N, 90 W. This is read as 30 degrees north latitude, and 90
degrees west longitude.
Timbuktu is a city in the country of Mali and was a major trading and learning center of several ancient African empires. How would you locate this city if it is not exactly at the intersection of a latitude and longitude line?
The city of Timbuktu is located by estimating where a place is in relation to the grid lines that do appear on the map. Timbuktu's location is 17 N, 3 W. In order to find Timbuktu on the map of western Africa, you might think to yourself . . .
B. Now the longitude, which is 3 W. That is just a little to the west (left) of the Prime Meridian (0). So I will draw a meridian of longitude a little less than 1/3 the way from the Prime Meridian (0) to the 15 W line. I only need to draw this longitude line where it crosses the latitude line I drew before.
C. Timbuktu should be located very close to the intersection of the two lines I drew. There it is, just north of the Niger River in the country of Mali.
??? Use the map above for this exercise. First use your pencil and ruler to draw in the latitude and longitude lines for the locations listed below. Write in the city that is located at the intersection of the lines you have drawn.
??? After a little practice, you can estimate where the line would be without drawing it. Use the world map and write the name of the city or the country in the space provided.
Sometimes you know where a city is located, but you want to be able to tell someone else how to find it on a map. You can do this by telling them the latitude and longitude of the place. You can use the following procedure to report the approximate locations of places.
Imagine that you need to report the latitude and longitude location of Lagos, Nigeria.
A. Here is Lagos . . . I want to estimate the latitude first. Lagos is about 2/3 of the way from the Equator (0) to the 10N latitude line. I estimate it to be about 7 N.
B. Now for longitude. Lagos is about 1/3 the way from the Prime Meridian (0) to 15 E longitude line. I figure that is about 5 E.
C. My estimate is that Lagos, Nigeria is located at about 7 N, 5 E.
??? Use the Africa map above to locate the listed cities, and write the latitude and longitude in the space provided.
??? Use the world map to locate the listed cities, and write the latitude and longitude in the space provided.
The latitude and longitude information listed below can be found on Cram's Explorer World wall maps in the central Atlantic Ocean area;
EQUATOR: (0 latitude) is half way between the North and South poles.
There are five latitude and longitude location examples shown on the
main map. The
The island examples are;
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